[RE-wrenches] Just getting old?

[Bill Battagin]

I went back to this array, removed all J-box covers and tested for Voc.  
The majority of the PVs were ~ 9.5Voc, about 5 were ~19 Voc, 3 were 0 
(that's zero) Voc .  The diodes are in an encapsulant.  The label says 
Voc = 22V. Another array of Mitsubishi panels takes a dive.

             Anybody have contact info for them or recent experience 
with their warranty?

Thanks,

Bill

Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.(shipping)
5575 Genesee Rd. (USPS, UPS)
Taylorsville, CA 95983
530.284.1925 Office/ 530.258.1641 Cell
CA Lic 874049
Solar powered since 1982

On 5/17/2023 10:25 PM, Darryl Thayer via RE-wrenches wrote:
> Was the inverter connected at the time of testing?  If so I suspect 
> the inverter is loading the solar array below Vmp
>
> On Wed, May 17, 2023 at 11:23 PM frenergy via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
>
>     Wrenches,
>
>                  I've got a call from a customer that said their (my
>     install) 17 year old GT system went dead. Basic stats: 23, Mitsubishi
>     PVMF120EC3, label says V mpp= 17.6V and Voc = 22 V; top-of-pole; SMA
>     SB3800U. Its one string of 23 PVs.  Full sun, 75 degrees ambient
>     during
>     testing. When I checked DC voltage at the inverter landings I got
>     ~23-29
>     volts (fluctuating) same at the input side of the DC switch. These
>     panels have the old gasketted 4-screw covered J-boxes and screw
>     terminals inside, I removed the covers from three panels and got 9.5
>     volts at the each of the panels' screw terminals,  all the wiring
>     outside the boxes checks out.
>
>                  The system had been functioning normally 3 weeks
>     prior. I
>     could check voltage at more panels I guess.  Ideas?
>
>     Bill
>
>     Feather River Solar Electric
>     Bill Battagin, Owner
>     4291 Nelson St.(shipping)
>     5575 Genesee Rd. (USPS, UPS)
>     Taylorsville, CA 95983
>     530.284.1925 Office/ 530.258.1641 Cell
>     CA Lic 874049
>     Solar powered since 1982
>
>
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