It is the rainy season.
I am getting service calls for resi. systems with "low insulation resistance" error codes / ground faults in the PV array.
Does anyone here have a favorite or recommended tester for such jobs?
I mean the resistance tester.
I have run the DC V tests to no avail.
(measured + to gr, and - to gr in order to locate the faulty wiring/panel)
TL;DR:
Systems installed 2006 and 2013.
-One has bubbling of the back sheets on some, but not all, problem panels. Sharp brand.
No other damage or wiring problems.
Intermittent faults..... they clear within days of rain.
-On the other, I have picked up panels and cannot find any visible damage. (no crushed, nicked, chewed wires.... no gaps in MC conn.s.....no damage to panels).
Measured no voltage from panel + or - leads to panel frame....so it seems no internal panel shorts or faults.
These faults persist for weeks.
I am getting service calls for resi. systems with "low insulation resistance" error codes / ground faults in the PV array.
Does anyone here have a favorite or recommended tester for such jobs?
I mean the resistance tester.
I have run the DC V tests to no avail.
(measured + to gr, and - to gr in order to locate the faulty wiring/panel)
TL;DR:
Systems installed 2006 and 2013.
-One has bubbling of the back sheets on some, but not all, problem panels. Sharp brand.
No other damage or wiring problems.
Intermittent faults..... they clear within days of rain.
-On the other, I have picked up panels and cannot find any visible damage. (no crushed, nicked, chewed wires.... no gaps in MC conn.s.....no damage to panels).
Measured no voltage from panel + or - leads to panel frame....so it seems no internal panel shorts or faults.
These faults persist for weeks.