The BEST Battery Backup Sump Pump to Prevent Flooding [2020 Edition]

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If you have a basement that is lower than the natural water table or is prone to flooding, you NEED to rely on a sump pump.

Obviously, you know this! But what happens if your power goes out? 

No one wants this to happen to their basement!

Being that sump pumps work their hardest through storms and downpours, it can also be their ultimate weakness as the power is more likely to go out in a storm. 

Once your primary sump pump goes out, there is nothing to stop the imminent rising of water in your basement.

So how to circumvent this glaring problem? Place your sump pump on a battery backup, of course!

Unfortunately, you can’t just hook up your pre-existing sump pump to a car battery and cross your fingers that it will work. (I will go over that later in the article).

In this guide, I am going to walk you through everything you need to know about sump pumps, battery backups, and then cover the best battery backup sump pumps on the market today.

If you are interested, I also have an article on the best submersible sump pump if you are looking for a primary pump as well. 

Let’s get started!

Don’t feel like reading? Watch my video version on YouTube!

My Acclaims:

  • Battery gets trickle charged so always at optimal levels
  • Extremely easy installation
  • Comes with a nice LED screen

My Criticisms:

  • Cannot control volume level of the alarm
  • Unusual float switch design
  • Non adjustable 20 second runtime

The Wayne battery backup sump pump system can pack a huge amount of water out of your basement! 

On a full battery charge the pump can handle moving 10,000 gallons.

The system trickle charges the battery so it always stays at optimum levels. 

Overall a great system for a decent price. 

How Does a Battery Backup Sump Pump Work?

In a typical sump pump installation, a sump pump is placed into a sump pit located in the basement. 

The pump is triggered to turn on from either a pressure sensor or a floating valve.  

If the electricity is cut off, the pump goes completely dead and places your home at risk of flooding. 

The battery backup sump pump has an additional pump installed on a battery system that works just like your primary sump pump.

The pump gets triggered to run by a float or tether valve rising from increasing water levels.

This way the water pump will turn on even if your original pump is running but gets inundated with too much water.

It is important to note that the battery backup pump will only pump for a certain amount of time; you will need to check the number of gallons it will pump per the life of the battery.

There are backup pumps that have AC/DC batteries that trickle charge from being plugged into an outlet. This situation will keep the pump going as long as the power stays on. 

Most battery backup sump pumps come with an alarm installed to notify you that it has been triggered. Some smart backup systems will send you a notification to your phone.

Backup sump pump setup

How to Add a backup battery to an existing sump pump

It is possible to add a backup battery system to an existing pump.

The Pump Sentry is a wall mounted battery backup system that is designed specifically for turning on your sump pump in times of a power outage. 

The unit plugs into an AC outlet and trickle charges the connected battery. The unit has a sensor which tells it that the power has been cut off and triggers the battery to release its power to the sump pump. 

When the power comes back on, the unit switches the power off from the battery and back to the outlet.

There are some drawbacks to the Pump Sentry:

  1. Although the peace of mind for backup power to your sump pump is nice, it is still only one pump. If the pump gets overwhelmed with water it won’t matter how much power is running to it – your flooded out.
  2. The unit is quite expensive and does not come with a battery; it requires  a deep cycle battery which is on the higher end of pricing. 
Overall, the response has been great from homeowners, saving many people’s basements from flooding. This can make it worth the additional expense if you don’t want a secondary pump. 

Pump Sentry 822 PS- Emergency Power for Sump Pumps by Sec America

The Pump Sentry is specially built for backup water power to sump pumps and has saved many homeowners from flooding during a power failure. 

Battery Backup Sump Pumps vs Water Powered Sump Pumps

It would appear that water powered sump pumps would be the top choice for a backup sump pump system. After all, it does not use electricity to run so can never fail due to power outages or empty batteries.

There are drawbacks to both pumps, so weigh your options carefully before committing to either.

Water Powered Sump Pump Model

Pros of a water powered sump pump

  1. It requires no electricity to run. You won’t have to worry about power outages or depleted batteries.
  2.  Unlimited running time with no maintenance needed.
  3. No worries on having to replace or maintain a battery backup.
  4. These units hardly ever breakdown or need to be replaced.

Cons of a water powered sump pump

  1. Water powered sump pumps have to be connected to a water line in order to work as it needs water to run.
  2. For every 2 gallons of sump water removed, 1 gallon of city water is needed which can get very expensive. Some municipalities have actually banned these types of pumps in times of drought.
  3. Installing can be complex as it requires a whole new water line, backflow preventer, and a drain line to reduce chances of contamination.

Pros of a battery backup sump pump

  1.  Installation of the battery system is very simple.
  2. As long as you have a fully charged battery, you can get up to 10,000 gallons pumped away. You may also get an AC/DC model which trickle charges your battery.
  3.  The secondary pump can act as an assist if your primary pump gets inundated with water.

Cons of a battery backup sump pump

  1. If the power is out for too long and your battery is depleted, your backup system is dead in the water (no pun intended!).
  2. Batteries require maintenance, routine monitoring and replacement every five years or so, according to manufacturer’s directions.

 I would say that the better choice for a backup sump pump would have to be the battery powered pump. The installation process of a water powered pump is rather daunting and can be quite expensive. I also don’t like the idea of contamination of the existing water system.

A water powered pump might be a good option for new home builds when the pump can be installed much easier and more affordably. 

bottom line

A battery backup sump pump is an essential unit to have to ensure that your home won’t flood out during times of power outages. 

They are not a silver bullet and do have some drawbacks. 

Prepare to replace batteries, and maintain and monitor them to keep up maximum performance. 

Your backup system will only run as long as your battery is charged so its not an end all be all solution.

However, it is more reasonable and affordable to install than a water powered backup pump.

On to the products!

Best Battery Backup Sump Pumps

My Acclaims:

  • Battery gets trickle charged so always at optimal levels
  • Extremely easy installation
  • Comes with a nice LED screen

My Criticisms:

  • Cannot control volume level of the alarm
  • Unusual float switch design
  • Non adjustable 20 second runtime

The Wayne battery backup system has the best ratings and is the most popular backup system available on the market.

Users report that it works as it should and has saved many from flooded basements.

The pump can handle 2900 gallons per hour which is quite a bit of water and should be able to handle most flooding events. 

If used with the appropriate battery, this unit can pump out 10,000 gallons of water on a full charge.

Wayne pumps are known to be durable and reliable pumps.

As with any product, there are annoyances.

There is no volume control for the alarm and it is very LOUD. This can get quite annoying over time but can be remedied with a little DIY tissue stuffing. Just don’t plug the microphone hole too deeply or it will break. 

The float switch is a little strange; the float is on a tether system which glides up and down a rod. This in itself isn’t necessarily a drawback, but the pump runs in 20 second increments and the float does not offer up enough space to possibly cover those 20 seconds of runtime. Therefore the float needs to be set high enough so the pump doesn’t run dry.

Overall, in my opinion, this is the best battery backup sump pump system available today.




$ $




2 Years

If you do not have a sump pump system installed yet, you can get this preassembled package that comes with the primary sump pump and the secondary backup sump pump.

Wayne makes an excellent combination sump pump that packs out a whopping 5100 gallons per hour at 0 feet of head from the primary pump, and an additional 2900 gallons per hour from the secondary pump. 


Recommended Battery:

Wayne WSB1275 75Ah AGM Sealed Lead Acid Battery

Recommended for use with the Wayne Battery Backup System

My Acclaims:

  • Battery charging is a true float charger, increasing battery life
  • Sturdy heavy pump built to last
  • Extremely quiet while running

My Criticisms:

  • Screen is rather basic and can fade over time
  • Shoddy packaging; inspect unit once received
  • Power leads are a bit short

Zoeller makes some of the best pumps on the market and this backup pump does not fall short by any means!

The pump comes with a built in alarm and lights so you know that it’s kicked on.

The installation is not as easy as the Wayne system but the instruction manual is pretty direct so you shouldn’t have any problems. You will need some basic plumbing tools. 

When you receive this unit, make sure to check all the components as there has been complaints of shoddy packaging.

The LCD screen does seem to wear out over time and gets dim but the indicator lights telling if the system is functional seem to last so it shouldn’t be too much of a problem.

The power leads are a bit short making for a tight fit but it’s doable.

The price is on the higher end for the system, but not by much.

Overall, this pump gets high accolades from its users and the brand is known for high quality pumps. 

The unit does not come with a battery; make sure to purchase a deep cycle battery of at least 100 amps.




$ $ $




1 Year Warranty

If you do not have a sump pump system installed yet, you can get this preassembled package that comes with the primary sump pump and the secondary backup sump pump.


Recommended Battery: VMAX MR127 12 Volt 100Ah AGM Deep Cycle Maintenance Free Battery This battery is compatible with the Zoeller Aquanot system and will fit the containment box.

My Acclaims:

  • Can move up to 1380 gallons per hour
  • Made out of rust resistant thermoplastic
  • Small lightweight pump can fit into tight spaces

My Criticisms:

  • Loud alarm does not reset when power goes back on
  • Charge cable to the battery box is easy to dislodge
  • Inexpensive pump - you get what you pay for

The Superior sump pumps are a very popular brand as they deliver a pretty decent quality for their affordability.

The casing is made of thermoplastic which helps protect against rusting which is a typical problem for sump pumps. 

 This pump is known for its small and lightweight design weighing in only at 12 pounds.

It can move a substantial amount of water for how compact and light it is.

Be forewarned: the alarm does not shut off when the power comes back on! You will have to manually reset it every time. 

If your power flickers on and off or you are away from home, this may not be the right pump for you.

Although many users have had a great experience with this battery backup sump pump system, there are quite a few who’ve had faulty units or units that just don’t last.

I would say it is hit or miss.

If you are on a budget and don’t mind taking a chance, then this is the right setup for you.







1 Year Limited Warranty

I hope you found my guide about the best battery backup sump pumps available very informative and helpful.

I have also written a guide on how to build an off grid water pump system that could give you some good ideas. 

You may find my article on hot water recirculating pump reviews interesting as well if you want to have hot water at your fingertips!

I put a lot of time, effort and energy into researching and writing quality articles and would appreciate any likes and social shares that you have to give.

Have a wonderful day!

Regina C.
Creator of Maximum Off Grid

Hello, I am Regina! I am the creator and brain-child behind Maximum Off Grid. 

My goal is to educate and inform people interested in becoming independent from the system. 

I also provide valuable reviews on products and service that I research thoroughly and make quality  recommendations.

I hope you are enjoying my website!

Regina C. 
Creator of Maximum Off Grid

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