- Essential-load backup: Keeps a few critical circuits powered, such as lights, Wi-Fi, phones, a refrigerator, or a sump pump
- Whole-home backup: Aims to support most or all of the house, though often with load management to avoid overtaxing the system
- Solar self-consumption: Stores daytime solar production for use at night, even if outages are not your main concern
If you’re looking at solar energy storage, the first question is usually not which battery is “best,” but what you want it to do during an outage. Some homeowners only want to keep lights, internet, and a refrigerator running.
Others want broader backup for more of the house. The right choice depends on your goals, your existing solar setup, and how much interruption you’re trying to avoid.
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Home batteries can be useful even when the grid is working. They can help store excess solar generation for evening use, reduce reliance on utility power, and provide backup during outages.
But battery systems vary a lot in size, design, and installation needs, so it helps to compare them on a few practical criteria instead of marketing language.
Start with the backup goal, not the brand
Before comparing products, decide what problem you want the battery to solve. That may sound basic, but it changes everything from the battery size to the installer’s design recommendations.
- Essential-load backup: Keeps a few critical circuits powered, such as lights, Wi-Fi, phones, a refrigerator, or a sump pump.
- Whole-home backup: Aims to support most or all of the house, though often with load management to avoid overtaxing the system.
- Solar self-consumption: Stores daytime solar production for use at night, even if outages are not your main concern.
We go deeper on this in the details that matter — worth a read before you decide anything.
If your main goal is outage protection, think about what you truly need to power and for how long. If your goal is energy management, daily cycling performance and software features may matter more than backup duration alone.
Understand the two specs that matter most: capacity and power
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Battery shopping often gets confusing because two batteries can look similar on paper but behave very differently in real use. The most important specs are capacity and power output .
Capacity: how much energy the battery can store
Capacity is usually measured in kilowatt-hours, or kWh. In simple terms, it tells you how much energy the battery can hold. But what matters to homeowners is usable capacity, not just the nameplate number.
Some systems reserve part of the battery to help protect battery health, so the usable amount may be lower than the listed total.
