Featured in Brave new world – 01-2012

Let the light shine through

Solar panel cleaning: Dust, leaves, bird excrement – when they fall on your car window, they are easy to clean. But if they accumulate on your PV modules, it’s a bit tougher to wipe them off. But do you really have to? Just how much dirt actually translates into reduced performance and when do owners of solar energy installations need to get their panels professionally cleaned – and how should they do that?

Several experts agree that for the average homeowner in an urban area not close to a major pollution source, rain, wind and snow are enough to keep the panels clean. Daniela Dirnberger of the ISE Fraunhofer in Freiburg oversaw a study on urban solar panel pollution that showed the economic loss from a reduction in …

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