Home Battery Capacity Sizing: A Simple Method
Home Battery Capacity Sizing
Home battery capacity sizing follows a simple method: daily kWh x backup hours / usable depth = nominal pack size.
Formula
| Step | Math |
|---|---|
| Load | Daily kWh |
| x Hours | Backup target |
| / 0.8 | LFP usable depth |
Example
- 8 kWh/day x 1 day / 0.8 = 10 kWh nominal.
- Cover essentials only to save cost.
A lithium battery manufacturer can confirm; see our home energy storage system guide.
Frequently Asked Questions
Should I size for whole house?
Not usually – essentials sizing cuts cost and still covers outages.
Can I expand later?
Choose a modular or parallel-ready system if you might grow.
Written by Karl at China Battery Technology. Request a quote.
