Cleaning PV Arrays [RE-wrenches]

[Joel Davidson]

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Hello Mark,
Thanks for the feedback. 7% sounds about right for 4 months of urban dust
and dirt. The Sacramento Municipal Utility District (SMUD) use to give brass
hose nozzles to its residential PV Pioneers (people who volunteered their
roofs for a utility owned, customer sited 3 kW and 4 kW PV system). SMUD and
encourage them to squirt the array from the ground in the morning whenever
they felt it needed cleaning. SMUD probably got 5% more annual energy
production and the volunteers definitely felt they were participating in
making more green power.
Best regards,
Joel Davidson

----- Original Message ----- 
From: "Mark Byington" <markbyington at sbcglobal.net>
To: <RE-wrenches at topica.com>
Sent: Sunday, September 19, 2004 6:07 PM
Subject: Re: Cleaning PV Arrays [RE-wrenches]




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Do clean PV arrays operate cooler and produce more power?

We did an experiment in a suburban area and found that on two consecutive
days with essentially the same weather (clear, no wind, 85F), a 4KW roof
mounted array produced 7% more power after washing it down with a garden
hose from a ladder.  The modules had not been washed for 4 months.  We
recommend washing every 3-6 months unless it has rained.

[Non-text portions of this message have been removed]

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