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@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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