System kW = daily kWh ÷ peak sun hours ÷ system losses. Typical peak sun hours: India 5–6 h, UK 3 h, Australia 5 h. System losses: 15–25% (wiring, dust, inverter, temperature).
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Sizing notes
Each 1 kW of solar typically needs 70–100 sqft of roof.
Battery sizing: for grid-tie + net-metering, no battery needed. For backup, multiply daily kWh × backup days × 1.25 (LiFePO₄ DoD).
Inverter rated at ~80% of solar capacity is acceptable for net-metering (peak generation rarely hits 100%).