![]() That means that over the course of a peak sun hour, a solar panel should be producing – before system losses due to temperature and other factors – at close to its specified output rating. That amount of sunlight – 1000 W/m² over an hour – also happens to be the exact amount of sunlight used to test and rate solar panels in the lab. Solar panels are only likely to receive around that much sunlight when facing directly towards the sun when the sun is at its strongest, at midday. ![]() ![]() A peak sun hour is defined as one hour in which the intensity of solar irradiance (sunlight) reaches an average of 1,000 watts (W) of energy per square meter (roughly 10.5 feet).Īnother way to put it: A peak sun hour is the equivalent of 1000 W/m² of sunlight for an hour.Ī peak sun hour represents a lot of sunlight.
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