Clearing The Alarm; Anti-Pid Function; Inspection Upon Delivery 4 - Growatt WIT 50K-A User Manual

3.7.2 Clearing the alarm

In the event that the WIT Inverter reports "Error 200" and the PV indicator turns red, an
arc fault might have been detected. Please perform the following steps to clear the alarm.
Step 1: Disconnect the WIT inverter from all power sources. Turn off the battery switch
and the AC output circuit breaker, then turn the DC switches to the OFF position. Wait
until the error message disappears.
OFF
ON
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.
OFF
ON
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.
13
OFF
ON
Fig 3.13
OFF
ON
Fig 3.14

Inspection upon delivery 4

Unpacking and inspection
1> Before unpacking the WIT Inverter, check the shipping box for any externally visible
damage. If any damage is found, contact the shipping company as soon as possible.
2> After unpacking the WIT Inverter, check if the scope of delivery is intact and complete.
If any damage is found or any component is missing, contact your distributor.
Check the following items:
D
I J
A
Fig 4.1 WIT 50-100K-A Scope of Delivery
B
A H I
Fig 4.2 WIT 50-100K-H Scope of Delivery
D
J
A K
Fig 4.3 WIT 50-100K-AE, WIT 50-100K-AU Scope of Delivery
F
E G H
K N O
C D E F G
J K N O
E F G H I
L M N O
P
P
P
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