Can a UPS keep a router and modem running during a power outage?

Yes. Because routers and modems use very little electricity, a UPS battery backup can often keep them running for 30 minutes to several hours depending on the UPS size and load.

How much UPS capacity do you need for a router and modem?

Most home networking equipment uses between 20 and 40 watts. Even a small 600VA UPS is usually enough to provide meaningful backup runtime.

Is a UPS worth it for home internet?

A UPS can prevent internet outages caused by brief power flickers and can keep your network running during short power outages, making it a practical upgrade for many homes.

Tag: battery backup

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Portable Power Station vs. Generator for a Power Outage: Which Should You Buy?

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If you are buying backup power for a home outage, the easiest mistake is to compare the biggest watt numbers on the boxes.

A 2,200-watt portable power station and a 2,200-watt generator sound as though they should do roughly the same job. They do not.

A portable power station stores a finite amount of electricity in a battery. A generator converts fuel into electricity while it is running. The battery is quiet, simple to use and produces no combustion exhaust. The generator requires fuel, maintenance and a safe outdoor operating location, but it can keep producing electricity long after a battery of similar price and size has been emptied.

That leads to the question that actually matters:

What do you need to keep running, for how long, and do you have a safe place to operate a generator?

For an apartment, a shorter outage or a refrigerator plus electronics overnight, I would often rather have a portable power station. For a multi-day outage, a well pump, substantial 240V loads or much more of the house, a generator becomes considerably harder to replace.

For some homeowners, the best answer is not battery or generator. It is both.

Portable Power Station vs. Generator: The Short Answer

Situation	Usually the Better Choice
Apartment or condo	Portable power station
Outage lasting a few hours	Portable power station
Quiet overnight backup	Portable power station
Refrigerator, lights, phones and internet equipment	Usually portable power station
CPAP and modest overnight loads	Usually portable power station
Multi-day outage	Usually generator
No safe outdoor generator location	Portable power station
Need to replenish power quickly during a long outage	Generator
Large 120V or 240V household loads	Larger generator or substantially larger battery system
Selected house circuits through transfer equipment	Large generator or purpose-built home battery system
Want quiet power plus long-duration backup	Battery + generator

Watts and Watt-Hours Are Not the Same Thing

This is the key to understanding the entire comparison.

Watts measure how much power a device is using or a power source can deliver at a particular moment.

Watt-hours measure energy over time. On a battery, watt-hours tell you roughly how much electricity is stored.

The Jackery Explorer 2000 v2, for example, stores 2,042Wh and can deliver up to 2,200W of continuous AC output.

The Honda EU2200i has a remarkably similar maximum output number: 2,200W, with 1,800W rated continuous output.

Yet the Jackery contains a little over 2kWh of stored electricity. Once that energy is gone, it must be recharged.

The Honda does not have a comparable fixed energy capacity. It produces electricity by burning gasoline. When its tank is empty, the engine can be shut down, allowed to cool and safely refueled. With additional fuel available, it can continue producing electricity.

So two products with “2200 watts” prominently attached to their names can behave very differently during the second or third day of an outage.

How Long Does a 2kWh Portable Power Station Last?

A useful first estimate is:

usable battery energy ÷ average load = approximate runtime

You should not simply divide the advertised battery capacity by the appliance wattage and assume every stored watt-hour reaches the appliance. The inverter, electronics and battery-management system consume some energy, and efficiency changes with the load.

For rough outage planning, suppose we use a conservative 85% usable-AC assumption for a 2,042Wh battery. That leaves about 1,736Wh available to the connected AC loads.

Average Load	Approximate Runtime at 1,736Wh Usable
50W	About 35 hours
100W	About 17 hours
200W	About 8.7 hours
500W	About 3.5 hours
1,000W	About 1.7 hours

Those are planning examples, not manufacturer runtime guarantees. Real appliances cycle on and off, inverter efficiency varies, batteries behave differently with temperature and load, and startup surges can matter even when average consumption is modest.

A refrigerator illustrates the problem nicely. Its compressor may draw substantially more power when running than the refrigerator averages over an entire day. If the compressor runs only part of the time, estimating runtime from its maximum running wattage can be far too pessimistic.

If an appliance matters enough that you are buying backup power specifically for it, measuring its actual consumption is much better than relying on a generic internet wattage chart.

Where a Portable Power Station Wins

It does not produce combustion exhaust

A battery power station does not burn gasoline or propane. That eliminates the carbon-monoxide problem created by an engine-driven generator.

Portable power stations can generally be used inside when operated according to the manufacturer’s instructions, including their temperature, moisture, clearance and ventilation requirements. They are still large lithium-battery systems and should be treated as electrical equipment, not as indestructible boxes you can leave anywhere.

But from an outage-planning perspective, being able to bring your backup power to the refrigerator, bedroom or network equipment without running a combustion engine is an enormous advantage.

It is much quieter

A portable power station may run cooling fans, particularly at higher loads or while charging, but it does not have an engine running outside all night.

That makes batteries particularly attractive for overnight refrigeration, internet equipment, lights, phones, laptops, CPAP machines and other moderate loads.

It starts instantly

If the battery is charged, there is very little outage-day setup. Plug in the equipment you need and turn on the appropriate output.

There is no gasoline to pour, oil level to check, engine to start or outdoor extension-cord route to establish after the lights have already gone out.

It may be the only realistic choice in an apartment

If you live in an apartment, condominium or dense urban setting without an appropriate outdoor location, a combustion generator may not be a practical option at all.

A power station gives renters and apartment owners access to a meaningful amount of backup electricity without needing a yard or generator installation.

Two 2kWh Portable Power Stations I Would Consider

For meaningful home-outage backup, I find the roughly 2kWh class much more interesting than the small camping batteries often marketed as emergency power.

Two current models illustrate different approaches particularly well.

Jackery Explorer 2000 v2: The Simpler, Lighter 2kWh Option

The Jackery Explorer 2000 v2 packs just over 2kWh into a surprisingly manageable package.

2,042Wh LiFePO4 battery
2,200W rated AC output
4,400W instantaneous peak output
Three AC outlets
39.5 lb
Up to 400W DC/solar input
100W USB-C output plus additional USB outputs
Jackery rates the battery for 4,000 cycles to at least 70% remaining capacity

Its biggest advantage is portability for the capacity. At 39.5 pounds, it is not something I would want to carry casually all day, but it is still a one-person lift for many buyers.

Its biggest limitation is equally clear: the Explorer 2000 v2 does not support expansion batteries. The capacity you buy is the capacity you have.

That is not necessarily a problem. If the goal is a straightforward battery that can move between a refrigerator, electronics, camping trips and emergency use, the lack of a larger battery ecosystem may not matter.

I would choose the Jackery if: I wanted a relatively light, straightforward 2kWh unit and did not expect to expand it into a larger battery system later.

Check the current Jackery Explorer 2000 v2 price on Amazon

Anker SOLIX C2000 Gen 2: Better If You Might Expand

The Anker SOLIX C2000 Gen 2 begins with almost exactly the same battery capacity but takes a more expandable approach.

2,048Wh LiFePO4 battery
2,400W continuous AC output
4,000W peak output
41.7 lb
Up to 800W solar input
TT-30 outlet in addition to standard AC outlets
10ms specified UPS transfer time
Expansion with one 2,048Wh BP2000 Gen 2 battery for roughly 4kWh total capacity
Anker rates the battery for 4,000 cycles

The solar input is especially interesting for the backup-power use case. An 800W input ceiling does not mean you will collect 800W from panels all day, but it gives you considerably more potential replenishment than a 400W input limit when sunlight and panel conditions cooperate.

The expansion port also changes the long-term decision. You can start with about 2kWh and later add another roughly 2kWh without replacing the original unit.

Expansion increases stored energy, not the inverter’s continuous output. A larger battery lets a given load run longer; it does not magically turn a 2,400W power station into a 5,000W power source.

I would choose the Anker if: I wanted a 2kWh unit now but cared about expansion, faster solar replenishment or RV-style connectivity later.

Check the current Anker SOLIX C2000 Gen 2 price on Amazon

Where a Generator Wins

The outage lasts longer than the battery

This is the central generator advantage.

A 2kWh battery may be excellent for an evening, overnight or carefully managed collection of critical loads. But if the grid is still down after the stored energy is gone, you need a way to put energy back into it.

That might be utility power, solar panels, a vehicle charging system or another battery.

Or it can be a generator.

With an adequate fuel supply, a generator can continue producing electricity through an outage that lasts for days. You still have to store fuel safely, maintain the engine and refuel according to the manufacturer’s instructions, but total energy is no longer limited to whatever was inside a battery when the outage began.

You have larger loads

A 2,200W or 2,400W battery power station can run considerably more than a phone charger and a lamp. But there is a large gap between “power several important appliances” and “power a significant portion of an electrically demanding house.”

Central air conditioning, large well pumps, electric water heaters, electric cooking equipment, electric dryers and combinations of major appliances can quickly overwhelm a small portable battery.

A larger generator can supply several times as much continuous power.

You need 240V

This is an important limit that is easy to miss when people shop only by wattage.

The Jackery Explorer 2000 v2 and Anker SOLIX C2000 Gen 2 discussed here are 120V portable power stations. Some household equipment requires 240V.

The Westinghouse generator farther down this article provides 120/240V output. That moves it into a very different home-backup class.

Honda EU2200i: What a Small Generator Does Better

The Honda EU2200i is useful in this comparison because its maximum watt rating is almost identical to the Jackery’s continuous output.

1,800W rated output
2,200W maximum output
120V inverter generator
0.95-gallon gasoline tank
Honda rates runtime at about 3.2 hours at rated load
Honda rates runtime at about 8.1 hours at one-quarter load
47.4 lb dry weight
48 to 57 dB(A), depending on load
CO-MINDER carbon-monoxide monitoring/shutoff system

Notice what is strange about that comparison.

The Jackery actually has a higher continuous output rating: 2,200W versus the Honda’s 1,800W.

But the Honda can produce far more total energy during a long outage because you can supply additional gasoline. A second gallon of fuel extends the useful life of the generator. There is no equivalent way to pour another kilowatt-hour into an empty non-expandable Jackery.

This is why watt ratings alone are such a poor way to decide between batteries and generators.

I would choose the Honda if: my loads were modest but the outage could last long enough that a 2kWh battery would clearly be insufficient.

Check the current Honda EU2200i price on Amazon

Westinghouse iGen12000DFc: A Completely Different Class of Backup Power

The Westinghouse iGen12000DFc is deliberately not a close competitor to the two 2kWh batteries above.

It shows what happens when the goal changes from powering a collection of essentials to supplying serious household backup power.

9,000W running / 12,000W peak on gasoline
8,100W running / 11,000W peak on propane
120/240V output
Dual-fuel gasoline and propane operation
7.9-gallon gasoline tank
Up to 19 hours at 25% load on gasoline, according to Westinghouse
About 11 hours at 50% load on gasoline
About 9 hours at 25% load on a 20 lb propane tank
About 5 hours at 50% load on a 20 lb propane tank
Less than or equal to 3% total harmonic distortion
120/240V 50A and 30A outlets suitable for properly configured transfer equipment
CO sensor with automatic shutdown
Electric, remote and recoil starting
189 lb dry weight

This is not something you casually carry to the refrigerator. At nearly 190 pounds before fuel, it is portable in the generator sense: it has wheels and can be moved into position. It is not portable in the same sense as a 40-pound battery.

What you gain is a radically larger power envelope.

At 9,000 running watts on gasoline, the iGen12000DFc can potentially support combinations of household loads that make little sense on a 2,000Wh portable battery. Its 240V capability also opens the door to equipment the Jackery and Anker examples here cannot directly power.

That does not mean every house can simply plug in and run normally. Whether a generator can support your home depends on the actual loads, their startup requirements, how circuits are connected and what is running simultaneously.

I would choose a generator in this class if: I wanted to move beyond extension-cord backup for a few appliances and toward substantial selected-circuit home backup, with the electrical connection designed correctly for the house.

Check the current Westinghouse iGen12000DFc price on Amazon

Portable Generator Safety Is a Major Part of the Buying Decision

A generator’s long runtime is extremely useful. The tradeoff is that you are operating a combustion engine during an emergency.

Carbon monoxide is the most important danger.

The U.S. Consumer Product Safety Commission’s current guidance says portable generators should be operated outside only, at least 20 feet from homes and buildings, with the exhaust directed away from windows, doors and vents.

Do not run a generator in a house, basement, shed, crawlspace or garage. An open garage door does not make an attached garage a safe generator location.

The CPSC also recommends working carbon-monoxide alarms on every level of the home and outside sleeping areas.

You can read the agency’s current guidance here: CPSC generator and carbon-monoxide safety guidance.

Both generators in this article have automatic CO-monitoring shutdown systems. Those are valuable safety features. They do not make it safe to operate a generator indoors or too close to a building.

Do Not Backfeed Your House Through a Wall Outlet

A large generator such as the Westinghouse becomes much more useful when it can supply selected household circuits, but this needs to be done correctly.

Do not try to energize your house by connecting a generator to an ordinary wall receptacle with a male-to-male cord. This practice, usually called backfeeding, can create electrocution and fire hazards and can energize utility-side wiring unexpectedly.

The CPSC specifically warned again about these cords in 2026.

If a generator will feed household wiring, use appropriate transfer equipment or an approved interlock arrangement installed for the application. Have a qualified electrician determine what is appropriate for your panel, generator and local code requirements.

That is an additional cost compared with carrying a battery to an appliance, but it also creates a much more useful home-backup system.

What About a Refrigerator?

A refrigerator is one of the most compelling uses for a 2kWh portable power station.

Food preservation matters during an outage, but refrigerators do not necessarily consume their full running wattage continuously. The compressor cycles.

A battery therefore may provide much more useful refrigerator time than you would guess from looking only at a compressor’s running wattage.

The catch is startup surge. Compressors can briefly demand substantially more power when they start.

Before assuming any battery will run your refrigerator, check the actual appliance and ideally measure its consumption. The same principle applies to freezers.

What About a Sump Pump?

Sump pumps are another attractive outage load, but they are more demanding than their normal running wattage can suggest.

The motor may require a sizable startup surge each time the pump starts. A pump that appears to fit comfortably within a power station’s continuous output can still exceed its surge capability.

Runtime also depends on something you cannot know from the pump’s wattage alone: how often it has to run. During a major storm, that may be much more often than during normal weather.

If a sump pump is the reason you are buying backup power, size around the actual pump and a reasonably bad water-inflow scenario rather than an average day.

What About a Well Pump?

Well pumps deserve extra scrutiny because many are 240V loads.

If your well pump requires 240V, neither the Jackery Explorer 2000 v2 nor the Anker SOLIX C2000 Gen 2 in this article can directly power it from their 120V AC outputs.

A 120/240V generator such as the Westinghouse may be a much more natural fit, assuming its capacity and the home’s electrical setup are appropriate for the pump.

Can a Portable Power Station Run an Air Conditioner?

Sometimes.

A small window air conditioner is a very different load from a large central-air system. Compressor startup demand matters, and even an air conditioner that a 2kWh battery can successfully start may drain that battery rapidly.

There are portable battery systems much larger than the two examples here, including expandable systems designed around 240V home backup. At that point, however, you are no longer comparing a $1,000-ish portable battery conceptually with a small generator. You are designing a substantially larger energy system.

Electric Space Heating Changes the Math Very Quickly

Resistance heat is one of the fastest ways to empty a portable battery.

A 1,500W space heater running continuously would theoretically consume 1.5kWh every hour before accounting for inverter losses. A 2kWh battery is therefore a poor long-duration substitute for ordinary electric heat.

If winter outage preparation is the goal, consider the power demands of the home’s actual heating system. A gas or oil furnace may need only enough electricity for controls, ignition and a blower, while electric resistance heating can require vastly more energy.

Solar Panels Help, but They Do Not Make a Battery Infinite

The phrase “solar generator” makes this part of the market sound more magical than it is.

A solar panel is a way to put energy back into the battery. Whether it replaces energy as quickly as you consume it depends on panel capacity, weather, season, shade, orientation and the power station’s input limit.

The Jackery Explorer 2000 v2 accepts up to 400W of DC solar input. The Anker SOLIX C2000 Gen 2 accepts up to 800W.

Neither number means you will receive that output continuously from sunrise to sunset.

Imagine your essential loads consume 3kWh per day and your panels produce only 1.5kWh that day. Solar has extended your outage runtime substantially, but the battery is still losing a net 1.5kWh per day.

On a clear day with an appropriately sized array, the equation may look much better. In miserable storm weather, it may look much worse.

This is why foldable solar deserves its own buying decision rather than being treated as a free infinite-fuel attachment to every power station.

Why Battery + Generator May Be the Best Home-Outage Combination

The more I think about backup power, the less I view batteries and generators as natural enemies.

They are good at almost opposite things.

A battery is excellent for:

quiet overnight power
internet and network equipment
refrigerators and freezers
lights
phones and laptops
short interruptions
indoor loads where an outdoor generator would be inconvenient
instant power without starting an engine

A generator is excellent for:

outages lasting days
larger loads
240V equipment when the generator supports it
selected household circuits through properly installed transfer equipment
replenishing batteries when solar or grid charging is unavailable

That creates a surprisingly sensible hybrid system.

You can use the battery during quiet periods and overnight. Run the generator when larger loads need power or when the battery needs to be replenished. Then shut the engine down again instead of listening to it run for hours merely to support a refrigerator, router and a few lights.

This arrangement does cost more because you are buying two forms of backup power. But it also reduces the need to force either one to do a job it is poorly suited to do.

Where a UPS Still Fits

A portable power station does not replace a UPS.

A UPS solves a different problem: maintaining power automatically when electricity disappears for a moment, protecting equipment from interruption and giving electronics time to ride through an outage or shut down properly.

If your concern is keeping a router and modem alive through short outages, see my guide to the best UPS for a router and modem.

For larger home networks, NAS devices, PoE cameras and switches, I have a separate guide to the best UPS for a network closet, NAS and PoE equipment.

A portable power station becomes interesting when the problem has moved beyond “don’t let this reboot” and toward “I want meaningful stored electricity for hours.”

There is one more wrinkle for internet backup: supplying electricity to your modem and router does not guarantee that your ISP’s equipment upstream from your house still has power. I cover that in Will Your Internet Work During a Power Outage?

What I Would Buy for Different Outage Scenarios

Apartment or condo

I would buy a portable power station.

Unless you have an unusually suitable outdoor setup and building rules that permit it, the generator’s exhaust and placement requirements make it a poor fit.

House, mostly worried about short outages

I would start with a roughly 2kWh power station.

For a refrigerator, network equipment, phones, lights and other modest loads, it provides useful backup without turning every outage into a small-engine project.

The Jackery Explorer 2000 v2 would be my simpler choice. The Anker SOLIX C2000 Gen 2 becomes more appealing if expansion or higher solar input matters.

House, modest loads but realistic multi-day outages

I would want a generator.

The Honda EU2200i is compelling if 1,800W of continuous output is enough for the equipment you actually intend to run.

Its advantage is not that it produces more watts than a 2kWh battery. It does not. Its advantage is that additional gasoline provides additional energy.

House, substantial backup through the electrical panel

I would look at a much larger generator or a much larger home-battery system.

The Westinghouse iGen12000DFc is an example of the generator route: 120/240V output, 9,000 running watts on gasoline and connections intended to work with properly designed home transfer equipment.

Before buying something this large, I would identify the circuits and loads I actually expect it to support and have the house connection planned correctly. Buying 12,000 peak watts first and figuring out the electrical system afterward is backwards.

House where outages are both frequent and potentially long

I would seriously consider both battery and generator.

The battery makes the outage much nicer to live through. The generator prevents stored energy from becoming the limiting factor.

My Bottom Line

Do not decide between a portable power station and a generator by comparing the biggest watt number in the product name.

Start by making a list of what actually needs power. Determine whether any of it requires 240V. Pay attention to motor and compressor startup loads. Decide whether you are preparing for two hours, twelve hours or four days.

Then ask where the next unit of energy comes from.

If you need a finite amount of quiet, convenient electricity, a portable power station is often the more pleasant solution.

If you need to keep producing electricity for as long as the utility remains down, a generator retains an enormous advantage.

And if outages matter enough that you want both convenience and endurance, battery plus generator may be the most capable answer of all.

Published on September 10, 2026

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Will Your Internet Work During a Power Outage? Cable, Fiber, Satellite & 5G Explained

Your home internet may keep working during a power outage, but only if your own networking equipment has backup power and your internet provider’s network is still operating.

The first part is relatively easy to solve. Put the right equipment on a UPS and your modem, router, fiber terminal, satellite equipment or cellular gateway can stay powered when the lights go out.

The second part is outside your control. Your internet connection depends on infrastructure beyond your house, and some of that infrastructure may also depend on commercial power. That is why a UPS can keep one home’s internet working perfectly during an outage while another home’s connection disappears even though all of the networking equipment inside the house is still running.

The answer also varies depending on whether you have cable, fiber, satellite or cellular internet.

Does Wi-Fi Work During a Power Outage?

Without backup power, usually not. Your Wi-Fi router needs electricity. When it shuts off, your wireless network disappears with it.

A UPS solves that part of the problem. Keep the router powered and it can continue broadcasting Wi-Fi.

But Wi-Fi and internet access are not the same thing. Wi-Fi is the network connecting devices inside your home. Unlike an old copper telephone that could receive its operating power directly from the phone line, modern internet equipment generally needs local electricity. For your devices to reach the internet, every essential piece of equipment between them and your internet provider also needs to remain powered.

In a typical home that might mean:

Cable internet: cable modem or gateway + Wi-Fi router
Fiber internet: optical network terminal (ONT) + router or gateway
Satellite internet: satellite dish or terminal + router or gateway
Cellular or 5G home internet: cellular gateway or hotspot + any separate router or Wi-Fi equipment
Mesh Wi-Fi: internet equipment + main mesh router + any satellite nodes you actually need
Larger home network: internet equipment + router/firewall + Ethernet or PoE switches + Wi-Fi access points

If one essential device loses power, the connection can stop there.

Why Old Landline Phones Often Worked During a Power Outage

If you grew up with a traditional Bell System-style copper telephone line, you may remember that the phone often continued working even when the electricity in the house went out.

That was possible because traditional analog telephone service, usually called POTS (Plain Old Telephone Service), did not normally depend on power from an outlet in your house. The telephone company supplied low-voltage DC power over the same pair of copper wires that carried the voice signal.

A traditional telephone line was typically powered at roughly 48 volts DC from equipment at the telephone company’s central office. The central office itself was designed with large battery banks and often generators, allowing telephone service to continue through utility outages.

As long as the telephone company’s network remained operating, a simple corded telephone could therefore keep working even if the rest of your house was completely dark.

There was an important exception: cordless phones still required electricity for their base station. During an outage, the phone line might still be working while the cordless phone was useless. This is one reason many households kept a basic corded telephone around for emergencies.

Modern home internet is very different. Cable modems, fiber ONTs, Wi-Fi routers, switches and VoIP phone equipment all contain powered electronics at the customer’s home. If those devices lose electricity, the service usually stops unless you provide battery backup.

In a sense, a UPS for your modem, ONT and router recreates part of what the old telephone network provided automatically: keeping the communications equipment powered even when utility electricity disappears.

Will Cable Internet Work During a Power Outage?

It can, particularly during a short outage.

If you put your cable modem and router on a UPS, they can continue operating after your house loses power. Whether they can still reach the internet depends on the cable company’s network.

Cable networks can have powered equipment outside your home, including nodes, amplifiers and network power supplies. Providers use batteries and generators to keep that infrastructure operating during outages, but backup power is finite and equipment can also be damaged by the storm or other event that caused the blackout.

That leaves several possibilities:

A short outage occurs and your UPS keeps the internet working without interruption.
Your equipment stays powered, but something in the cable network loses power and your connection stops.
The connection works initially and fails later when upstream backup power is exhausted.
The outage also damages the network itself, making backup power irrelevant.

This is why installing a whole-house generator does not necessarily guarantee working cable internet. The generator can power everything inside your house. It cannot power the cable company’s equipment down the street.

Will Fiber Internet Work During a Power Outage?

Fiber can be particularly well suited to staying online during a blackout, but your equipment at home still needs electricity.

Many fiber-to-the-home systems use a Passive Optical Network, or PON. Passive optical splitters can distribute the signal through much of the path between the provider and your house without requiring the chain of powered amplifiers found in some other broadband networks.

That does not make fiber independent of electricity. Your provider still needs its network equipment operating, and your end of the connection needs power too.

The important device in many homes is the Optical Network Terminal, or ONT. It terminates the fiber connection at your house and provides the connection used by your home network.

If the ONT loses power, your fiber internet stops even if the Wi-Fi router is still running.

So if you have fiber, find the ONT and its power supply before deciding what belongs on your UPS.

AT&, for example, says customers with an external ONT need backup power for that equipment as well as their gateway. See AT&’s battery-backup guidance.

Will Satellite Internet Work During a Power Outage?

Satellite internet can continue working during a local power outage if you can keep the equipment at your house powered and the satellite network itself remains available.

This gives satellite an interesting advantage during some emergencies. Your connection is not dependent on a cable running through the neighborhood or the same chain of terrestrial equipment used by a local cable network.

If a storm knocks out neighborhood cable infrastructure while your satellite terminal still has a clear view of the sky, satellite service may remain available.

But the equipment at your house still needs electricity.

For a system such as Starlink, that means the satellite terminal and whatever router or networking equipment you use with it. Traditional satellite systems have the same basic requirement.

This makes backup power especially important for someone who relies on satellite internet at a rural property, vacation home or other location where outages may last longer than they do in a dense urban area.

Satellite Internet Can Require More Battery Capacity

There is one important consideration when comparing satellite with cable or fiber: a satellite terminal may consume more electricity than a simple cable modem or fiber ONT.

That affects runtime.

A UPS that can keep a low-power modem and router operating for a long time may run down considerably faster when powering satellite equipment.

If satellite internet is important during a long outage, I would pay close attention to the actual wattage of the equipment and the battery capacity available. A conventional UPS may still be useful for short interruptions, while a larger battery or generator becomes more attractive when outages routinely last for hours.

Will Cellular or 5G Home Internet Work During a Power Outage?

Often, yes, provided both your cellular gateway and the carrier’s network remain operating.

If you use T-Mobile, Verizon or another fixed-wireless home internet service, your gateway still needs electricity. Put it on a UPS or another battery source and it may continue providing internet even though utility power to your house has failed.

Cellular internet can also be useful during an outage because it provides a completely different path to the internet than your cable or fiber connection.

But cell towers and the networks behind them need power too. Carriers use batteries and generators at many sites, but backup power can eventually run out and physical damage can still take equipment offline.

There is another problem during widespread outages: congestion.

If cable and fiber connections fail across a neighborhood, large numbers of people suddenly move onto cellular networks. A cellular connection that is normally fast can become much slower just when everyone needs it.

Cellular Home Internet Can Be Easy to Back Up

One advantage of cellular home internet is that the equipment can be quite simple. A 5G gateway may combine the cellular modem, router and Wi-Fi access point in a single device.

In that case, you may only need to keep one device powered.

If you use a separate router, mesh system, Ethernet switch or access point, those devices also need backup power if you want to continue using them.

Your Phone Is Already a Battery-Powered Internet Connection

A smartphone has its own battery, which makes it one of the easiest emergency internet connections available.

If the cellular network is still operating, a phone may continue working even when every piece of networking equipment in your house is off.

You can also use the phone as a hotspot for a laptop or another device.

The limitations are battery life, signal strength, data-plan restrictions and network congestion. For occasional emergencies, that may be enough. If internet access is critical, a dedicated cellular connection or automatic cellular failover system is more robust.

A Fios Backup Battery May Not Back Up Your Internet

There is another easy mistake to make: seeing a battery installed by your internet provider and assuming it keeps everything running.

That is not necessarily what it was designed to do.

Verizon’s documentation for its traditional Fios Digital Voice battery backup says that backup power is intended for voice service rather than internet or television service.

See Verizon’s Fios battery-backup documentation.

If you want internet access during an outage, verify exactly what an existing provider-installed battery powers. You may still need your own UPS for the ONT, router and other network equipment.

What Internet Equipment Should You Put on a UPS?

Start at the internet connection coming into your house and follow the path to the devices you actually need.

For a simple cable setup, that usually means:

cable modem or gateway
Wi-Fi router, if it is separate

For fiber:

ONT and its power supply
router or ISP gateway

For satellite:

satellite terminal or dish power supply
router or gateway

For cellular home internet:

cellular gateway
any separate router, switch or Wi-Fi equipment you need

A larger home network may also require:

Ethernet switch
PoE switch
Wi-Fi access points
mesh Wi-Fi nodes
firewall or router appliance

You probably do not need every piece of network equipment running during a blackout. Every additional device consumes battery capacity.

For a simple network, see my guide to the best UPS battery backups for routers and modems.

If your network has grown into a rack or closet full of switches, access points, cameras and storage, I have a separate guide to choosing a UPS for a network closet, NAS, PoE switches and cameras.

Do You Need to Keep Your NAS Running?

Not necessarily.

I run both networking equipment and a NAS on backup power, but their priorities are different during a long outage.

The UPS gives a NAS time to ride through a brief interruption or shut down safely. If the outage is going to last for hours, keeping storage running may consume battery capacity that would be more useful keeping the router, ONT and Wi-Fi alive.

Ideally, a larger home network can shut down nonessential equipment while leaving the low-power networking devices running. With systems like a NAS, it is best to let them shut down gracefully than to abruptly stop.

That can turn a relatively modest UPS into a surprisingly useful source of internet runtime.

How Long Can a UPS Keep Your Internet Running?

Networking equipment is a good candidate for battery backup because its power consumption can be relatively low.

A modem, router and fiber ONT may together consume only a few dozen watts. Start adding switches, multiple access points, PoE cameras, a NAS or satellite equipment and the load can rise quickly.

This is why the VA number printed on a UPS does not tell you how long your internet will run. Runtime depends heavily on the actual wattage of the devices connected to it and the battery capacity of the UPS.

A UPS that provides only a short runtime for a desktop PC may be able to run a modem and router much longer.

If runtime matters, measure or estimate the equipment you actually intend to keep running rather than sizing the UPS around everything that happens to be plugged in nearby.

A UPS Helps Even If Your Outages Are Short

There is another benefit that has nothing to do with surviving an all-day blackout.

A very short power interruption can reboot your modem, router, switches and access points. Power may return almost immediately while you spend the next several minutes waiting for the network to reconnect.

A UPS prevents that.

For homes with reasonably reliable utility service, this may be the most common benefit. The UPS quietly handles flickers and short outages without the network going down at all.

The worse the power reliability at the equipment’s location, the more runtime becomes important. A house that sees an occasional five-minute outage has very different backup-power needs from a remote property that can lose power for several hours.

What Happens During a Long Power Outage?

Eventually a conventional UPS reaches its limit.

During a long outage, several things can end your connection:

your UPS battery runs out
your ISP’s backup power runs out
outside network equipment fails
storm damage interrupts the physical connection
cellular networks become congested

If outages where you live are regularly measured in hours rather than minutes, the next step is larger-scale backup power.

That might mean a portable power station, whole-house battery or generator.

These systems can keep your equipment operating far longer than a normal UPS. They still cannot guarantee that your internet provider remains online, but they solve the problem of running out of power inside the house.

Using Cellular as a Backup Internet Connection

Even if cellular is not your primary internet service, it can provide a valuable second path when cable, fiber or satellite service fails.

The simplest backup is the hotspot built into your phone.

More sophisticated home networks can automatically switch to a dedicated cellular connection when the primary ISP goes down.

Some providers also sell cellular failover services. These can protect against an ISP outage as well as a power outage, provided the cellular network remains available and the backup equipment itself has power.

I would treat cellular as another layer of resilience rather than a guarantee. During a widespread outage, cellular networks can become congested as thousands of people shift traffic onto them at the same time.

How to Test Whether Your Internet Will Work During an Outage

You do not have to wait for the next storm to test half of the system.

If your network is already connected to a UPS, safely disconnect the UPS from wall power and confirm that everything required for internet access stays online.

Check the modem, ONT, satellite terminal or cellular gateway as appropriate, along with the router and any switch or access point you need.

If the internet continues working, you have verified that your equipment and UPS are configured correctly.

The next real neighborhood outage tests the other half: your provider.

If all of your equipment remains powered and the internet still works, you know the provider’s local infrastructure survived that outage.

If your network stays powered but the internet connection disappears, check the ISP’s outage information. The failure may be upstream from your house.

This is worth learning before spending thousands of dollars on larger backup-power equipment under the assumption that powering the house automatically keeps the internet online.

What I Would Do If Internet During an Outage Matters

I would build backup connectivity in layers:

Put the modem, ONT, satellite terminal or cellular gateway and router on backup power.
Back up any switch or Wi-Fi access point you actually need.
Leave unnecessary high-draw equipment off the battery during a long outage.
Measure how long your network actually runs from the UPS.
See how your ISP behaves during a real local outage.
Keep a phone hotspot or other cellular option available.
If long outages are common, consider a larger battery system or generator.

This is particularly useful at a second home or other property you monitor remotely. Keeping the internet connection alive may also keep security cameras, leak sensors, thermostats and other connected devices reachable when the property loses utility power.

So, Will Your Internet Work When the Power Goes Out?

It may, and relatively inexpensive backup power can dramatically improve the odds during a short outage.

You need to keep every essential piece of networking equipment powered. For cable, that generally means the modem and router. For fiber, remember the ONT. Satellite users need to power the satellite equipment, while cellular users need to keep their gateway running.

After that, the provider’s network becomes the limiting factor.

If the network outside your house remains online, your own backup power may keep you connected long after everything else in the house goes dark. If the provider loses upstream infrastructure, no UPS inside your house can restore that connection.

For most homes, I would start with the inexpensive part of the problem: keep the essential networking equipment on battery backup. It prevents nuisance reboots during short outages and gives you a good chance of staying online during longer ones when your provider remains available.

To choose the right size, start with my guide to UPS battery backups for routers and modems.

Published on August 18, 2026

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Best UPS for a Home Network Closet: NAS, PoE, Cameras and Wi-Fi

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A modem and Wi-Fi router are easy to protect with a UPS. A full home network closet is a different problem.

Once you add switches, wireless access points, PoE cameras, a NAS, a firewall, smart-home hubs and other equipment, you have more power draw, more devices that need to shut down cleanly and more reasons to care about what happens when the power stays out for longer than five minutes.

I use UPS units for both my networking gear and my NAS. My current NAS runs TrueNAS on a low-power Intel N100-based system, so it does not require a giant UPS by itself. But the NAS is only one part of the load. The router, switches, access points and other network equipment all need power too.

I have also had both sides of the UPS problem: an unsafe shutdown after losing power and a UPS battery that failed when I expected it to protect the equipment. Those experiences changed how I think about sizing a UPS. Capacity matters, but so do battery condition, monitoring, graceful shutdown and the reliability of the power where the equipment actually lives.

Quick answer: For a home network closet with a NAS, PoE switch and several other devices, a good starting point is looking at a 1500VA-class UPS with sine-wave output, USB or network monitoring and replaceable batteries. The CyberPower CP1500PFCLCD is the value choice I would consider first. For a NAS or server setup where management and expandability matter more, I would step up to the APC SMT1500C or Eaton 5P1500.

UPS	Capacity	Best For	My Take	Check Price
CyberPower CP1500PFCLCD	1500VA / 1000W	Most home network closets	Best value	Check price
APC Back-UPS Pro BR1500MS2	1500VA / 900W	Large home networks without server-class needs	Good bridge between consumer and network-closet UPS units	Check price
APC Smart-UPS SMT1500C	1440VA / 1000W	NAS, servers and serious network closets	My step-up APC choice	Check price
Eaton 5P1500	1440VA / 1100W	Premium network and server setups	Excellent management-oriented option	Check price
APC Smart-UPS SMT1500RM2UC	1440VA / 1000W	Rack-mounted network closets	Best fit if the rest of the equipment is already in a rack	Check price

When a Router UPS Is No Longer Enough

I have a separate guide to the best UPS for a router and modem. If your entire critical load is an ONT or cable modem, router and perhaps one small switch, start there. You probably do not need the equipment in this article.

A network closet becomes a different problem when it contains things like:

A modem or fiber ONT
A router or dedicated firewall
One or more Ethernet switches
A PoE switch
Multiple Wi-Fi access points
Security cameras
An NVR
A NAS
A small home server
Home Assistant or other automation hardware
Smart-home bridges

At that point I care less about finding the smallest UPS that can technically support the equipment and more about building enough margin into the system that it remains useful as the network changes. Also, remember not every device needs to have redundant power.

Start With Watts, Not VA

Measure the actual network load instead of guessing using a smart plug or similar device. Knowing whether the closet uses 90 watts or 350 watts completely changes your considerations.

UPS marketing leads with VA ratings, but the watt rating is just as important. A UPS can be rated at 1500VA and still support a different maximum number of watts than another 1500VA model.

That is visible in the products above. The APC Back-UPS Pro BR1500MS2 is rated for 900 watts, the CyberPower CP1500PFCLCD and APC Smart-UPS models here are rated for 1000 watts, and the Eaton 5P1500 is rated for 1100 watts.

You do not want to add the wattage printed on every power adapter and assume that is your actual load. Those labels generally describe what the power supply can provide, not necessarily what the device consumes continuously.

Measure the whole network closet

If everything is already connected to one UPS, the UPS display may show current load. You can also use a plug-in power meter between the wall and the equipment while temporarily running it without the UPS.

Measure during normal operation and then consider what changes under load. A NAS may draw more power while its disks are active. A PoE switch may consume considerably more as additional cameras and access points draw power.

I would also leave room for the next device. Home networks have a habit of growing.

PoE Makes UPS Sizing More Interesting

A normal Ethernet switch has a relatively predictable load. A PoE switch is powering other equipment through the network cable, so the switch itself is only part of the calculation.

If the switch powers cameras, wireless access points, phones or other PoE devices, that downstream load is also being supplied by the UPS.

This is one reason backing up the switch can be so useful. One UPS connection may keep an entire group of cameras and access points online. It also means that adding another six PoE cameras later can materially change the amount of battery runtime you have.

When sizing the UPS, look at actual PoE consumption rather than simply the switch’s maximum advertised PoE budget. Then leave enough capacity for growth.

A NAS Changes What I Want From a UPS

A router reboot is annoying. An abrupt NAS shutdown is something I work harder to avoid.

A NAS may be writing data, updating filesystem metadata or running applications when utility power disappears. The goal of the UPS is therefore not necessarily to run the NAS for hours. It may be to keep the machine alive long enough for the outage to prove that it is not a momentary flicker and then shut the system down cleanly.

This is why I consider communications support essential when a NAS or server is part of the load.

TrueNAS and NUT

TrueNAS includes UPS support using Network UPS Tools, commonly called NUT. A compatible UPS can communicate with the NAS over USB, serial or, with suitable hardware, over the network.

TrueNAS can then react to UPS status and initiate a controlled shutdown rather than waiting for the battery to become completely exhausted.

The exact UPS and driver still matter. If automatic shutdown is important to you, check the current TrueNAS UPS documentation and the Network UPS Tools compatibility information before buying.

TrueNAS can also operate with one system acting as the UPS monitor while other systems receive status across the network. That is useful when several servers share one sufficiently large UPS.

If you are interested in the NAS side of my setup, I have an entire Building My NAS series covering the hardware and software decisions.

How Much Runtime Do You Actually Need?

This is where I think a lot of UPS recommendations go wrong. The correct size depends on the power where the equipment is located.

A network closet in a city apartment with an occasional one-second flicker has a very different problem from equipment sitting unattended at a vacation house where an outage might last six hours.

If your problem is brief flickers

Your main goal is continuity. You want the modem, router, switches and NAS to ignore a brief voltage drop that would otherwise reboot everything.

Runtime is secondary. Even a modest amount of battery capacity may be enough, although I still prefer reasonable headroom rather than running a UPS near its maximum load.

If you get occasional short outages

Now runtime becomes useful. If most outages last five or ten minutes, I want the network to stay up rather than immediately begin shutting things down.

A 1500VA-class unit becomes attractive because a network closet usually draws far less than the UPS’s maximum watt rating, allowing more runtime than it would provide to a heavily loaded desktop computer.

If outages are frequent

Battery wear and monitoring become more important. Every battery discharge uses part of the battery’s useful life.

This is also where Automatic Voltage Regulation is valuable. A line-interactive UPS with AVR can correct certain voltage variations without moving to battery every time the incoming voltage wanders outside its preferred range.

For a deeper look at AVR, waveform, communications and other UPS features, see How to Choose a UPS With the Right Features.

If long outages are common

A larger UPS may delay the shutdown, but eventually this stops being primarily a UPS-sizing problem.

If the power regularly disappears for hours, you may need a generator, a much larger battery system or another backup-power strategy. The UPS can bridge the gap, protect the equipment from short disturbances and give servers time to shut down properly.

If the network is at a remote or vacation property

This is the case where monitoring becomes especially valuable.

If nobody is there to hear the UPS beeping, I want some way to know that the property lost power and that the battery is being depleted.

There is another limitation: keeping your router alive does not guarantee that your internet service remains alive. Your cable company, fiber provider or other ISP has equipment upstream from your house. A neighborhood-wide outage may eventually take that infrastructure offline too.

If remote connectivity is important enough, consider cellular failover as a separate layer.

I discuss the rest of that problem in my guide to vacation-home remote monitoring.

Best Value: CyberPower CP1500PFCLCD

For many home network closets, the CyberPower CP1500PFCLCD is where I would start.

It provides 1500VA/1000W capacity, sine-wave output, Automatic Voltage Regulation, 12 outlets and USB communications. CyberPower also supports optional network management for the model.

That is a lot of capability for a home network, NAS and PoE setup without moving all the way into enterprise UPS pricing.

I would buy it for: a serious home network closet where value matters and USB shutdown is sufficient.

Check the CyberPower CP1500PFCLCD on Amazon

Best Consumer Step-Up: APC Back-UPS Pro BR1500MS2

The APC BR1500MS2 sits between the small consumer UPS and the more IT-oriented Smart-UPS line.

It is rated at 1500VA/900W, has 10 outlets, AVR, an LCD and a user-replaceable battery.

If your closet is mostly networking gear with perhaps a low-power NAS, this may be enough. If I were protecting a more substantial server or knew I wanted network-management options, I would move up to the Smart-UPS or Eaton choices below.

I would buy it for: a large home network that has outgrown a basic router UPS but does not need the management features of a higher-end unit.

Check the APC BR1500MS2 on Amazon

Best APC for a NAS or Server: APC Smart-UPS SMT1500C

The APC SMT1500C is where the product starts to feel more like network infrastructure.

It is a 1440VA/1000W line-interactive sine-wave UPS with eight outlets, AVR, a replaceable battery, USB/serial shutdown support, a SmartConnect Ethernet port and a SmartSlot for additional management options.

The difference is not simply another hundred watts. I am paying for a platform designed around servers, storage and network closets.

I would buy it for: a NAS or server I care about enough to justify spending more for management, monitoring and a more IT-oriented UPS platform.

Check the APC SMT1500C on Amazon

Premium Tower Choice: Eaton 5P1500

The Eaton 5P1500 is the premium tower option in this group.

It is rated at 1440VA/1100W, has eight outlets and true sine-wave output. Eaton includes USB and serial connectivity, with an optional network card for remote management.

The higher watt rating also gives a little more room for equipment growth, although runtime still depends on the actual load.

I would buy it for: a serious home lab or network closet where management, build quality and server-oriented features justify the higher cost.

Check the Eaton 5P1500 on Amazon

Best Rackmount Choice: APC SMT1500RM2UC

If the network already lives in a rack, the APC SMT1500RM2UC is the cleanest choice here.

It is a 2U rackmount Smart-UPS rated at 1440VA/1000W with six outlets, sine-wave output, AVR, SmartConnect, SmartSlot expansion and USB or serial shutdown support.

The advantage is organizational as much as electrical. Instead of putting a heavy tower on the floor or a shelf beside the rack, the UPS becomes part of the rack itself.

Remember that a rackmount UPS is heavy. Install it low in the rack and make sure the rack and mounting hardware are designed to support it.

I would buy it for: a permanent rack-mounted network installation where clean organization and IT-style management matter.

Check the APC SMT1500RM2UC on Amazon

Tower vs. Rackmount UPS

Choose a Tower UPS If…	Choose a Rackmount UPS If…
Your network equipment sits on shelves	You already have a standard equipment rack
You want the lowest cost for the capacity	You want the UPS integrated neatly into the rack
You may move the UPS between locations	The installation is relatively permanent
Rack space is limited	Floor and shelf space are limited
You do not need rack-oriented cable management	You want UPS and PDU wiring contained in the rack

Do not buy rackmount simply because it looks more professional. Tower units generally give a home user more flexibility and often better value.

Should You Use a Rack PDU?

A rack PDU can make sense when the UPS does not provide enough conveniently located receptacles for all the low-power equipment in a rack.

A proper PDU is a power-distribution device, not another UPS. Eaton specifically describes a UPS feeding a PDU as a normal basic network-closet architecture, and APC also distinguishes rack PDUs from ordinary surge strips.

Do not solve an outlet shortage by daisy-chaining UPS units. Do not casually add a household surge strip or extension cord to the output either. UPS manufacturers have specific requirements for what can be connected to their equipment.

If you need more outlets, check the UPS manufacturer’s guidance and use an appropriately rated PDU intended for the application.

Do You Need Pure Sine Wave?

For a simple modem and router, I would not make waveform the only buying criterion.

Once a NAS, server or other equipment with an active-PFC power supply is involved, I prefer a sine-wave UPS. It removes a compatibility question and is already standard on the CyberPower CP1500PFCLCD, APC Smart-UPS models and Eaton 5P1500 covered here.

This is one of those features where I would rather buy it once than diagnose a strange shutdown later.

Battery Replacement Matters More Than the UPS Brand Name

A UPS is not a permanent appliance. Its battery is a consumable.

I learned this the irritating way when equipment protected by a UPS went down even though there had not been an obvious outage. The UPS was still sitting there doing its job in theory. The battery was no longer capable of doing its job in practice.

I wrote about that experience in UPS Batteries May Only Last 2–3 Years — And They Usually Fail Without Warning.

For a network closet, I would:

Buy a UPS with replaceable batteries
Write the battery installation date on the UPS
Enable battery and self-test alerts
Check reported battery condition periodically
Test whether the UPS can actually carry the network load
Replace a weak battery before an outage exposes the problem

A UPS showing a green light is not the same thing as a UPS with a healthy battery.

What Should Be on Battery Backup?

Prioritize the equipment that either keeps connectivity alive or needs an orderly shutdown.

For my network closet, the battery-backed side would include:

ONT or modem
Router or firewall
Core network switch
PoE switch if it powers critical cameras or access points
NAS
Essential Wi-Fi access points
Home-automation controller
Critical monitoring gateways

I would be much less interested in using battery capacity for:

Monitors that do not need to stay on
Printers
Speakers
Decorative lighting
Chargers that can wait
Nonessential lab equipment

What Should Never Be Connected to a Normal Network UPS?

A UPS designed for computers and networking equipment should not become a general emergency outlet.

High-draw heating and motor loads can quickly overload it. I would not connect things such as:

Laser printers
Space heaters
Vacuum cleaners
Refrigerators or freezers unless the UPS was specifically selected for that load
Air conditioners
Large pumps
Other appliances with substantial startup current

Keep the UPS focused on the network and computing equipment it was purchased to protect.

Ancillary Gear I Would Buy With the UPS

The UPS is the major purchase, but a few inexpensive additions make the installation better.

A plug-in watt meter

Measure the actual network load instead of guessing. Knowing whether the closet uses 90 watts or 350 watts completely changes the runtime discussion.\

A proper rack PDU if you need more outlets

For rack installations, use suitable power distribution rather than a pile of consumer power strips. Follow the UPS manufacturer’s recommendations for connected distribution equipment.

An optional network-management card where it adds value

This is most useful when the UPS sits in a remote location, supports several machines or needs to be monitored without depending on one USB-connected computer.

The Eaton 5P supports an optional network card. APC’s Smart-UPS models include SmartConnect and a SmartSlot for additional management options. CyberPower supports optional remote network management on the CP1500PFCLCD.

A replacement-battery reminder

Put a calendar reminder in place when the UPS is installed. Waiting until the battery fails defeats a large part of the reason you bought the UPS.

My Buying Decision

If I were building a normal home network closet today, I would buy the CyberPower CP1500PFCLCD first. It gives me the combination of capacity, sine-wave output, communications and price that makes sense for most home setups.

If the NAS or server were more important, or if I expected to invest in better UPS management, I would move to the APC SMT1500C or Eaton 5P1500.

If the entire installation were rack-mounted, I would strongly consider spending the extra money on the APC SMT1500RM2UC rather than finding somewhere to put a tower.

But I would make that decision only after measuring the actual load.

A 1500VA UPS is not automatically better because the number is larger. The goal is to buy enough capacity and runtime for the equipment, give the NAS time to shut down cleanly, and make sure the UPS can tell you when its battery is no longer ready to do the job.

Frequently Asked Questions

What size UPS do I need for a home network closet?

Measure the actual wattage of the modem or ONT, router, switches, PoE devices, NAS and other equipment you want to protect. For a larger network closet containing a NAS and PoE equipment, a 1500VA-class UPS is a useful starting point, but the correct size depends on both total watts and the runtime you need.

Is a 1500VA UPS overkill for a router and modem?

Usually. If you are only protecting a modem or ONT and Wi-Fi router, see our router and modem UPS guide. The larger units in this article make more sense when a NAS, PoE switch, cameras, access points or servers are part of the load.

Should my NAS be connected to a UPS?

Yes, if the NAS contains data you care about. A UPS can protect it from brief outages and, with compatible communications and software, provide enough warning for a controlled shutdown during a longer outage.

Can TrueNAS shut itself down when the UPS battery is low?

Yes. TrueNAS uses Network UPS Tools for UPS monitoring and shutdown functions. Verify that your exact UPS is supported and configure and test the shutdown behavior before depending on it.

Should a PoE switch be on the UPS?

If the PoE switch powers equipment you want available during an outage, such as cameras or Wi-Fi access points, putting it on battery backup can protect all those devices at once. Remember that their combined PoE consumption is part of the UPS load.

How long will a UPS run my network?

Runtime depends on UPS model, battery condition and actual load. Do not estimate it from the VA rating alone. Measure the network’s wattage and use the manufacturer’s current runtime chart or calculator for the specific UPS.

Should I buy a rackmount or tower UPS?

Buy a tower UPS if you want flexibility and value. Buy rackmount when the network already lives in a rack and the cleaner installation is worth the added cost and rack space.

Will a UPS keep my internet working during a blackout?

It can keep your equipment powered, but it cannot guarantee that the ISP’s upstream infrastructure stays online. For a remote property where connectivity is critical, consider cellular failover in addition to UPS backup.

Can I plug a surge protector into a UPS?

Do not assume that an ordinary surge strip or extension cord is acceptable. Manufacturers including APC and CyberPower warn against common surge-strip configurations with their UPS products. If you need more rack outlets, use an appropriately rated PDU and follow the UPS manufacturer’s instructions.

How often should I replace a UPS battery?

Battery life varies with battery chemistry, temperature, discharge frequency and UPS design. Instead of relying only on age, monitor the UPS, perform tests and make sure the battery can still support the actual load. Replace a weak battery before you need it during a real outage.

Published on August 9, 2026

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Best UPS Battery Backup for Routers and Modems (Keep Your Internet Running During Power Outages)

If your internet connection disappears the moment the power flickers, the problem usually isn’t your internet provider.

It’s your power.

Most home networks rely on several small devices that all require electricity: a modem, a router, sometimes Wi-Fi access points, switches, or security cameras. When power fails, every one of those devices shuts off instantly.

A UPS (Uninterruptible Power Supply) solves this problem by providing instant battery backup. When electricity fails, the UPS switches to battery power automatically and keeps your networking equipment running.

Because routers and modems draw very little power, even a modest UPS can often keep your internet working for an hour or more.

Quick pick: For most homes, I would start with the CyberPower CP1000PFCLCD. It has enough capacity for a modem, router, switch, access point, and a little room to grow without jumping to a giant UPS.

Just a modem and router: the APC BE650G1 or CyberPower EC650LCD is usually enough.
Router, modem, switch, access point, or cameras: step up to the CyberPower CP1000PFCLCD.
Network closet, rack, NAS, PoE, or multiple access points: see my guide to the best UPS for a home network closet.

Do not plug in a laser printer, space heater, gaming PC, or anything high-draw unless the UPS is sized for it. For this guide, the goal is simple: keep the internet online when the power flickers or goes out.

Best UPS Battery Backup for Routers and Modems

If your goal is keeping your internet connection alive during a power outage, these are the UPS models I would consider first.

UPS Model	Best For	Capacity	Why Pick It	Check Price
CyberPower CP1000PFCLCD	Best overall UPS	1000VA / 600W	The best balance for most home networks: modem, router, switch, access point, and some room to grow.	Check price on Amazon
APC BR1500MS2	Larger home networks	1500VA / 900W	Better for network closets, multiple access points, switches, cameras, or a small rack.	Check price on Amazon
CyberPower EC650LCD	Best budget UPS	650VA / 390W	A good low-cost pick if you mainly want to keep a modem and router online.	Check price on Amazon
APC BE650G1	Small setups	650VA / 390W	Compact, simple, and easy to tuck near a modem/router shelf.	Check price on Amazon

Can a UPS Keep Wi-Fi Working During a Power Outage?

Yes. A properly sized UPS can keep your modem, router, Wi-Fi access point, and small network switch running during short power outages. The runtime depends on the size of the battery backup and how much equipment is plugged into it.

For many home setups, the goal is not to run the entire house. It is to keep the internet connection alive long enough for brief outages, remote work, smart-home devices, security cameras, and alerts to keep functioning.

If your internet provider’s equipment outside the home still has power, a UPS can often keep your home network online. If the neighborhood equipment is also down, the UPS may keep your router running but not preserve the internet connection.

My buying rule: if you only have a modem and router, do not overthink it. A compact 600VA–650VA UPS is often enough. If you have a switch, access point, security camera base station, or smart-home hub, I would usually move up to a 1000VA unit.

That is why the CyberPower CP1000PFCLCD is the safest pick for most people. It is not the cheapest option, but it avoids the common mistake of buying the smallest UPS and then immediately running out of outlets or runtime.

Why Routers and Modems Benefit From a UPS

Networking equipment consumes surprisingly little electricity.

Typical power usage looks like this:

Modem: 10–20 watts
Router: 10–25 watts
Wi-Fi access point: 10–20 watts
Small network switch: 5–20 watts

Because the power draw is low, UPS batteries can keep networking equipment running far longer than desktop computers or gaming systems.

A UPS also protects networking hardware from:

power outages
voltage drops
power surges
short power interruptions

If you work from home, rely on internet-connected security cameras, or have smart home devices that stop working when the network goes down, a UPS can make a bigger difference than you might expect.

If those devices are part of a second-home or vacation-home monitoring setup, the router and modem are not just convenience devices. They are a vital part of your alert system. I cover the broader setup in my guide to vacation home remote monitoring.

Best Overall UPS for Routers and Modems: CyberPower CP1000PFCLCD

The CyberPower CP1000PFCLCD is the one I would buy first for a typical home network.

It is more UPS than a bare modem-and-router setup strictly needs, but that is the point. Most home networks grow. A modem and router become a modem, router, switch, access point, smart-home hub, and maybe a camera bridge. A little extra capacity keeps the UPS useful after the next upgrade.

1000VA / 600W capacity
Pure sine wave output
Automatic Voltage Regulation
LCD status display
Enough headroom for many modem/router/switch/access-point setups

Buy this if: you want one UPS that should handle a normal home network without being huge.

Skip it if: you only need the cheapest possible backup for one modem and one router.

Check the latest price on Amazon

Best UPS for Larger Home Networks: APC BR1500MS2

The APC BR1500MS2 is the step-up pick for people whose “router setup” has turned into a small network closet.

If you have multiple access points, a switch, security-camera gear, a small NAS, or a rack shelf full of boxes, the extra capacity and outlets start to matter. This is probably overkill for a basic modem and router, but it makes sense once the network becomes something the household depends on.

1500VA / 900W capacity
10 outlets
Strong voltage regulation
USB charging ports
More room for network closets and larger setups

Buy this if: you have more than just a modem and router, or you want longer runtime.

Skip it if: your internet setup lives on a small shelf and only has two devices.

Check the latest price on Amazon

Best Budget UPS for Routers and Modems: CyberPower EC650LCD

The CyberPower EC650LCD is the practical budget pick.

If your problem is simple — brief outages knock out the modem and router, then everything takes several minutes to reboot — this is the kind of UPS that solves it without turning the project into a home-lab upgrade.

650VA / 390W capacity
Compact design
LCD battery display
Energy-saving outlets

Buy this if: you want an affordable UPS for a modem and router.

Skip it if: you also need to support multiple access points, a PoE switch, a NAS, or a network closet.

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Best Compact UPS for Small Setups: APC BE650G1

The APC BE650G1 is a small UPS designed for simple networking setups.

650VA / 390W capacity
compact footprint
8 outlets
user-replaceable battery

If you only want to keep a modem and router running, this compact UPS can do the job without taking up much space. It is especially appealing if your equipment lives on a shelf, in a corner, or anywhere a larger UPS would be awkward.

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How Long a UPS Can Keep Your Internet Running

UPS runtime depends on how much electricity your devices use.

Because routers and modems consume very little power, runtime can be surprisingly long:

small UPS: 30–60 minutes
mid-size UPS: 1–2 hours
larger UPS: several hours depending on load

If your ISP’s neighborhood equipment stays online during an outage, that can mean your internet keeps working long after the lights go out. Of course, if the provider’s own local infrastructure loses power, your UPS cannot fix that. But for many brief outages and localized electrical issues inside your home, it absolutely helps.

How Much UPS Capacity Do You Actually Need for a Router and Modem?

This is one of the biggest mistakes people make when shopping for a UPS. They assume they need a huge battery backup because that is what they would need for a gaming PC or home server.

For a modem and router, that usually is not true.

If your combined load is only 20 to 40 watts, even a modest UPS can provide meaningful runtime. The bigger units are useful if:

you want much longer runtime
you also want to power access points, switches, or cameras
you want extra overhead and flexibility

For a simple setup, the budget and compact models are often enough. For more complicated home networks, the larger units become easier to justify.

Need Backup Power for More Than Your Internet?

A UPS is ideal for keeping a modem, router and other networking equipment alive through short outages. But if you also want to run a refrigerator, freezer, lights or other household equipment, you quickly move beyond normal UPS territory.

For longer outages, see our guide to portable power stations vs. generators. If a battery system makes more sense for you, we also compared the best 2kWh portable power stations for home backup.

UPS Features That Matter for Networking Equipment

When choosing a UPS for routers and modems, these features matter most:

Automatic Voltage Regulation (AVR) to stabilize power fluctuations
pure sine wave output for sensitive electronics
surge protection for networking hardware
sufficient outlets for your modem, router, and other equipment

You do not necessarily need the most expensive UPS on the market, but you do want one that handles brownouts and voltage fluctuations gracefully. Those are often more common than full outages.

If you want to understand these features in more detail, see this guide to choosing a UPS with the right features.

If you are deciding between UPS models for a router, NAS, home server, or monitoring setup, that broader UPS feature guide goes deeper on AVR, PFC compatibility, USB shutdown, and replaceable batteries.

When a UPS Makes the Biggest Difference for Home Internet

A UPS battery backup is especially useful if:

power flickers frequently
you work from home
your security cameras rely on internet connectivity
your smart home devices depend on cloud services
your modem takes several minutes to come back online after a power outage

Even brief outages can lead to several minutes of downtime while a modem and router reboot. A UPS prevents that interruption entirely and can make your home internet feel much more reliable.

The same logic applies if your home network supports leak sensors, door and window sensors, smoke/CO alerts, or remote cameras. Those alerts are only useful if the network stays online long enough to send them. For more on that side of the setup, see my guides to Govee leak sensors, door and window sensors for a vacation home, and smoke and carbon monoxide detectors.

What I Would Buy

For most people, I would buy the CyberPower CP1000PFCLCD. It has enough capacity for a normal home network, gives you room to add a switch or access point, and avoids the regret of buying the smallest possible UPS.

For a very simple modem-and-router setup, I would save money with the CyberPower EC650LCD or APC BE650G1.

For a larger network closet, I would move up to the APC BR1500MS2.

The main thing is not to put your entire office on the UPS just because there are empty outlets. Use it for the networking gear that keeps the house online. That is where a UPS gives you the most value for the least battery drain.

Which UPS Is Best for Your Router and Modem?

If you want the best balance of price, features, and runtime, the CyberPower CP1000PFCLCD is the strongest overall choice for most people.

If you have a larger home network or want more runtime, the APC BR1500MS2 is a strong upgrade.

If you want a lower-cost solution, the CyberPower EC650LCD and APC BE650G1 are both sensible picks for simple setups.

For something as simple as keeping your router and modem online during a power outage, a UPS is one of the most practical upgrades you can make. Once you have one, it is hard to go back to watching your internet disappear every time the power blinks.

Published on March 29, 2026

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