[RE-wrenches] PV output but no power

Sat Jul 2 15:54:42 PDT 2016

The dates of the defective KC-120-1 (and KC-80-1) are from late 1998 to Dec. 2002. Any modules in the date period will be replaced at no cost by Kyocera. Talk about amazing commitment to the customer, these modules only had a 1 year defect warranty. 15 years later and they are still replacing them with remanufactured units. 

Bill, the typical failure is Voc of about 10 volts. However, the failure can be intermittent. For this reason, any modules in the date period should be replaced even though they appear to test OK.

Larry Crutcher
Starlight Solar Power Systems

On Jul 2, 2016, at 3:17 PM, Mac Lewis <maclewis1 at gmail.com> wrote:

Kyocera had a batch of 120s and 85s that had bad solder connections from a certain year. I'm not remembering the year at the moment but we are still finding them.

Kyocera has been really amazing about honoring the warranty.

On Jul 2, 2016 2:52 PM, "Jerry Shafer" <jerrysgarage01 at gmail.com <mailto:jerrysgarage01 at gmail.com>> wrote:
Wrenches
Bypass diods fail and may short 
Jerry

On Jul 2, 2016 1:49 PM, "frenergy" <frenergy at psln.com <mailto:frenergy at psln.com>> 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 <tel:530.284.7849>
CA Lic 874049
www.frenergy.net <http://www.frenergy.net/>        

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