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Insolation data


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I am designing a solar array and need solar insolation data that is accurate and hopefully been used for similar purposes by members of this forum for correctly sizing their arrays in south africa.


I have been using a website called gaisma which has most major towns in south africa but I am not sure of its accuracy, what sources have you guys used for sizing your solar systems? The above website says that cape town has a June average of 2.5 Kwh/m^2/day and a peak in the summer months at 7.96 Kwh/m^2/day.


Regards and thanks,


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