Hi Bob,
I have tried this experiment on Sharp 175s. I backfed them at their
rated current, but never got any heating effect. Not sure why it didn't
work.
Best Regards,
Brian Wiley
Wiley Electronics LLC
boB wrote:
I was discussing this off-line with Ron (Copied below). I cc'd here but
I didn't quite "have it right" yet for this new list site,
so this is also a test...
He's using HIT 195 modules which, ~might~ just turn out to be ~700
Watt heating elements. I've never tried
applying this much power to a module, but it could theoretically work.
(?) The 700 Watt (approximate)
figure comes from Voc times 66% (10 Amps) Series Fuse current Rating
for these modules. I see that the
rating is 15 Amps. You could go higher in forward current but this
seems like a decent limit cuz you don't
want to trip the breaker.
I'd love to know if this actually works at melting snow and ice. What
you use for this exactly, I'm not sure....
Maybe a "Defrost " mode in some future MPPT charge controller ??
BTW, Rainex doesn't seem to keep the snow from sticking on my parked car
windshield here, but the windshield isn't vertical either.
boB
On Aug 14, 2008, at 5:53 PM, Bob Gudgel wrote:
Hi Ron... What a beautiful comm site and breath-taking view !! (maybe
one could ski back to town?)
If there were enough extra energy storage, I would try, somehow,
driving the PV modules just above their Voc (treating them like
forward biased diodes), and see if that would make enough heat
so that the ice would melt on the panels. This is something I
have long wanted to try, but just don't have a mountaintop system to
test on.
<<some snippage>>
boB K7IQ
Disclaimer: I make no guarrantees on anything using this method.
On Thu, 14 Aug 2008, Ron Young wrote:
Hi Wrenches,
I know this is a nice cool subject for these (hopefully) sun filled
days. I am working on a telecom system that has some issues with ice
<<SNIP THE COLD PART >>
Ron
earthRight Solar
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