Good question
What’s the age of the panels?
Jay On Aug 29, 2025, at 5:42 PM, August Goers via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
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
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