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Updated 2026kWh → kW sizing

Solar Power Calculator — Monthly kWh to System Size | India 2026

Enter your monthly electricity units (kWh) to get a recommended solar system size (kW), estimated panel count (400W), cost, subsidy, final price, and monthly savings.

Solar system size calculator (kWh-based)

Monthly electricity units (kWh)
Tip: Find “units” on your electricity bill. 1 unit = 1 kWh.
State (sun hours)
We use planning peak sun hours for sizing (state averages).
Daily usage hours
Not used in sizing formula right now (kept for future refinement). Default 8.
Enter monthly units and click calculate.

Peak sun hours by state (planning averages)

StatePeak sun hours/daySolar grade
Rajasthan6.0A
Gujarat5.8A
Maharashtra5.5B
Karnataka5.4B
Delhi5.2B
Tamil Nadu5.3B
Uttar Pradesh4.9C
Punjab4.8C
Madhya Pradesh5.0C
Haryana5.0C

Grades: A ≥ 5.6, B 5.1–5.5, C ≤ 5.0. Real output varies by season, shading, tilt, and rooftop conditions.

How we convert monthly kWh to solar kW (simple formula)

We estimate the required system size using:System size (kW) = Monthly Units ÷ (Peak Sun Hours × 30 × 0.8)

Example: A family in Ahmedabad uses 300 units/month. Gujarat peak sun hours is ~ 5.8. So the recommended size is about 2.16 kW (planning estimate).

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