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How Big Should A Home Battery Be
Sizing comes down to two numbers: how much energy you need stored, and how much power you need at once.
Step 1: List What You Must Keep Running
Typical essentials are the refrigerator, lights, internet, phone chargers, a furnace fan, and a medical device if you have one. Add a well pump or garage door opener if they apply.
Step 2: Estimate Daily Energy
Check the watts on each device label, multiply by the hours it runs per day, and add them up in kilowatt hours. Your utility bill also shows monthly use, which divided by 30 gives a rough daily average for the whole house.
Step 3: Match Capacity To Your Goal
| Goal | What To Plan For |
|---|---|
| Short outages, essentials only | One battery is often enough for a few circuits. |
| Longer outages or larger loads | Plan for more capacity, or pair with solar so it can recharge. |
| Daily bill savings | Size to the evening hours you want to cover, not the whole day. |
Ask For Numbers In Writing
Request usable capacity, continuous power, and the list of backed up circuits on every quote.
Ready To Compare Quotes?
Use our checklist to compare installer quotes side by side. In Texas, see txhomebattery.com for local outage, utility, and incentive guides.
How To Compare Quotes