Bill You do need to verify that you also have No current, l see this quite a few times where modules have failed just to find a shorted inverter or damaged conduit where one wire overheats cause unknown and the cascade is they all melt together and it's such a great short that voltage is near zero. Just a thought with fun times Jerry
On Mon, May 22, 2023, 12:25 PM Bill Battagin via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > 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 >> >> >> -- >> This email has been checked for viruses by Avast antivirus software. >> www.avast.com >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other:https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette:http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:http://www.members.re-wrenches.org > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > Virus-free.www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > <#m_-4106779750629804352_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
