When the power goes out during a torrential downpour, your primary sump pump becomes useless, leaving your basement vulnerable to costly flooding. A dedicated battery backup system is your only line of defense, automatically kicking in to protect your home and peace of mind. These systems are designed to work seamlessly with your existing pump, ensuring continuous operation no matter what Mother Nature—or the power grid—throws your way.
Choosing the right backup depends on your specific needs, including your basement’s flood risk, the capacity of your primary pump, and desired features like smart monitoring. From heavy-duty workhorses to intelligent Wi-Fi-connected units, there is a solution for every home. This roundup highlights eight of the best battery backup options to keep your basement dry when you need it most.
Reliable Battery Backup Systems for Your Sump Pump
- Westinghouse 12 Volt Battery Back Up Sump Pump
- WAYNE 1/2 HP Basement Sump Pump System
- Zoeller 508-0005 Aquanot 508 Battery Back-Up
- 822PS Sump Pump Backup System
- PumpSpy PS2000C SmartPump Combination System
- Basement Watchdog Combo Primary & Backup System
- Wayne ESP25 Upgraded 12-Volt System
- Zoeller 507-0005 Aquanot 508 System
Westinghouse 12 Volt Battery Back Up Sump Pump
For those seeking a robust and dedicated backup pump, the Westinghouse 12V model is a formidable choice. It boasts a heavy-duty construction capable of moving up to 2,700 gallons per hour, providing significant power to handle intense water flow during an outage. This unit is designed specifically as a backup, meaning it installs alongside your existing primary pump to take over the moment power is lost.
Its 12-volt operation ensures compatibility with standard deep-cycle marine batteries, making it a reliable and straightforward system. The pump is built for durability, offering peace of mind that it will perform when called upon. Remember that a battery is required for operation and is sold separately, allowing you to select a power source that fits your runtime needs.
WAYNE 1/2 HP Basement Sump Pump System
The WAYNE WSS30VN is a comprehensive solution that combines a powerful primary pump with built-in battery backup capability. This all-in-one system is designed for high-volume water removal, with the primary pump handling up to 5,100 gallons per hour. Its integrated design means both your primary and backup systems are housed in a single, preassembled unit for a cohesive defense.
Installation is notably simple, with the system ready for a drop-in setup in about 15 minutes without the need to drill a weep hole. A major benefit is its efficiency on a single charge; it can remove up to 10,000 gallons of water when running on battery power. This makes it an excellent option for areas prone to prolonged power outages during storms.
Zoeller 508-0005 Aquanot 508 Battery Back-Up
Zoeller is a trusted name in sump pumps, and the Aquanot 508 lives up to that reputation with its focus on efficiency and durability. The pump is constructed from non-corrosive materials, ensuring a long service life even in the harsh, wet environment of a sump basin. This 12-volt system is engineered for reliability, providing a steadfast backup when your main pump loses power.
Key features that simplify maintenance and operation include an integrated check valve and a quick disconnect discharge. These design elements make installation and any future service checks more straightforward. The Aquanot 508 is a solid choice for homeowners who prioritize proven performance and a robust build quality from an industry leader.
822PS Sump Pump Backup System
The Pump Sentry 822PS takes a different approach by acting as a power inverter backup for your existing AC primary sump pump. Instead of installing a separate backup pump, this unit provides battery power to your current pump during an outage. It automatically switches to battery power the moment it detects a loss of AC electricity and recharges when power is restored.
Housed in a compact and durable aluminum case, this UL and CSA accredited unit is a 1200-watt system designed to operate most sump pumps drawing up to 9 amps. It offers a clean and silent operation with clear indicators for power output, battery charge, and when the battery needs replacing. This is an ideal solution for those with a reliable primary pump who simply need to add battery runtime.
PumpSpy PS2000C SmartPump Combination System
For the tech-savvy homeowner, the PumpSpy PS2000C offers top-tier protection with smart connectivity. This pre-assembled system includes both a powerful 1/2 HP primary pump and a 12V battery backup pump, all with integrated Wi-Fi monitoring. You can receive real-time alerts and check the status of both pumps and the battery from anywhere using your smartphone.
The system performs automated tests every two days to ensure everything is functioning correctly, providing constant reassurance. With a primary pump capacity of 4,320 GPH and a backup that can move 3,600 GPH, it delivers substantial pumping power. The dual backup pump switches add an extra layer of protection, making this one of the most comprehensive and intelligent systems available.
Basement Watchdog Combo Primary & Backup System
The Basement Watchdog Combo system simplifies basement protection by coming preassembled and preplumbed, allowing for a very quick and easy installation. It combines a 1/3 HP energy-efficient primary pump with a dedicated battery backup pump into a single, coordinated unit. The primary pump uses a permanent split capacitor (PSC) motor, which can lead to savings on your electric bill over time.
This system is built for reliability, with the primary pump capable of handling 3,100 GPH at a 10-foot lift. The integrated monitoring controller keeps you informed about the system’s status. If you are looking for a straightforward, out-of-the-box solution that eliminates the guesswork of pairing separate components, this combo system is an excellent contender.
Wayne ESP25 Upgraded 12-Volt System
The Wayne ESP25 is an upgraded battery backup system designed to provide dependable performance when you need it most. As a 12-volt system, it offers a reliable source of power for continuous pumping during an electrical outage. Wayne pumps are known for their durability and this model is built to deliver, ensuring your basement stays protected.
This system is engineered for compatibility and ease of use, working with standard deep-cycle batteries. It serves as a strong secondary line of defense, activating automatically to take over for your primary pump. For homeowners who trust the Wayne brand and want a focused backup solution, the ESP25 is a solid and reliable option to consider.
Zoeller 507-0005 Aquanot 508 System
Another offering from the reputable Zoeller brand, this battery backup system is engineered for maximum reliability and longevity. It features a robust construction with non-corrosive components, ensuring it can withstand the demanding conditions inside a sump pit. This focus on durable materials means you can count on this system for years of service.
The Zoeller Aquanot system is designed for straightforward integration as a backup to your primary sump pump. It provides the essential function of taking over during a power failure without unnecessary complexity. For those who value time-tested engineering and a no-nonsense approach to basement flood protection, this Zoeller system is a premier choice.
How to Choose a Battery Backup for Your Sump Pump
When the power goes out during a heavy storm, your primary sump pump is useless. That’s where a battery backup system comes in, acting as a crucial safety net to keep your basement dry. I’ve learned that not all backups are created equal, and picking the right one means looking at a few key factors to ensure it works when you need it most.
First, consider the battery type and capacity. Most systems use either Absorbent Glass Mat (AGM) or flooded lead-acid batteries. AGM batteries are sealed, maintenance-free, and generally my go-to recommendation because they’re safer and don’t release gas. Capacity, measured in Amp-hours (Ah), tells you how long the system can run. A higher Ah rating means more pumping time. Think about how long your power typically goes out and choose a battery that can handle at least a few hours of continuous use.
Next, look at the pump technology. Backup systems typically use either a centrifugal pump (similar to your main pump) or a diaphragm pump. Centrifugal pumps can move a lot of water quickly but use more battery power. Diaphragm pumps are more energy-efficient and better at handling small amounts of water over a long period, but they have a lower maximum flow rate. Some of the best systems even allow you to connect your existing primary pump to the backup unit, creating a seamless, integrated solution.
You also need to check the power and connectivity. The backup pump should have its own dedicated discharge pipe. Tying it into your existing pipe can cause problems and reduce efficiency. Look for a unit with an alarm—both for when the backup pump activates and for when the battery charge is low. This gives you an audible heads-up that something is wrong. A built-in battery charger is a must-have feature to keep your battery topped up and ready for action.
Finally, think about installation and maintenance. Some systems are more DIY-friendly than others. If you’re not comfortable with plumbing and basic electrical work, factor in the cost of professional installation. For maintenance, AGM batteries are easier since you just need to check the terminals for corrosion and ensure the charger is functioning. A little proactive care ensures your 8 best battery backup options for your existing sump pump will be ready to perform during the next big storm.
Frequently Asked Questions
Do I really need a battery backup if I have a primary sump pump?
Absolutely. Your primary sump pump relies entirely on your home’s electrical power. During severe storms, which are often when you need pumping the most, power outages are common. A battery backup system operates independently, ensuring your basement continues to be protected even when the lights are out. It’s not a luxury; it’s an essential layer of defense for your home.
How long will a battery backup run my sump pump?
This depends heavily on the battery’s Amp-hour (Ah) rating and how often the pump has to cycle. A typical 35-50 Ah AGM battery might run a backup pump for 5 to 7 hours of continuous pumping, but this can vary. If the pump is only running for 30 seconds every few minutes, the battery could last through an entire day-long outage. For longer runtimes, you can often connect a larger, external battery.
Can I install a battery backup system myself?
Many units are designed for DIY installation if you’re handy with basic tools and comfortable with simple plumbing and electrical connections. The process usually involves setting up the backup pump in your sump pit, connecting it to a dedicated discharge pipe, and wiring it to the battery and charger. However, if you have any doubts, hiring a professional plumber is a smart investment to ensure everything is set up correctly and safely.
What is the difference between a water-powered and a battery-powered backup?
A battery-powered backup uses a pump and a dedicated battery to remove water. A water-powered backup, often called a “water-powered sump pump,” uses your home’s municipal water pressure to create a vacuum and pump water out. The big advantage of a water-powered unit is that it will run indefinitely as long as you have city water pressure. The downside is it uses a significant amount of water (which you may be billed for) and cannot be used if you are on a well. For most people, a reliable battery system is the more practical choice among the 8 best battery backup options for your existing sump pump.
How often should I maintain my battery backup system?
You should test your entire system at least twice a year, ideally before the wet seasons in spring and fall. Pour a bucket of water into the sump pit to trigger the backup pump and make sure it activates and moves water properly. Physically check the battery for any signs of corrosion or damage. For flooded lead-acid batteries, you’ll need to check and top off the water levels with distilled water every few months. AGM batteries are maintenance-free but should still be visually inspected.
What does the alarm on my backup unit mean?
Most quality backup systems have two main alarms. A high-water alarm sounds when the water level has risen enough to trigger the backup pump, alerting you that the primary pump has failed or power is out. A low-battery alarm means the battery charge is critically low and needs to be recharged or replaced. Never ignore these alarms; they are your first and most important warning that your basement is at risk.