Re: series circuits for Sunny Boy [RE-wrenches] Check out page 458 of the Grainger No. 392 catalog.  You'll have to buy a 3 phase model and that will give you 3 sub arrays.  You can get a  Nema 3R Rainproof ST/3P 600 VDC fusible disconnect (30 amp, Square D flavor) for $401.75.

Does the Trace Tech model have a handle or do you have to open the box and remove the fuses.

And be ever so careful about trying to "educate inspectors".  Do want he wants on this job with a big smile on your face then carefully challenge him next time.  Tell him how smart he is and thank him (for making life difficult) and your life will be so much easier next time.  They are the final authority so if they feel like it they can make your life very difficult.

Travis Creswell
Ozark Solar
----------
From: "Mangelsdorf, Marco" <mmangelsdorf@hei.com>
To: RE-wrenches@topica.com
Subject: series circuits for Sunny Boy [RE-wrenches]
Date: Sun, Dec 2, 2001, 5:14 PM



Aloha Wrenches,

Does anyone know of a relatively low cost high voltage (up to 600 VDC) combiner box that has, say, two or three fuse holders?

We've finished the first Sunny Boy 2500U installation here in the islands with two parallel series-wired sets of (10) BP 150-watt 24 VDC modules.  According to a reasonable interpretation of the NEC 690-9 (b), there is no need for fuse protection of each series circuit of modules.  So, in the install, I have both sets of modules wired directly to a single pair of #10CU conductors with no fuses.  The inspection did not pass last friday with the notation being that there was no overcurrent protection on the roof, i.e., no combiner box with separate fuses to protect each series string.  I'm going to try and educate our local authorities tomorrow on the lack of need for fuses on the roof with a cover letter of my own and a two-page letter that John Berdner of SMA-America has been kind enough to supply me with.  BUT....in case I don't prevail in my education process, I'm looking for a low cost plan B.  I know that I can get a 10-circuit combiner from Trace Tech. that's rated at the high DC voltage.  But I'd like to avoid spending $400 or more bucks for it.

Any ideas?

thanks,
marco

Marco Mangelsdorf, Ph.D.
Marketing and Sales
ProVision Technologies, Inc.
69 Railroad Avenue, Suite A-7
Hilo, Hawaii 96720 USA
(808) 969-3281, fax 934-7462
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