Battery Bank Calculator

Calculate the battery capacity needed for your solar system based on daily usage and autonomy days.

Results

Visualization

How It Works

Battery bank sizing accounts for your daily usage, desired autonomy days (how long you can run without sun), depth of discharge (DOD), and inverter efficiency. Lithium batteries allow 80-95% DOD while lead-acid should stay at 50%. Two autonomy days means your batteries can power your home for 2 full days without any solar input.