Off-Grid Solar System Sizing Guide
Off-grid solar needs a different sizing method because the grid is not there as backup. You need enough panels, usable battery capacity, inverter power, and backup margin for cloudy periods.
Short answer: start with daily kWh, then size battery days first and solar recharge second.
Core Sizing Inputs
- Daily kWh for essential and normal loads.
- Backup days for cloudy weather.
- Battery usable capacity and depth of discharge.
- Inverter size for peak appliance loads.
- Generator or grid fallback, if any.
Best Next Step
Use Battery Sizing first, then run Panel Count for solar recharge.
Next step: size off-grid backup before you size panels.