Certainly looks like a problem with the inverter vs a wiring/panel problem.
On Apr 6, 2025, at 11:35 AM, Jason Szumlanski via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
I should mention that the other inverter also has three strings and is experiencing no faults. Neither inverter has an EGC landed in it from the array.
Tech support said if it’s landed in conjunction with the Load Out ground it causes an ‘echo’ on the grounds. Can result in erroneous Arc fault or other error codes. I think if using a separate wire trough, that trough needs to be physically far from the inverter and close to an electrode.
That's a good point. I didn't install this system, but I know for certain the PV EGC is not landed in either of the dual Sol-Ark inverters. It must be landed on a grounding terminal in a wiring trough or load center. I'll have to track that down. I'm not sure how the GE system is installed, either. Jason Szumlanski Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956 Florida Certified Electrical Contractor EC13013208 Hi Jason, SolArk tech support has told us to land the PV equipment ground directly to an electrode. ie do not land the PV ground in the inverter’s built in ground-bar. This detail wasn’t in their manuals years ago. I hope this is helpful 🤙🏼 David
If anyone is using this tester to do insulation resistance testing, I would appreciate any pointers you have.
I have used it successfully to test home run DC strings from rooftop junction boxes to inverters to check for nicks in wires and hard faults to ground or short circuits. However, I am currently facing a Sol-Ark 15K with three strings of PV that all seem to cause an intermittent DC insulation fault (F24). I have isolated each string by disconnecting the other strings at the rooftop junction box. With only one string connected to the inverter, regardless of which string it is, I will eventually get the F24 error.
Since I have ruled out the home run wiring, It appears the issue must be within the array somewhere. I would like to use the ET600 to help track it down, but I am reading conflicting information on how to properly undertake the test on each string. I know that I can disconnect the conductors between each PV string and the junction box and test each jumper wire individually while disconnected. But what about the PV module leads within the string of connected modules? I'm suspecting a pinched PV module lead somewhere, but I don't know where to start looking.
Jason Szumlanski Florida Solar Design Group
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