William,
The 240s are 60-cell, so 60 X 9 = 540 cells. The 175s are 72-cell,
so 8 X 72 = 576 cell, or 1/2 module's worth (12V nominal) of
unmatched. I'd be cautious, but have never tried this.
On 1/15/2011 11:50 AM, William Miller wrote:
Friends:
I have a client with a Xantrex GT2.8 inverter. Feeding it are 8
Solar World SW175 modules. This is half the modules that this
inverter can handle. The client wants to realize the full
potential
of this inverter. Adding 8 additional SW175 modules would be
ideal,
but they are no longer manufactured.
I need to find a group of modules to match the 175s. I am
contemplating 9 SW240s. The specifications for this match up are
below. I imagine the IV curves are similar for these two modules
as
they are the same chemistry and the same manufacturer.
8-SW175 9-SW240
Voc 403 382
Vmp 283 275
Imp 4.95 7.87
Pcsi 1252 1715
Ptotal 2.967
Might this match be close enough? I know this over-powers the
inverter slightly. I imagine that the Xantrex will self
regulate
this very rare over wattage condition.
Comments?
William Miller
Please note new e-mail address and domain:
William Miller
Miller Solar
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email: [email protected]
http://millersolar.com
License No. C-10-773985
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