[RE-wrenches] strings of older solar panels

David Katz dkatz at aeesolar.com
Wed Nov 18 13:27:56 PST 2009


Lee
I would be inclined to use groups of 4 modules wired for 24 volts 
connected to an Enphase inverter.  This will give you less problem with 
mismatch loss. 256 watts is high but they are probably a bit lower in 
output that that.
David

David Katz

Chief Technical Officer

AEE Solar

1155 Redway Drive

P.O. Box 339

Redway, CA  95560

Tel (707) 825-1200

Fax (707) 825-1202

dkatz at aeesolar.com <mailto:david at aeesolar.com>

www.aeesolar.com <http://www.aeesolar.com/>

 

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Solar Plexus wrote:
> Hi Wrenches.
>
> I have a customer with 32 of the Solarex MSX-64 solar panels an a 
> battery-based system.  He wants to go batteryless inverter.  So I am 
> looking at  2 strings of 16 in series.    But the solar panel spec 
> sheet doesn't say anything about system voltage rating.  Can I do this?
>  If  one solar panel in the string is shaded, does it see the full 
> string voltage of around 280 volts?  Is there something in the way new 
> panels are made that makes them more able to handle this voltage, or 
> is it just that they are now tested for it?
> My guess is this request may be happenning a fair amount.  Is there a 
> reason these panels are not listed on the California GoSolr website?
>
> Lee Tavenner
> Solar Plexus
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