Sungrow 1-Phase Hybrid Inverter Delta Grid Guide (Earth Detection)

Understanding the Delta Grid

In certain regions, the grid provides a 230V three-phase network. In such systems, the phase-to-phase voltage is 230V, and the phase-to-PE (Protective Earth) voltage is approximately 133V.

The following Sungrow 1-phase inverters support this type of grid:

• SH3.0/3.6/4.0/5.0/6.0RS
• SG2.0/2.5/3.0RS-S
• SG3.0/3.6/4.0/5.0/6.0RS

[Diagram Description: A schematic shows a Delta IT (3 x 230V) grid. Three phases, L1, L2, and L3, are depicted. L1 and L2 each show a 230V connection. L3 is connected to PE (Protective Earth), indicating a 133V potential between L1/L2 and PE.]

Required Adjustments for Delta Grid Setup

To set up the inverter for this grid type, several adjustments are necessary:

1. Ground detection must be deactivated.
2. The PE (Protective Earth) of the AC grid terminal, Backup Port, and enclosures must be solidly connected to the house's PE-bar.

[Diagram Description: An illustration shows the PE wire connection. On the left, the inverter's AC grid terminal is shown with its PE connection. On the right, the inverter's enclosure is depicted being connected to a wall plate's PE terminal using an M4 screw, with a specified torque of 1.2 N.m.]

De-activating Grounding Detection

To operate a 1-phase inverter in a 230V 3-phase system, the grounding function must be disabled. This can be performed locally via the iSolarCloud App or remotely via the iSolarCloud web interface.

Important: If Grounding Detection is not disabled, or if the inverter and Backup port are not properly grounded, the inverter will display error code 106 (E106).

Disabling Grounding Detection Locally (via iSolarCloud App)

1. Select "Local Access" on your iSolarCloud App.
2. Scan the QR-Code on your communication device to access the local WiFi and log in using the credentials "admin/pw8888".
3. Navigate through the app: "More" > "Settings" > "Operation Parameters" > "Grounding Detection".
4. Disable "Grounding Detection" and wait for the confirmation message.

[Screenshot Description: A series of mobile app screens show the navigation path. The first screen displays main options like "Home", "Run Information", "Records", "More". Tapping "More" leads to a menu including "Settings". Within "Settings", options like "System Parameters", "WLAN Configuration", "Operation Parameters", etc., are shown. Selecting "Operation Parameters" reveals sub-options including "Grounding Detection". The final screen shows the "Grounding Detection" setting with an option to "Disable" and a confirmation "Set Successfully".]

Disabling Grounding Detection via iSolarCloud Web Interface

1. Log in to iSolarCloud and select the relevant plant.
2. Click "Settings", select the inverter, and choose "Advanced Settings".
3. Within "Advanced Settings", navigate to "Power Control" and scroll down to find the "Grounding Detection" parameter.
4. Select "Close" from the dropdown menu for "Grounding Detection" and confirm the changes by clicking "Apply Settings".

[Screenshot Description: A web interface screenshot shows the configuration settings for an inverter. The navigation pane on the left includes "Settings", "Advanced Settings", "Power Control", etc. The main area displays parameters. The "Grounding Detection" parameter is visible under "Power Control", with a dropdown menu showing "Enable" and "Close". The "Apply Settings" button is visible at the bottom.]

Disabling Backup Mode

1. Log in to iSolarCloud and select the plant.
2. Click "Settings", select the inverter, and choose "Common Parameter Settings".
3. Within "Common Parameter Settings", navigate to "Power Control" and locate "Backup Mode".
4. Set "Backup Mode" to "Disable" and click "Apply Settings" to save the changes.

[Screenshot Description: A web interface screenshot similar to the previous one, but showing "Common Parameter Settings". The navigation includes "Power Control". Under "Power Control", the "Backup Mode" parameter is displayed with options to "Enable" or "Disable". The "Apply Settings" button is present.]

Important Connection Note

It is crucial to ensure that the inverter's AC grid terminal, Backup port, and enclosures are all connected directly and solidly to the house's PE-bar.

Further Information & Technician Requirements

For more detailed information, please refer to the user manual.

This manual is intended for professional technicians responsible for the installation, operation, maintenance, and troubleshooting of inverters, as well as users who need to check inverter parameters. Inverters must only be installed by qualified professional technicians.

A professional technician should possess the following qualifications:

• Knowledge of electronic, electrical wiring, and mechanical principles, along with familiarity with electrical and mechanical schematics.
• Completion of professional training related to the installation, commissioning, and troubleshooting of electrical equipment.
• Ability to respond promptly to hazards or emergencies encountered during installation, commissioning, and troubleshooting.
• Familiarity with local standards and relevant safety regulations for electrical systems.
• Thorough understanding of this manual, including all safety instructions related to operations.