automatic washdown for PV [RE-wrenches]

[Conrad Geyser]

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I made a timed washdown / cooling sprayer as an experiment for my own array.
I was spraying momentarily for ~3 seconds every minute.  The panel temp. was 
lowered and output went up ~ 10%.
Our east coast municipal water is treated for acidity with something akin to 
lime.
There was a mineral haze that developed after several months which ended the 
experiment.
Your early morning timing should give the water a chance to drain and 
probably not have as much trouble.
good luck

Conrad Geyser
Cotuit Solar


----- Original Message ----- 
From: "Marco Mangelsdorf" <marco at pvthawaii.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, June 29, 2006 12:13 PM
Subject: soiling city [RE-wrenches]


>
>
> I've got a roof-mounted array on an essentially flat roof in an area that 
> is
> very dusty with little rainfall. I'd appreciate knowing what the estimated
> percentage reduction in output might be for such a heavily dusty area
> compared to a light soiling location. I'm thinking about rigging up a rain
> bird kind of sprinkler to hose down the 16 kW array every day for 15 
> minutes
> in the early AM hours as a way to keep the glass cleaner. Has anyone out
> there put something like that together? With the hard water in the area, I
> figure that I would need to condition the water used to hose down the 
> array
> to minimize the mineral build-up on the glass and frames.
>
> Thanks,
> marco
>
>
> Marco Mangelsdorf
> Electrical Contractor License C-26351
> 69 Railroad Avenue, A-7
> Hilo, Hawai'i 96720
> (808) 969-3281, 934-7462 facsimile
> www.provisiontechnologies.com
>
>
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