Hi gang. From Julie Haugh.
Mike,
I've followed this thread with some interest, but everyone is seems stuck
in the same box. This might help solve the OP's problem.
-- Julie.
----
> Mind giving away your selected module? Or at least module Voc
and Vmp with
> temp coefficients?
>
> Phil Schneider
> Creative Energies
An alternative is
finding another panel from the same vendor that has a lower Vmp / Voc,
but the same Imp, and creating a "12 1/2 panel" string.
Recall that Imp is based on cell size (or number of paralled cells within
the panel), while Vmp is based on the number of cells in series within
the panel. Get with your module vendor and see if they can help you
find a combination of panels that will work. For example, the
KD135GX-LP and KD180GX-LP have the same Imp, but different Vmp -- they
should work well together to "tweak" Vmp and Voc from an
array. The comment that Vmp is going to go down with age is
something you need to seriously consider. If strings of 12 are
marginal now, they aren't going to be less marginal in the
future.
You may also be able to achieve better packing of the panels on the
supporting structure by adding different sized panels to the end of each
row (or in the middle or creating geometric patterns, etc) with this same
technique.
--
Julie Haugh
Senior Design Engineer
greenHouse Computers, LLC // jfh at greenhousepc.com // greenHousePC on
Skype
_______________________________________________
List sponsored by Home Power magazine
List Address: [email protected]
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
