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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