What are the best batteries for whole-home backup in 2025?

Installing a whole-home battery backup system means you won’t need to break out the candles or worry about the food in the refrigerator during power outages. With enough storage capacity, you can avoid the inconvenience of outages without sacrificing your daily routines.

Despite their convenient appeal, whole-home backup isn’t the norm. Most home energy storage systems provide partial backup power during outages. These smaller systems support critical loads, like the refrigerator, internet, and some lights. Whole-home setups allow you to maintain normal energy consumption levels—but at a cost. You’ll need about three times as much power for a whole home backup system, which is about three times the price of a partial home setup. 

Let’s explore the top devices for whole-home backup, how to compare your options, and how much storage capacity you’ll need.

Partial home battery backup systems generally make more sense for the average American home, which is why we have a separate ranking of the best home batteries. But a whole-home setup may be worth it if you live in an area with frequent blackouts.

*Prices reflect the federal tax credit but don't include solar panels, which you'll need to keep your battery charged during an outage.

The difference between whole-home and partial-home battery backup systems is pretty self-explanatory:

• Whole-home battery backup systems can power your entire home in the event of an outage. You’ll need a battery system that’s about the size of your daily electricity load—about 30 kilowatt-hours (kWh) on average. 

• Partial-home battery backup systems support only the essentials and usually store around 10 to 15 kWh. 

The actual batteries are the same; whole-home backup systems just have more of them. Batteries are similar to generators with small and whole-home options, except that they rely on free, clean energy rather than expensive fuel.

Given that long-duration power outages are infrequent in most parts of the country, a partial-home battery backup system is generally all you’ll need. But, if your utility isn’t always reliable for power, whole-home battery backup may be the way to go.

1. HomeGrid Stack'd Series: Most powerful and scalable

• Price: $973/kWh 

• Roundtrip efficiency: 98%

• What capacity you should get: 33.6 kWh

• How many you need: 1

The HomeGrid Stack’d series is the biggest and most scalable battery on our list. It boasts an impressive usable capacity—up to 38.4 kWh per stack—and up to 576 kWh total, making it more than qualified to handle your whole-home backup needs with a single stack. 

With continuous power up to 14.4 kW, the Stack’d Series is powerful enough to run multiple appliances at the same time. Its modular design allows you to scale as needed so your battery backup system can grow with your needs. It’s also our most efficient battery at 98%. 

The biggest downside is that HomeGrid’s warranty only guarantees 60% initial capacity at the end of its term, while most batteries on our list guarantee 70%.   

2. Duracell Power Center Max Hybrid: Best price

• Price: $564/kWh

• Roundtrip efficiency: 96%

• What capacity you should get: 30 kWh

• How many you need: 1

The Duracell Power Center Max Hybrid battery was ranked in our top five best solar batteries of 2025, and it’s also our second-ranked pick for the best whole-home battery backup. 

Not only does it provide ample storage capacity, but it also has the highest continuous power (crucial for a whole-home setup). It’s a top performer in just about everything, which is why we’re so impressed with its price—the Duracell Power Center Max Hybrid is pretty affordable compared to some other batteries on our list. And, it’s highly efficient at 96%.

Unfortunately, Duracell’s warranty is lacking compared to others on this list, only guaranteeing 70% capacity for 10 years, while many of its competitors offer 12-15 years of protection.

3. Savant Power Storage: Best for whole-home integration

• Price: $711/kWh

• Roundtrip efficiency: 93.8%

• What capacity you should get: 18.5 kWh

• How many you need: 2

Rounding out our top three whole-home backup batteries is the Savant Power Storage battery. Most homes need around 30 kWh for a day of whole-home backup, so we recommend investing in two of these 18.5 kWh devices to meet your needs. You can also stack these batteries to get up to 180 kWh of storage capacity if you need it.

The Savant Power System integrates with home automation systems so you can monitor and control energy use from your smartphone. It’s backed by a 10-year warranty guaranteeing at least 75% of its original capacity, which is slightly better than the standard 70% offered by most competitors.

The 12.5 kW continuous power output and 93.8% efficiency of the Power Storage falls short of what’s offered by Duracell and HomeGrid, but it’s still powerful enough to meet most homeowners’ needs.

4. FranklinWH aPower 2: Longest warranty

• Price: $1,140/kWh

• Roundtrip efficiency: 90%

• What capacity you should get: 15 kWh

• How many you need: 2

FranklinWH is one of the fastest-growing battery brands on EnergySage and the most-quoted battery brand in our top five ranking. The company gained a 10% marketplace share in just a year.

The aPower 2 battery’s biggest differentiator is its warranty—FrankinWH offers an industry-leading 15 years of coverage, more than the rest of our top batteries. It adequately stores 13.6 kWh, but its continuous power is the lowest on our list at just 10 kW, which isn’t too surprising as this battery can only be AC-coupled. It’s also pricier compared to other batteries on this list.

5. SolaX Power T-BAT H

• Price: $1,111/kWh

• Roundtrip efficiency: 95%

• What capacity you should get: 18 kWh

• How many you need: 2

The T-BAT H really stands out for its warranty; while it’s not the longest,  it guarantees your battery will retain no less than 90% of its capacity by the end of its 12-year term, while most other batteries only guarantee 60-75%.

With a usable capacity of 9 kWh per battery and up to 72 kWh per inverter, it’s not the most powerful or scalable battery on our list. Still, its continuous and peak power output of 11.1 kW ensures reliable performance, while its 95% roundtrip efficiency means you’ll get more energy out of every charge.

The T-BAT H is AC-coupled, which is helpful if you’re looking to add storage to an existing solar panel system. While its capacity is on the smaller side compared to other options, its efficiency, scalability, and exceptional warranty make it a solid choice for long-term energy storage and earned it a spot in our top five.

*Price per kWh reflects the average battery cost from that brand, not the individual model.

**Total system price reflects the federal tax credit but doesn't include solar panels.

Whether partial or whole-home, battery backup systems insulate you from disruptions caused by power outages, effectively boosting your home’s resiliency.

Pairing your solar panels with a battery backup system provides you with renewable resilience. If your solar system is grid-connected (most are), your panels will shut down with the grid for safety reasons; even if your solar panels generate enough electricity to meet 100% of your home’s needs, you’ll still be without power during an outage. A battery backup system can keep your home running on renewable energy even during a blackout.