Cleaning PV Arrays [RE-wrenches]

[Dean T. Newberry]

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Hi Mark,
After 1-1/2 years late one evening I washed my 1kW array with citrus 
cleaner solution scrubbed with a mop, rinsed with a hose and squeeged it 
off,  the two day difference was 4%.
I don't think it is worth the trouble.

The Davis city crews used a firehose midday when the ambient was 95F. 
One of the modules shattered. Definitely not worth the trouble.

I recommend that my customers let the rain clean the modules.

cul  deant

Mark Byington wrote:

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>Do clean PV arrays operate cooler and produce more power?
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>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.
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	Dean T. Newberry
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430 D Street
Davis,  CA   95616
T:  (530) 758-6064
F:  (530) 758-3684
deant at dcn.org <mailto:deant at dcn.org>

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