Solar system sizing
from your consumption

Estimate capacity from kWh consumption. This is a preliminary energy calculation, not a design or generation guarantee.

Enter positive values within the stated limits.

HOW TO READ THE RESULT

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Take consumption for the last 12 months and divide by 12. One seasonal month can distort the result.

Formula: annual consumption ÷ (365 × sun hours × performance ratio). The module count is rounded up.

4.5 hours and a 0.80 ratio are adjustable educational assumptions, not site data. The ratio accounts for aggregate losses. A 600 W module is an example, not a promised specification.

Matching annual generation to consumption does not mean autonomy. Seasonality, daytime load, shade, roof and connection conditions need separate analysis. An on-grid system shuts down when the grid fails.

This tool does not size the battery or inverter. Backup design needs critical-load power, starting currents and required runtime.