[RE-wrenches] [Fwd: Re: ice accumulation]

[Brian Wiley]

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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