There is some scuttle about just installing regular non-isolated (transformerless) inverters with old SunPower positive grounded mods and setting the expectation with clients that there may be some losses due to PID. But, overall having a new inverter that is likely to be more reliable with monitoring might be worth it. I had heard that PID losses can be as much as 50% but I think that might be some of the very oldest SunPower mods dating back to the early 2000s. By the time 2012 rolled around, maybe the PID issue was almost gone anyway, just speculation.
I can't say we've done this yet except for a couple of Enphase projects with old SunPower mods. So far so good. Best, August On Wed, Aug 27, 2025 at 12:43 PM Richard Scott via RE-wrenches < [email protected]> wrote: > You Love Solar sells SMA SB6000U capable of positive ground systems. > https://youlovesolar.com/collections/inverters/products/sunny-boy-6000us-1 > > https://youlovesolar.com/pages/switching-from-negative-to-positing-grounding-for-older-sunpower-systems > You might try calling to see if they still do repairs. > > Richard > > On Wed, Aug 27, 2025 at 11:54 AM Travis Knipple via RE-wrenches < > [email protected]> wrote: > >> Hi all, >> I'm trying to retrofit an old SMA/Sunpower system with a + grounded Array. >> What options are out there for a new string inverter to put in these >> systems (if any)? >> Thanks, >> >> -- >> Travis Knipple >> Senior Engineer >> Hudson Solar Solutions LLC >> Rhinebeck, NY 12572 >> 518-539-8040 x408 | [email protected] >> >> PVIP# PV-111821-013612 >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> 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/[email protected]/ >> 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: [email protected] > > 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/[email protected]/ > 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 > >
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