boB,If this concept were to become a working option for the Classic, would the
modules have to be modified in any way? Why are the diodes not blocking the
reverse current?benn
DayStar Renewable Energy Inc. benn@daystarsolar.ca780-906-7807 HAVE A SUNNY DAY
Date: Mon, 16 Jan 2012 13:14:36 -0800
From: b...@midnitesolar.com
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Shedding ice
On 1/16/2012 11:39 AM, David Katz wrote:
Mark,
I believe the Midnite Classic has this feature built in.
Check with them.
David Katz
It just snowed up here in Arlington, Washington A.C. and we were
just starting to melt some snow
on a couple of modules on our roof just now with one of our charge
controllers here in the lab.
This feature is not yet in the Classic, BUT, check out this
experiment that I did about 3 years ago
in my front yard with an animated gif time lapse.
One module is being powered and the other is not powered, just
sitting there for comparison.
These are KC125s.
The time involved here was about 3 hours and took about 1 kW-hour of
energy but gives you
an idea of what may be done with this idea. One thing not in our
favor here is that the module
that is being powered is resting on the ground, in the snow, which
would significantly
hinder snow melting I would think rather than being properly
mounted.
Oh what fun it is to melt some PV snow tonight !
http://fusion.midnitesolar.com/PVsnowMelt3.gif
boB
From:
Mark Dickson [mailto:m...@oasismontana.com]
Sent: Monday, January 16, 2012 10:00 AM
To: 'RE-wrenches'
<re-wrenches@lists.re-wrenches.org>
Subject: [RE-wrenches] Shedding ice
I recall a
conversation a while back about
the possibility of “reversing” the current in a
solar module to
increase the cell temp enough to shed ice/rime.
To follow-up, has anybody
been successful at this? I am guessing, if so, it
would entail, removal
of diodes, increasing PV and battery capacity and
some way to sense the ice at
the very least. . . It sounds good in theory, but
I am skeptical as to whether
it will work in reality. . .
Best regards,
Mark Dickson,
NABCEP
Certified Solar PV Installer
™
Oasis Montana
Inc.
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