MIXED PANEL ARRAY'S [RE-wrenches]

[Steve Willey, Backwoods Solar]

Unisolar has lower peak power point, because they don't fall off in heat, so
don't allow excess in the first place.  Therefore there would not be as much
boost. I would think with just 25 foot run that upgrading to correct cable
size would be more practical than converting to 24  volt PV and back to 12
volt.  Another consideration is that the boost 50 doing the conversion does
not boost or even double when module power is down at 3 or 4 amp level as in
morning or evening or with a smaller array.

Steve Willey   www.backwoodssolar.com
Backwoods Solar Electric Systems
A catalog business on a mountain
2 miles from utility lines,
powered entirely by our catalog products.
IF UTILITY POWER IS 1/2 MILE OR MORE FROM YOUR SITE,
get our free 160 page solar-electric Planning Guide/Catalog.
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Phone(208)263-4290  Fax (208) 265-4788  in Idaho, USA


----- Original Message -----
From: Travis Creswell, Ozark Solar <ozsolar at ipa.net>
To: RE-wrenches <RE-wrenches at topica.com>; <info at rvpowerproducts.com>
Sent: Monday, August 14, 2000 11:55 AM
Subject: MIXED PANEL ARRAY'S [RE-wrenches]


> Gang,
>
> I am doing some work for the USFS on small shower house system.    I need
to
> change out the charge controller, a Morningstar 30.  I have yet to have
one
> of those last more than a couple of years and don't use them anymore.
>
> The system currently is 12 volts with all 6 modules parallel on #12 wire
> going about 25 feet to the charge controller.  Needless to say the wire
was
> a little warm.    I am going to add a Trace Combiner Box and if I the a
> Solar Boost 50 turn the 6 modules @ 12 volts into 3 sub arrays at 24
volts.
>  If I use the Solar Boost 50 I can run the array @ 24 volts and keep the
> batteries at 12 volts.
> Even with the Solar Boost 50  they still need some more array though.
They
> are pretty picky about using non-breakable modules which limits me to
> UniSolar.   They currently have Duravolt 50's  (MPP 2.9 amps @ 16.56
volts)
> which are polycrystal with the clear tedlar instead of glass fronts.  Is
> MPPT going to work mixing amorphous and polycrystalline modules?  Is MPPT
as
> effective with Unisolar's as they supposedly have a much lower MPP
voltage?
>
> Thanks
> Travis Creswell
>
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For info contact list moderator by email:
 michael.welch at homepower.com
___________________________________________________________
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