PID recovery fixes potential induced degradation in PV modules. At night, when the array is not producing, the inverter applies a compensating voltage between the PV strings and ground. IEA PVPS reports that recovery works if PID is caught early, but it should be confirmed by monitoring. Advanced PID may take months or years to recover, and replacing the modules may be the better fix. Before enabling PID recovery, check the module manufacturer's required polarity to ground. A wrong voltage scheme can stop the function from working or even damage the modules. The Sungrow inverters report a PID abnormity state if the insulation impedance is abnormal or the function cannot run properly after it is enabled.
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default_valuec1 drafted · lead nominal 500 V
Scope: products Sungrow SG36/60CX-US
Conditions: PV string-to-ground voltage once PID recovery is enabled; can be changed in the App
sec=h44 h=c0d03f1c41fesec=h45 h=c0d03f1c41fec2 drafted · lead nominal 500 V
Scope: products Sungrow SG250HX-US
Conditions: PV string-to-ground voltage once PID recovery is enabled
sec=h61 h=4c06266c0dd2requiresc3 drafted · lead Sungrow EMU200 proposed
Scope: products Sungrow SG350HX-US
Anti-PID and PID recovery listed as optional via EMU200 on SG350HX-US
tbl=40.r14 h=79b867c21527review note: support check: partial - Passage shows Anti-PID and PID recovery is optional (EMU200) on SG350HX-US, but 'requires' is stronger than 'optional'.
c4 drafted · lead not Reactive power at night
Scope: products Sungrow SG250HX-US
PID repair cannot run at the same time as night reactive power generation
sec=h61 h=4c06266c0dd2implements c5implements c3implements c26implements c20