Mode Of Operation; Waiting Mode; Operating Mode; Fault Mode - Growatt WIT 50K-A User Manual

7.2.2.2 Set the Date & Time Automatically
Connect the WIT Inverter to the server following the procedure specified in Section 8.1.2
when the inverter is powered on, then the WIT Inverter will update its date and time
automatically.

7.3 Mode of operation

7.3.1 Waiting Mode

When the PV voltage is greater than 180V, the WIT Inverter will be powered on and enters
the waiting mode.
In waiting mode, the WIT Inverter performs self-check. If the system is normal and the
voltage is greater than or equals to 195V, the WIT Inverter will be powered on.

7.3.2 Operating Mode

7.3.2.1 Operating Mode of WIT 50-100K-A, WIT 50-100K-AE and WIT 50-100K-AU
Standby mode: The WIT Inverter enters the standby mode when the operating
requirements are not met.
Charging mode: Charge the battery from the grid (the AC Charging function should be
enabled) You need to set this mode manually and configure the charging period and
charging power.
Discharging mode: The battery discharges to supply power to the AC side
You should set this mode manually and configure the discharging period and discharging
power.
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NOTE:
1. It is recommended to charge batteries with grid power during off-peak times and
discharge battery power during peak hours to lower your electric bills.
2. The working modes listed above are applicable to the grid-tied power system. For the
off-grid system, the WIT Inverter converts battery power to power the loads.
7.3.2.2 Operating Mode of WIT 50-100K-H, WIT 50-100K-HE and WIT 50-100K-HU
Load First:
When the WIT inverter works in the Load First mode, the WIT storage unit controls the
battery to charge and discharge according to the amount of electricity fed into the grid
and drawn from the grid. When there is electricity fed into the grid, the WIT inverter
adjusts this part of electricity to charge the battery, reducing the amount of electricity
fed into the grid; when there is power from the grid, the WIT inverter adjusts the battery
discharge to reduce the amount of electricity drawn from the grid. When the WIT inverter
disable the Load First mode, it does not respond to the change of the power fed into the
grid and taken from the grid. It will keep the battery power, and enters other priority
modes.
Battery First:
When the WIT inverter works in this mode, the battery will ignore the forward and
reverse current power and give priority to charging the battery. The user needs to set the
mode ON and OFF time. lf the customer does not enable AC CHG (AC power grid
charging function), the WIT will charge the battery through PV power. If the customer
enables AC CHG, the WIT will charge the battery through PV panel and the grid.
Grid First:
When the WIT inverter works in the Grid First mode, the load will be powered firstly, then
export power to the grid. The user can choose to work in this mode when the electricity
rate is high, and the user needs to set the on and off time of the mode.

7.3.3 Fault Mode

The intelligent control system of the WIT Inverter monitors and adjusts the system status
in real time. When an alarm/fault is detected, the corresponding indicator will turn red
and the OLED will display the error message. After the fault or alarm is cleared, the
system recovers and all status indicators will be steady green.
NOTE: For details about faults and alarms, please see 9.2 Troubleshooting.

7.3.4 Shutdown Mode

When the battery SOC is lower than the discharge cutoff SOC and the PV string output
power does not meet the requirements for grid-tied power generation, the WIT Inverter
will automatically shut down. In shutdown mode, the inverter still consumes a small
amount of energy (PV>Grid>Battery) while waiting to start up again when the operating
requirements are met.
NOTE: When the DC input voltage is less than or equal to 150Vdc or the battery voltage
is lower than 600V, the WIT Inverter enters the shutdown mode automatically.
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