Cleaning PV Arrays [RE-wrenches]

[Dean T. Newberry]

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Hi Joel,
The modules on the Vets Center are   BP Millennia    MST50/850
BP Solar BP850I 50W Millennia 2J a-Si Module (medium voltage, integral 
frame) 47.1

cul  deant

Joel Davidson wrote:

> 
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>Dean, Do you know what brand and model solar module shattered?
>
>----- Original Message ----- 
>From: "Dean T. Newberry" <deant at dcn.org>
>To: <RE-wrenches at topica.com>
>Sent: Sunday, September 19, 2004 8:14 PM
>Subject: Re: Cleaning PV Arrays [RE-wrenches]
>
>
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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?
>>
>>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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-- 
*Quantum Energy Group*
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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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