Commissioning

Start-Up / Shutdown Procedure

The inverter must be installed by a qualified and licensed electrical engineer, following the relevant national wiring regulations. Prior to powering on, the installation engineer must complete the following checks:

• Earth Bond Test
• RCD (Residual Current Device) Test
• Earth Leakage Tests
• Ensure the solar panel Voc voltage does not exceed 450V
• Verify battery voltage

Although the maximum allowable PV input voltage is 500V, the 450V limit provides an additional safety margin to protect the system from potential voltage fluctuations or operational variations that could cause damage.

Power ON Sequence:

1. Press the Start Button.
2. Switch on the AC.
3. Switch on the DC (PV Isolator).

Shutdown Sequence:

1. Switch off the DC (PV Isolator).
2. Switch off the AC.
3. Press the Start Button.

Information for Commissioning the Inverter

After you have successfully powered up the inverter, the inverter must be programmed and set up as per the programming feature above.

Basic Setup	Configure initial system settings.	Adjust the system’s time and date settings.	Customize the name of the inverter system and configure display brightness.
Battery Setup	Adjust battery settings such as charge limits and voltage.	Configure the type of battery used.	Configure shutdown parameters for the battery.
Li BMS	View battery information including charging, and discharging status.		Check the battery BMS is communicating with the inverter.
Grid Setup	Configure grid settings, such as voltage and frequency.	Set up the Grid Type functions, Grid Connection, and Inverter Protection.	See grid setup page.
System Mode	Select operating modes and timer settings.	Configures whether excess power is sold to the grid or limited to local loads.
Advance	Access advanced system configurations.	Configure multiple Sunsynk inverters to work together in parallel.	Allows for the configuration of Grid Peak Shaving power limits and Island Mode for off-grid operation.
Fault Code	Access system error logs and fault codes.	Familiarise yourself with common fault codes.

GDFI Fault

Before the inverter connects to the grid, it will check the impedance (effective resistance) of the solar PV+ to ground and the impedance of the solar PV- to ground. If either impedance value is found to be less than 33kΩ, the inverter will prevent grid connection and display an F24 error on the LCD. This is a safety feature designed to protect the system and ensure proper grounding.