Sungrow PV Grid-Connected Inverter Quick Installation Guide

1.1 Cable Requirements

Step 1: Prepare Power Disconnection

Turn the DC switch to OFF. Disconnect the AC circuit breaker and secure it against reconnection.

[Diagram: Inverter unit with DC switch shown in OFF position and AC breaker symbol.]

Step 2: Mount the Bracket

Fasten the bracket to the wall using expansion plug sets. Drill a $\phi$10 mm hole to a depth of approximately 70 mm. Use expansion tubes, screws, washers, and fender washers.

[Diagram: Shows drilling a hole, inserting expansion tube, and fastening bracket with screw, washer, fender washer.]

(1) The expansion plug sets are not included in the delivery contents.

(2) Drill the hole with a $\phi$10 drill bit.

(3) The depth of the holes should be about 70 mm.

Step 3: Hang the Inverter

Hang the inverter onto the bracket and secure it with a screw (torque 1.5 N.m).

[Diagram: Shows inverter being hung on a wall bracket and secured with a screw.]

(1) Take enough space for convection into consideration during installation.

(2) The minimum space from the bottom is 800 mm if the communication module is equipped.

Step 4: Secure the Inverter

To protect the inverter from theft, you can lock it with a padlock. The padlock hole diameter is about 8 mm.

[Diagram: Shows a padlock securing the inverter to the bracket.]

Step 1: Grounding Connection

A second PE terminal is equipped at the bottom of the inverter. Connect the PE terminal for reliable grounding. In no case shall the second PE connection substitute for the PE connection in the AC terminal block. Be sure to connect both PE terminals for reliable grounding. Failure to comply with these requirements will void the warranty.

[Diagram: Shows PE cable connected to the inverter's PE terminal and a second PE terminal at the bottom.]

Step 2: AC Connector Assembly

Assemble the AC plug-in connector. Align the AC connector and the AC terminal and mate them together by hand until a "Click" is heard or felt.

[Diagram: Shows AC connector being plugged into the inverter terminal.]

Cable diameter (mm): Range 6...9

Step 3: PV Connector Assembly

Assemble the PV plug-in connectors, and then plug into the corresponding terminals until there is an audible click. The inverter will not function properly if the PV polarities are reversed. If the PV connectors are not assembled into place, it may cause an arc or overheat. The loss caused by this issue will void the warranty.

[Diagram: Shows PV+ and PV- connectors being plugged into the inverter terminals.]

For -S series, only one input can be connected. For -D series, the two PV inputs can be configured in independent mode or parallel mode.

For independent mode, the two PV inputs work independently, each with its own MPPT. Therefore the two PV inputs can be different from each other in PV module types, numbers of PV panels in a PV string, tilt angles and orientation angle of PV modules.

For parallel mode, all PV strings with the same type, the same number of PV panels, identical tilt and identical orientation in series can be connected to the same single input area. Two strings in parallel can connect to a DC isolator and then split into two cables which connect to each PV input.

Step 4: Meter's RS485 Connection (Optional)

Lead the A and B plugs from inside out through the connector. This will result in the cable with the RJ45 plug on the inside end, and the A and B plugs on the outside. Insert the RJ45 plug into the left (Meter) port until it makes a clicking sound. The connector is delivered with the inverter and the cable is delivered with the meter.

[Diagram: Shows meter cable with RJ45 plug connecting to the meter port.]

Step 5: DRM Communication Connection

Assemble the RJ45 plug for DRM communication, then plug into the DRM terminal until there is an audible click. Secure the waterproof lid to the inverter bottom with four screws and then fasten the swivel nut.

[Diagram: Shows RJ45 plug connecting to DRM terminal and waterproof lid being secured.]

The RS485 terminal can also be used to connect an external RS485 device. For the pin definition and waterproof procedure, please contact SUNGROW.

3.1 Inspection Before Commissioning

Before starting up the inverter for the first time, you should check the following items:

3.2 Button Function

The inverter features an LCD display panel with a screen, an indicator, and two buttons (ESC, ENT). These buttons have multiple functions:

• ESC Button: ≤1.2 s: Navigate up/down or change settings. >1.2 s: Return to previous menu or cancel settings.
• ENT Button: ≤1.2 s: Move left/right, turn pages, or view active error/warning. >1.2 s: Enter sub-menu or confirm selection/settings.

[Diagram: Shows inverter LCD screen with ESC and ENT buttons labeled.]

DO not touch hot parts (such as heat sink) during operation. Only the buttons and the optional DC switch can be touched.

3.3 Commissioning Procedure

1. Ensure all inspection items from 3.1 are met.
2. Connect the external AC circuit breaker.
3. Rotate the optional DC switch to "ON". If there is sufficient sunlight, the inverter will enter the running state and start to feed AC power to the grid.
4. Observe the status of the LED indicator.

LED Status Descriptions:

• Green Steady On: The inverter is running normally, or with a warning, or with power limitation.
• Green Blinking (once every 1 s): In the status of standby, or start up, or off via LCD.
• Red Steady On: Inverter fault.
• Red Blinking (once every 0.2 s): Grid fault.
• Orange Blinking (once every 1 s): PV fault.
• Orange Steady On: In the status of upgrading.

[Diagram: Shows the inverter's LED indicator with different colors and blinking patterns, signifying various operational states.]

4.1 Main Menu

When there is no button operation for 1 minute, the LCD backlight will be automatically deactivated. After 2 minutes, the system will return to the default menu (main screen). The main screen automatically displays through the main screen and energy, PV and grid interfaces, with each interface stayed for 2 seconds.

Main Screen Example:

Pac: 3456W

Status: Running

Menu Navigation:

Press ENT to access the main menu. Options include:

• Run Info
• Settings
• Time
• Country
• Device Info
• ON/OFF
• Error Record
• Grid Prot. Param
• Zero-export
• PF
• Param Reset
• DRM Switch
• GND Detect
• Energy Adj
• Comm. Param
• Ethernet Config (Reserved function)

[Diagram: Shows the structure of the main menu on the inverter's LCD.]

Finding Error Codes

If the LED indicator is blinking red, there are two methods to check the state and find the error codes:

• Method 1 (Inverter Screen): The current error code will be displayed on the main screen.
• Method 2 (SolarInfo Home app): If you have installed the Wi-Fi module, please connect to the inverter's Wi-Fi network started with SG- via a smart phone and then click "Direct Visit" to login. When an error occurs, the icon will automatically display on any software interface. Click the icon to view detailed information.

[Diagram: Shows an example of an error code displayed on the inverter screen, e.g., "Error xxx".]

[Diagram: Shows a smartphone screen with the SolarInfo Home app displaying an error icon.]

4.2 Advanced Settings

? Only qualified personnel are permitted to set the protection parameters. The parameter settings are protected with a password.

Accessing Settings: Main Screen (Press ENT) → Menu (Press ESC × 1) → Settings (Press ENT)

Enter Password (default: 111) and Press ENT.

Viewing Error Record: Main Screen (Press ENT) → Menu (Press ESC × 3) → Error Record (Press ENT). Press ESC to exit.