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Can you get any data from local weather stations ? The PV output will vary approx the same as the solar irradiance - ie if that drops by 50% the output will drop by 50%. If the interuptions are likely to be short, you could provide a larger water tank (say 3 days supply or something) to compensate. But if the harmattan goes on for weeks (?) then you probably will need an alternative supply. There is quite a bit of data here which covers Africa and should show the reduction in the wet season, but I doubt if it includes things like the Harmattan.