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Hello Helen,

This is not really my area of expertise but have you considered a wind generator as your back-up power source? I believe that the winds are fairly consistent during the Harmattan but the wind-borne dust and sand particles could be a problem by causing erosion of equipment. You could also consider battery back-up but if you have reduced sunlight for prolonged periods recharging the batteries would be as much a problem as powering your pump.

regards

John