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UPS battery backup

Minutes: ride through a flicker, or shut down cleanly.

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Portable power stations

Hours: a charged battery, with no fuel to store.

33 guides

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Portable generators

Days: as long as the fuel lasts, always outdoors.

57 guides

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UPS battery backup

Minutes: ride through a flicker, or shut down cleanly.

Portable power stations

Hours: a charged battery, with no fuel to store.

Portable generators

Days: as long as the fuel lasts, always outdoors.

Guide 16 · UPS

How to Size a Battery Backup UPS for an Aquarium Air Pump or Filter

Add up the watts on your air pump and filter labels, then find that load on the UPS maker's runtime chart. Buy a pure sine wave UPS with enough battery outlets, and leave the heater off the battery side unless the chart shows it can carry it.

Updated Drafted and checked with AIFact-checked by the HoldBackup editorial team How this guide was madeBased on manufacturer specs and owner reports, not HoldBackup's own testing.

On this page
  1. Start with the air pump
  2. Find your real load in watts
  3. Read the runtime chart at your load
  4. Why sine wave output matters for pumps
  5. Set it up safely near water
  6. Sources

Affiliate disclosure: some store links on HoldBackup are affiliate links. If you buy through one, HoldBackup may earn a commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. How HoldBackup makes money

The verdict

Choose a pure sine wave UPS, like the listing on this page, and confirm on the maker's runtime chart that your pump and filter load lasts as long as your typical outages.

See the store link

What we check

  • Pure sine wave output for pump motors
  • Runtime at your own measured load
  • Enough battery-backed outlets
  • Outlet spacing for bulky plugs
  • Alarm you can mute
  • Replaceable battery and warranty terms
Compact tower UPS: upright unit on small feet with a narrow front display strip, a lit round power button and two vent slots on its side

Drawing of backup power equipment.

Store link UPS

CyberPower CP1500PFCLCD PFC Sinewave UPS Battery Backup and Surge Protector

One listing to compare. Check its specs against the list above before you buy.

Maker's US pageCyberPower's US page lists it with Purchase Online.cyberpowersystems.com Checked

What owners reportOwners report it works with home server and NAS shutdown software and lasts for years with fresh batteries. Forum owners also say the batteries can give out with no warning from the unit.TrueNAS forum, Unraid forum, The FPS Review forum Checked

PriceAmazon sets it, and it changes. The button takes you to today's price.

Store linkPaid link

The unit named above, on Amazon.

Check price on Amazon

HoldBackup earns a commission if you buy through this link. Amazon sets the price.

Start with the air pump

In a short outage, keeping air moving through the water is usually the first priority. A filter matters too, because it keeps water circulating and supports the bacteria living in the media. Put the air pump first on your list and the filter second.

A heater is a different case. Heaters usually draw much more than pumps, so check its label. A heater on the battery side can drain the UPS quickly and cut the pump's runtime. Plug it into a surge-only outlet, or plan to insulate the tank during a long outage instead.

  • Air pump: highest priority on battery
  • Filter: second priority on battery
  • Heater: check its label before you put it on battery
  • Lights: plug into a surge-only outlet

Find your real load in watts

Do not guess. Read the wattage on each device's label or power brick, or check the maker's spec page. A plug-in watt meter gives the most honest number, because it shows what the device draws in your setup.

For example, if your air pump label reads 5 watts and your filter label reads 15 watts, your battery load is 20 watts. That 20 watts is the number you take to the runtime chart.

Measure each device separately, then measure them together. Note whether the reading jumps when the filter motor starts.

Read the runtime chart at your load

A UPS rating tells you the most it can carry, not how long it lasts. Runtime depends on your load. Find the maker's runtime chart or calculator and look up your own wattage.

For example, if your load is 20 watts and the chart shows several hours at that load, you are covered for a typical short outage. If your outages often run longer, a larger unit or a second UPS adds time. Some charts do not list very small loads, so contact the maker if yours falls below the chart.

For outages that last a day or more, a portable power station or a battery-operated air pump may serve you better than a UPS.

Why sine wave output matters for pumps

Many aquarium pumps and filters run on small AC motors. Some UPS units put out a stepped, simulated sine wave on battery, and some motors hum, run hot, or stall on it. A pure sine wave UPS avoids that question.

The listing on this page, the CyberPower CP1500PFCLCD, is listed as a PFC Sinewave UPS Battery Backup and Surge Protector. Even so, check its spec sheet and runtime chart against your own load before you buy.

Set it up safely near water

Water and electrical gear do not mix. Keep the UPS off the floor and away from the tank, where spills and splashes can't reach it. Give every cord a drip loop, so water runs down the loop and drips off before it reaches the outlet.

Plug the UPS directly into a wall outlet, not into a power strip or extension cord. Test it once by switching off the breaker or unplugging the UPS, and watch whether the pump and filter keep running.

  • Plug the air pump and filter into battery-backed outlets, not surge-only ones
  • Check that bulky plugs don't block the outlet next to them
  • Learn how to mute the alarm before an outage starts
  • Note the battery replacement terms in the warranty

Sources

Recorded AI check: Oct 5, 2026. The sources below may include later additions. AI checks compare factual numbers and checkable claims with web sources; they do not verify every statement.

Best UPS battery backup for a home and APC vs CyberPower compare units from the makers' numbers. Every guide in this class is in UPS battery backup.

How this guide was made

  1. Drafted and checked with AI. An AI model wrote the draft from the guide's topic. A second AI pass looked for factual numbers to check against web sources. This does not verify every statement. A draft that fails the check is held for review.
  2. Fact-checked by the HoldBackup editorial team. On , a person on the HoldBackup editorial team reviewed this guide against its sources. That is a review of the writing, not a test of any unit.
  3. General guidance only. No prices, rankings, or test results, because we have none to back them. Check any number against the maker's own spec sheet.
  4. No lab tests, and we say so. HoldBackup has not run any unit named here.
  5. The store link is not a pick for this guide. It goes to a unit in this product class that this guide does not review. Check it against the list above before you buy.
  6. Labelled store links. A store button goes straight to Amazon with HoldBackup's affiliate tag. HoldBackup counts the click. A live button carries a "paid link" label, and the disclosure sits above the first one on every guide.

Questions

Can a UPS run my aquarium heater too?

Only if the runtime chart shows enough time at your combined load. Heaters usually draw much more than pumps, so check the heater's label first. Adding it to the battery side can cut your pump's runtime sharply.

How long will a UPS keep my air pump running?

That depends on your load and the unit. Measure your pump with a watt meter or read its label, then look up that number on the maker's runtime chart.

Do I need pure sine wave output for an aquarium pump?

It is the safer choice. Some pump and filter motors hum, run hot, or stall on simulated sine wave power. Pure sine wave output avoids the problem.

Will the UPS beep all through an outage?

Most UPS units sound an alarm on battery, and many let you mute it. Check the manual so you know how to mute yours before you need to.

Where does the price button go?

Straight to Amazon. Amazon sets the price and availability, and both can change.

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