Have you tried shorting the strings individually? Otherwise short each module individually and record the current.
On Sat, Jul 2, 2016 at 4:50 PM, frenergy <[email protected]> wrote: > I just came upon a small off-grid system: 12 volt, 4, Kyo 120's (I,mppt= > 7.1A; Voc = 21.7 or so), Trace C40 with display, etc. The combiner has > fuses for each PV/landing. At noon, output of the array is 10.5 amps. > Clamping the 4 pvs I get 5.5 amps on 2 PVs and 0.0 on 2 others. I > disconnect leads from terminals in PV j-box of the 'dead' PVs and I get > Voc=18.5 (pretty hot day) and Isc= 6 amps. However when I reconnect these > same PVs to the combiner there is no change in combined amps. Fronts and > backs of PVs look good, no burns, browns, bubbles in backsheet, under the > glass looks fine, its all good. Inside the J-boxes look perfect/new. > Ideas? > Thx, > Bill > > Feather River Solar Electric > Bill Battagin, Owner > 4291 Nelson St. > Taylorsville, CA 95983 > 530.284.7849 > CA Lic 874049 > www.frenergy.net > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > -- Chris Mason NABCEP Certified Solar PV Installer™ Solar Design Engineer Generac Generators Industrial technician www.cometsolar.com <http://www.cometenergysystems.com> 264.235.5670 869.662.5670 Skype: netconcepts
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