Wrong time and date may occur if the WIT Inverter has been stored for over
one month. Fix the time and date before connecting the inverter to the grid. For
details, see 7.1 Commissioning the WIT Inverter.
3.6 Supported Grid Types
Grid connection modes for WIT 50-100K-US Storage/Hybrid Inverters are shown in Fig 3.12.
Fig 3.12 380V /400V system (Type Y/△)
3.7 AFCI Function
3.7.1 AFIC Function Description
An AFCI, or Arc-Fault Circuit Interrupter, is a solution designed to detect and mitigate the risk of
electrical arcing in a photovoltaic (PV) system, supported by intelligent arc detection algorithm.
Arcing can occur when there is a high voltage breakdown in the electrical insulation or when
conductive materials come into contact with each other. This can pose a fire hazard and damage
the system components. The AFCI continuously monitors the system for potential arc faults and, if
detected, interrupts the circuit to prevent a fire or other damage. AFCIs are required by the
National Electrical Code (NEC) in certain parts of a PV system, such as the DC side of the
inverter, to improve safety and reduce the risk of fires.
NOTE: 1. The AFCI Function of the WIT Inverter is disabled by default. If you want to enable the
AFCI, please contact Growatt support.
2. Do not wire the Maximum Power Point Trackers (MPPTs) on the DC side in parallel as it might
trigger the AFCI mistakenly.
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
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