TechnicalUp to date · Jan 15, 2026
Insolation
The total solar energy received on a surface over a period, typically measured in kWh/m²/day. Similar to peak sun hours but expressed as energy rather than equivalent hours.
Related Terms
Irradiance
The power of solar radiation received per unit area, measured in W/m² (watts per square meter). Standard peak irradiance at earth's surface is ~1,000 W/m² under clear skies at solar noon.
Peak Sun Hours
The equivalent number of hours per day when solar irradiance averages 1,000 watts per square meter. Varies by location.