The equivalent number of hours per day when solar insolation averages 1000 watts per square meter. For example, six peak sun hours means that the energy received during total daylight hours equals the energy that would have been received had the insolation for six hours been 1000 watts per square meter.
The equivalent number of hours per day when solar irradiance averages 1,000 w/m2. For example, six peak sun hours means that the energy received during total daylight hours equals the energy that would have been received had the irradiance for six hours been 1,000 W/m2.