11 Aug '13, 7pm

Cleaning #solar panels often not worth the cost.

Cleaning #solar panels often not worth the cost.

Researchers found panels that hadn’t been cleaned, or rained on, for 145 days during a summer drought in California, lost only 7.4 percent of their efficiency. Overall, for a typical residential solar system of 5 kilowatts, washing panels halfway through the summer would translate into a mere $20 gain in electricity production until the summer drought ends—in about 2 ½ months. For larger commercial rooftop systems, the financial losses are bigger but still rarely enough to warrant the cost of washing the panels. On average, panels lost a little less than 0.05 percent of their overall efficiency per day.

Full article: http://greenbuildingelements.com/2013/08/11/cleaning-sola...

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