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eng.solar-system-sizing Calculator
Calculates solar PV system size (kWp), battery bank capacity, and number of panels from daily energy consumption and location solar irradiance. Typical residential solar sizing uses 4–5 peak sun hours per day — battery backup sizing is based on days of autonomy at minimum load.
Inputs
Daily Energy Kwh
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
Peak Sun Hours Day
Reference formula or conversion factor shown for context.
Panel Watt Peak
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
System Efficiency Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
panels required
Sample size or count used in the calculation.
total system size (kWp)
The combined total across all inputs and components.