Re: [Re-wrenches] Sunny Boy SB7000US-12 relay not closing

[Jay]

You should be able to confirm the positive or negative ground with how the inverter is internally wired.  Jay On Oct 22, 2026, at 7:08 AM, Howie Michaelson <howie.michael...@gmail.com> wrote:  That's a good reminder Mac, thanks.  Can anybody definitively identify these panels? The tags have apparently faded completely. The system was installed in 2012. I'm thinking maybe BP/Solarex? I have not been to the site yet.  Thanks,  Howie On Thu, Oct 22, 2026, 7:56 AM Mac Lewis <maclew...@gmail.com> wrote: 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 <glenn.b...@glbcc.com> 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 <howie.michael...@gmail.com> 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: RE-wrenches@lists.re-wrenches.org 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/re-wrenches@lists.re-wrenches.org/ 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: RE-wrenches@lists.re-wrenches.org 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/re-wrenches@lists.re-wrenches.org/ 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 <3910.jpg> <3909.jpg> _______________________________________________ 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: 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/re-wrenches@lists.re-wrenches.org/ 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

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