Operation Modes; Waiting Mode; Normal Mode; Fault Mode - Growatt 750-S Installation & Operation Manual

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Operation Modes

8.1. Waiting mode

When the PV voltage is higher than 70V, Inverter will be powered up, and enters
"waiting" mode.
In this mode, inverter will check the system parameters. If the system is normal,
and PV voltage is higher than 80Vdc, the inverter will attempt to connect to grid.

8.2. Normal mode

In this mode, the inverter works normally and LED turns green.
Whenever the DC voltage is higher than 80Vdc, inverter converts power to grid
as generated by the PV panels;
Whenever the DC voltage is lower than 70Vdc, the inverter will work in standby
state and attempt to connect the grid. In waiting state the inverter consumes
just enough power generated by the PV panel to monitor the internal system
status;
The inverter starts up automatically when the DC power from the
PV panel is sufficient.
Information

8.3. Fault mode

The internal intelligent controller can continuously monitor and adjust the system
status. If inverter finds any unexpected conditions such as system fault and
inverter fault, the fault information will be displayed on the LCD. In fault mode the
LED turns red.
Detailed fault information refers to chapter 10 Troubleshooting.
Information

8.4. Shutdown mode

Inverters automatically stop running during periods of little or no sunlight. In
shutdown mode the inverters take no power from the grid and panel, and the LCD
and LED turns off.
If the PV string DC voltage is too low (≤ 60 Vdc) or DC switch
open, the inverter will also turn to shutdown Mode
Information
Note:For Growatt 750-S,the PV low voltage is less than 50V.
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Maintenance and Cleaning

9.1. Checking heat dissipation

If the inverter regularly reduces its output power due to high temperature, please
improve the heat dissipation condition. Maybe you need to clean the heat sink.

9.2. Checking the DC switch

Checking externally visible damage and discoloration of the DC switch. If there is
any visible damage to the DC Disconnect, or visible discoloration, contact the
installer.
Once a year, turn the rotary switch from the On position to the Off position 5 times
in succession. This cleans the contacts of the rotary switch and prolongs the
electrical endurance of the DC Disconnect

9.3. Cleaning the Inverter

If the inverter is dirty, clean the enclosure lid, the display, and the LEDs using only
clean water and a cloth. Do not use any cleaning agents (e.g. solvents or
abrasives).
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