Series fuses/combiner boxes [RE-wrenches]

[Doug Wells]

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Wrenches,
I noticed a case recently where even 2 strings in parallel was in question.
I was designing a system with Sharp 185's and noticed that the Isc of two
modules exceeds the 10 amp fuse rating.  Interesting.
Doug Wells
Solar Works Inc.

-----Original Message-----
From: Gary Higbee [mailto:gary at windstreamsolar.com]
Sent: Sunday, October 31, 2004 2:00 AM
To: RE-wrenches at topica.com
Subject: Series fuses/combiner boxes [RE-wrenches]




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Wrenches,

I'd appreciate some help in determining when we need fuses or breakers for
parallel strings. For some reason I thought that two strings in parallel are
OK, but that for three and above we need to use the appropriate combiner box
with breakers or fuses. This feels too vague--especially as I am now being
asked to review and approve systems (for the Energy Trust of Oregon) with
more than two parallel circuits.

Please shed some photons on this--when do we not need and when do we need
parallel string fuses or breakers, and where does this correspond to in the
code--or make common sense?

Thanks so much!

Gary

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                     ~ Windstream Solar ~
     Gary Higbee  (gary at windstreamsolar.com)
                     (541 ) 607-1818 (Eugene)
                        (541) 954-3881 (Cell)
Solar, wind, and hydro site analysis and system design
    Components dealer and installation assistance
 Energy Trust of Oregon contracted system inspector
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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