Hoar Frost [RE-wrenches]

[Peter Parrish]

I have a wild idea. Wild enough that I don't wanted any to try it until we
get a thorough discussion. 

What about short circuiting the PV strings? By definition none of the power
can be transmitted to the inverter. I don't have the electrical modeling
experience to calculate the power self-dissipated in the modules under SC
conditions. If it is enough, though, perhaps a SC cycle for a few minutes a
day would remove the hoar frost in the AM. It is an AM problem isn't it?

It might cost some $ to install shunt switches and control electronics to
create the necessary SC when needed, though. 

- Peter

Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
peter.parrish at calsolareng.com 

-----Original Message-----
From: Bob Ellison [mailto:reellison at gmail.com] 
Sent: Monday, May 19, 2008 4:42 PM
To: RE-wrenches at topica.com
Subject: [Norton AntiSpam] Re: Hoar Frost [RE-wrenches]

I wonder if Rain-ex might help? probably not but worth a try.
To far past the frost time here to try it.

Bob

On Fri, May 16, 2008 at 9:11 PM, Ezra Auerbach, DragonSun Consulting
<ezra at lasqueti.net> wrote:
>
>
> Hi Folks,
>
> I am writing to see if anyone has any tips or techniques for keeping hoar
frost build up off PV modules installed in extreme winter environments. I
know the obvious; nearly vertical tilt angle and dark frames, I'm wondering
if anyone knows any other secrets they are willing to share.
>
> Cheers,
>
>
>
> Ezra Auerbach
> DragonSun Consulting
> Lasqueti Island, B.C. V0R 2J0
>
> ezra at lincsat.com
> 250 333 8650
>
>
>
>
> --
> [Non-text portions of this message have been removed]
>
>
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