Keep in mind that some older SunPower modules require positive grounding; otherwise, you can get significant PID. If it's an older SunPower system, you will want to try to find a transformer based inverter that can be positively grounded which isn't easy. There may be some other PID mitigation devices but I've never used one.
On Wed, Oct 21, 2026 at 8:55 PM Glenn <[email protected]> wrote: > I had to replace an old Fronius inverter last year and picked Solis as a > replacement. > Available, easily moved and seems to be doing fine. > > -Glenn > > On Oct 21, 2026 22:22, Howie Michaelson <[email protected]> > wrote: > > I received a call from someone who had a SunPower leased net metered > system. His inverter died in 2024 and after many calls the original > installer managed to get an ex-Sun Power employee to replace the inverter > on his own time. A refurbished inverter with a 2014 manufacturing date was > installed. > > Now the inverter is showing a "grid relay open" code, so it isn't > producing power. The remnants of SunPower say the inverter is past their > warranty (he paid for a 20 year extended warranty through the leasing > company, which is out of business). The original installer either doesn't > answer their phones or when they do answer, they say someone will call him > back, but never do. > > He now wants to pay to replace the inverter, which seems wrong. I'm trying > to decide if I want to take this on, and trying to figure out what inverter > makes sense to use. I've installed almost solely SolarEdge inverters since > 2014, so I'm largely out of the loop on other strong inverters. > > If I install a new inverter, I want to ensure it is a solid choice with a > good warranty. Any suggestions are welcome. > > Thanks, > Howie > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > > https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/ > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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 > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/ There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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
