Huawei SUN2000 Series Inverters Quick Guide

1 Overview

Appearance

The inverter features a panel, LED indicators, an external fan tray, a mounting bracket, and a maintenance compartment door.

Port Description

The inverter has multiple DC input terminals (PV1-PV20) controlled by three DC switches (DC SWITCH 1, 2, and 3). It also includes reset buttons, a ventilation valve, a USB port, and communications ports.

DC Switch Description:

DANGER: The DC switches automatically turn off when a fault occurs (LED4 is steady red). Contact technical support; do not manually turn on the DC switches.

2 Installation Requirements

NOTICE: If inverters are installed in areas with abundant vegetation, harden the ground underneath with cement or gravel (recommended area: 3m x 2.5m).

Angle

The inverter should be mounted at an angle of approximately 15 degrees.

Clearance

Ensure a minimum clearance of 200 mm above the inverter and 600 mm on all other sides (front, back, left, right). A clearance of 600-730 mm is recommended underneath.

Dimensions

The inverter has dimensions of 1035 mm (width) x 700 mm (height) x 387.5 mm (depth). Mounting bracket dimensions are 969 mm x 226 mm.

3 Installing a Solar Inverter

NOTICE: Use the provided M12x40 bolt assemblies. If the length is insufficient, use appropriate M12 bolt assemblies. Remove the security Torx wrench before installation.

Installation Positions of Handles

Handles are optional and delivered separately. Ensure they are securely installed during transportation and installation. Remove them after installation is complete.

Step 1: Install the mounting bracket. It is recommended to take anti-rust measures for drilled holes.

Step 2: Install the solar inverter onto the mounting bracket.

Step 3: Tighten security Torx screws.

4 Connecting Cables

WARNING: Do not connect loads between the inverter and the AC switch. Ensure the AC switch specifications meet local standards to prevent malfunction.

CAUTION: Each inverter requires an AC output switch. Multiple inverters cannot share the same AC output switch.

NOTICE: Connect cables according to local laws and regulations. Leave sufficient slack for connections.

4.1 Preparations

NOTE: S and Sp represent conductor cross-sectional areas. Cable size must comply with local standards. Factors affecting cable selection include rated current, cable type, routing, ambient temperature, and expected line loss.

Cable Description

Note [1]: PE cable conductor specifications depend on material and conductance equivalence to IEC 60364-5-54.

4.2 Installing a PE Cable

NOTE: Connect the PE cable to a nearby ground point. Ensure equipotential connections for all solar inverters in an array. Apply silica gel or paint to the ground terminal for corrosion resistance.

Connect the PE cable to the reserved PE point using an M10 terminal, tightening to 15 N·m.

4.3 Opening the Maintenance Compartment Door

WARNING: Do not open the solar inverter panel. Turn off the AC output switch and DC switches before opening the maintenance compartment door. Take protective measures against rain/snow. Do not leave unused screws inside.

Step 1: Loosen the screws on the maintenance compartment door.

Step 2: Open the maintenance compartment door and adjust the support bar.

Step 3: Remove accessories and set them aside.

Step 4: Select a crimping module based on the AC output power cable type (multi-core or single-core).

4.4 Removing the Rubber Rings from the Crimping Module

Use scissors to cut the joints of the rubber rings. Ensure the correct rubber rings are removed according to the cable diameter range to maintain the inverter's protection level.

4.5 (Optional) Installing the Tracking System Power Cable

NOTICE: The tracking system requires an overcurrent protective device. Cable length to the protection device should be ≤ 2.5 m. Use an AC three-phase power grid. Keep flammable materials away. Protect the power cable with a conduit.

Prepare the cable end (L+3 mm) and strip it. Ensure the diameter (D) is within the specified range (15-18 mm). Connect to the inverter using an M6 screw, tightening to 6-8 N·m.

4.6 Installing the AC Output Power Cable

NOTICE: Measure cable outer diameter using the ruler sticker. Ensure the AC output power cable is secured to prevent malfunction. Provide sufficient slack in the PE cable. Obtain spare screws from the fitting bag if needed.

Multi-core Cable Connection Method

Prepare the cable end (L+3 mm). Ensure the diameter (D) matches the selected range (24-66 mm). Connect the cables (L1, L2, L3, N, PE) to the corresponding terminals (M12 for L1/L2/L3, M10 for PE). Tighten L1/L2/L3 terminals to 25-30 N·m and PE terminal to 15 N·m.

Single-core Cable Connection Method

Prepare the cable end (L+3 mm). Ensure the diameter (D) matches the selected range (14-32 mm). Connect the cables (L1, L2, L3, N, PE) to the corresponding terminals (M12 for L1/L2/L3, M10 for PE). Tighten L1/L2/L3 terminals to 25-30 N·m and PE terminal to 15 N·m.

Cable Connections

Illustrations show connections for five-core, four-core (including PE and N), and three-core cables. Single-core cable connections (including and excluding N) are also detailed, with specific diameter ranges and terminal tightening specifications (M12: 25-30 N·m, M10: 15 N·m).

Closing the Maintenance Compartment Door

Reverse the opening procedure: close the door, adjust the support bar, and tighten the M6 screws to 5 N·m.

4.7 Installing DC Input Power Cables

Selecting DC Input Terminals

WARNING: Before connecting PV strings, check PV string insulation using a 1500 V tester. Resistance should be ≥ 1 MΩ. Troubleshoot if less than 1 MΩ.

Distribute DC input power cables evenly across DC input terminals, prioritizing DC SWITCH 1. Prefer even-numbered PV terminals for MPPT connections. For 11-19 PV inputs, connect to odd-numbered terminals (PV1, PV19) and avoid adjacent MPPTs.

A table details the selection of DC input terminals for 11 to 19 PV inputs across SWITCH 1, SWITCH 2, and SWITCH 3.

Installing DC Input Power Cables

NOTICE: Use positive and negative Amphenol Helios H4 metal contacts and DC connectors. Ensure correct polarity. If voltage > 1100 V, reduce PV modules per string. If DC input is reversed, wait for low irradiance, set DC switches to OFF, and correct connections. Check connector security by pulling axially.

Connection Steps:

1. Prepare positive and negative metal contacts (8-10 mm).
2. Ensure the cable cannot be pulled out after crimping (H4TC0003).
3. Connect positive and negative connectors.
4. Use a multimeter to measure DC voltage (≤ 1100 V).
5. Ensure the locking nut is secured (H4TW0001).
6. Check connector connection with a click sound.

4.8 Installing RS485 Communications Cables

NOTICE: The inverter supports RS485 and MBUS communication. For MBUS, do not connect to the RS485-1 port. Separate communications cables from power cables.

Pin Definitions of Communications Ports

The communications port has 8 pins. RS485-1 (Pins 1-6) is for RS485 communication (IN/OUT signals, shielding ground). RS485-2 (Pins 7-8) is for RS485 slave devices.

Connecting RS485 Communications Cables

Use a 4-8 mm four-hole rubber plug. Prepare cables, ensuring diameter D is within range. Connect to the COM port using M3 screws (0.5 N·m). Use 3 N·m for the COM port connection. Illustrations show connections for one, two, or three communication cables.

Use a 4-8 mm two-hole or three-hole rubber plug. Prepare cables, ensuring diameter D is within range. Connect to the COM port using M3 screws (0.5 N·m). Use 3 N·m for the COM port connection.

5 Verifying the Installation

6 Powering On the System

WARNING: When LED2 is steady green (grid-tied), do not turn on any DC switch. This can damage the inverter due to unverified insulation resistance.

NOTICE: Before turning on the AC switch, check AC voltage with a multimeter. Do not turn the DC switch to the unloaded position.

Steps:

1. Turn on the AC switch between the solar inverter and the power grid.
2. Set DC SWITCH 1 (MAIN SWITCH) to ON.
3. Check the PV connection indicator. If steady green, set DC SWITCH 2 and DC SWITCH 3 to ON.
4. Observe LED indicators for operating status.

LED Indicators:

7 Commissioning

NOTE: Use the FusionSolar app for FusionSolar management systems and the SUN2000 app for other management systems. Apps communicate via WLAN, Bluetooth, or USB for alarm query, parameter settings, and maintenance. Download apps from the Huawei app store or scan QR codes.

NOTICE: Screenshots are for reference. WLAN initial name: Adapter-WLAN module SN, initial password: Changeme. Set a secure login password. Set the correct grid code.

Scenario in Which Solar Inverters Are Connected to the FusionSolar Smart PV Management System

1. Open FusionSolar app, log in to intl.fusionsolar.huawei.com, choose Me > Device commissioning.
2. Scan QR code or manually connect via WLAN/Bluetooth/USB.
3. Enter login password.
4. Log in and go to Quick Settings or the inverter screen.

Scenario in Which Solar Inverters Are Connected to Other Management Systems

1. Open SUN2000 app, scan QR code or manually connect via WLAN/Bluetooth/USB.
2. Enter login password.
3. Log in and go to Quick Settings or the inverter screen.

The app interface shows login, quick settings, and device monitoring options.