Well, I just applied 10 Amps into a KC-125G, at 24.5 Volts, for
one hour... The current ~started~ to rise at around 21 Volts.
The KC125G serial fuse rating is 12 Amps.
This actually seems to make a great 245 Watt heater!
Ambient room temperature was 21 degrees C. The panel was a nice and
evenly toasty 33 degrees C. That's a 12 degree C (21.6 degrees F)
temperature rise.
The front area of the Sanyo HIT-195 is only about 1.25 times more than the
KC125G.
(1826.88 square inches for the HIT-195 and about 1456 sq. inches for the KC125G)
This means that 700 Watts into a HIT195 should be quite an improvement
over the 245 W into the KC125G and it might just melt some snow or
ice ~IF~ there happens to be enough energy stored (hopefully a generator)
at the site and if it's not TOO cold. The pictures of Ron's mountain
top site look like it could get REAL cold there.
I haven't tried driving a Sanyo HIT module like this before, but
assuming the I-V curves (when driving them this way) are similar
to a typical poly/mono crystalline module, that should work out
to be ~around~ a 27 degree C (48 F) rise. This ~might~ (I don't know
what the snow and/or ice does to this figure now), melt snow down to
less than a zero degree F. environment (-10 C ?). Getting even closer to
the 15 Amps series fuse limit would of course be better but run
the risk tripping the breaker.
I guess I'll just have to try this during the winter, if global warming
can hold off just a wee bit longer here in the NW.
boB
K7IQ
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
accumulation on the panels that essentially shut the system down mid
winter. Wondering if anyone has suggestions to remedy the ice
buildup. It's an extreme mountaintop environment with very high winds
at times and the ice cakes up to 2" - 3" on surfaces. There are some
pics here: www.solareagle/temp/ice.html
Access to the site in winter is totally out of the question so we are
hoping to find some ideas that might prevent or reduce the ice
accumulation. When the ice shuts the panels down the communications
go down.
Someone suggested a slippery spray like RainX might help to prevent
accumulation but I think it would quickly be washed off/worn out and
I don't know the uv issues that might reduce power output.
Ron
earthRight Solar
_______________________________________________
List sponsored by Home Power magazine
[email protected]
http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org
List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
