Insolation

Also known as: Solar Insolation, PSH, Peak Sun Hours

Total solar energy per unit area over a time period, measured in kWh/m². Daily insolation in kWh/m²/day is numerically equal to Peak Sun Hours (PSH). India's PSH ranges from 4.5 (northeast) to 6.5+ (Rajasthan), driving wide variation in project economics.