message disappears.
Step 2: Troubleshooting. Check if the open-circuit of all PV strings are within the permissible
range.
Step 3: After the fault is rectified, restart the inverter. Turn on the battery switch and the AC
breaker, and turn the DC switch to the ON position. Wait until the system is working properly.
If the WIT Inverter passes the AFCI self-test, it will work in the normal mode and the PV
indicator will be green. If it fails, the inverter will report “Error 425”. In this case, please reboot
the system and perform Step 1 to Step 3. If it failed again, please disconnect all power sources and
contact Growatt support.
3.8 Anti-PID Function
PID refers to the potential induced degradation. It occurs when a large amount of charge
accumulates on the surface of the PV modules, causing the surface passivation to deteriorate. This
leads to a decrease in the fill factor, open-circuit voltage, short-circuit current, and the power
output of the PV modules. The Anti-PID function enables the WIT Inverters to mitigate the PID
effect by rectifying and boosting the AC voltage or battery voltage during nighttime to generate a
DC voltage. The DC voltage is connected to the PV positive terminal and the ground, applying a
positive bias to reverse the PID effect and extend the service life of the PV modules.
NOTE: The Anti-PID function is optional.
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