Solar photovoltaic solutions often begin from an adequate estimate of the energy generation capacity from the solar resources in a given site. Thus, the solar resource available in a geographical location is a deciding factor for estimating the energy generation capacity of a solar module.
Usually, the lowest month kWh/m2/day value is the starting point. Sometimes, the average number of sun hours per day is taken to be equal to kWh/m2/day as shown in the graphs below. It is typically between about 5 and 6 kWh/m2/day). That is equivalent to 5 – 6 hours of 1000 W/m2 sunlight every day for many geographical locations. However, the daily sun hours must be adjusted for other factors to obtain the actual energy generation capacity.
Some of these factors are presented as follows. The correction factors include:
The total correction factor = 0.85 X 0.95 X 0.90 X 0.95 X 0.90 = 0.62
The actual energy generation capacity = 0.62 X Wp rating. That is, for every Wp capacity in the solar module, we can expect to get an average of 0.62 X Wp Wh/day during the lowest solar month (or design month).
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