calculators
Solar System Size Calculator
Estimate solar panel capacity from daily energy consumption and available sun hours. Optional panel count estimation.
Frequently Asked Questions
How is PV array size calculated?
PV array size (kW) = daily energy use (kWh) / (peak sun hours x usable system factor). A 20% loss setting uses a 0.8 usable factor.
What if I have partial sun?
Fewer peak sun hours means a larger PV array is needed for the same daily energy target. Shading and orientation need separate review.
Is this a complete solar design?
No. It does not account for shading, orientation, local weather, inverter clipping, regulations, or detailed system design.