Getting the size right
How a battery gets sized
Sizing starts with a question: what do you want to keep running, and for how long? From there it comes down to a few inputs.
- The loads you want to back up
- How much power your home uses each day
- How many hours or days of backup you want
- The size of your solar system, if you have one
- Your utility rates and rate plan
Using less power means you need less battery. That is why we often look at energy efficiency first, since a tighter home can mean a smaller, cheaper battery.
One battery or several
More battery capacity gives you more backup time or more loads at once. The right number comes from your assessment, not a rule of thumb.
