Solar + Battery + Inverter Sizer
Complete off-grid system in one shot
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Solar + battery + inverter sizer
How to use this tool
- 1
Enter daily kWh + climate
- 2
See system size
- 3
Compare costs
Frequently Asked Questions
Off-grid sizing rule?
Daily kWh × 1.3 (efficiency loss) ÷ peak sun hours = panel kWp. Battery: 2 days autonomy × daily kWh / depth-of-discharge.
Peak sun hours?
Phoenix ~6.5h, Berlin ~3.0h, London ~2.7h, equator ~5.5h. Cloudy regions need bigger arrays.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.