Huawei FusionSolar SUN2000 and LUNA2000 Battery Setup Guide

This guide details the setup and commissioning of Huawei FusionSolar energy storage systems, combining SUN2000 hybrid inverters with LUNA2000 modular batteries. We cover critical aspects from high-voltage DC coupling and communication to smart power sensor integration, backup functionality, and app-based commissioning, alongside essential safety protocols.

Huawei FusionSolar System Overview

The Huawei FusionSolar system is engineered for both residential and commercial solar installations, offering solutions for single-phase and three-phase applications. The system integrates SUN2000 hybrid inverters with LUNA2000 modular battery storage.

• Inverter Series: The system supports SUN2000-(2-6)KTL-L1 for single-phase installations and SUN2000-(3-10)KTL-M1 for three-phase setups.
• Battery System: The LUNA2000 battery system utilizes a modular design, supporting individual power modules up to complete multi-tower capacity. The LUNA2000-5/10/15-S0 battery models are designed for this system.

High-Voltage DC Coupling

The LUNA2000 battery system connects directly to the SUN2000 hybrid inverter. This high-voltage DC coupling ensures efficient power transfer between the battery and the inverter.

RS485 Communication Daisy Chain

Effective communication is crucial for system operation. The system is designed to communicate between the inverter, battery power control module, and smart power sensor using shielded twisted-pair RS485 cabling. This daisy-chain configuration ensures all components can exchange data reliably.

When connecting multiple LUNA2000 battery towers in parallel, configure communication cascading jumpers strictly per the installation manual. This ensures proper communication and operation across the entire battery bank.

Smart Power Sensor Wiring (DTSU666-H / DDSU666-H)

Accurate energy monitoring is provided by the DTSU666-H or DDSU666-H Smart Power Sensors. Install the smart power sensor at the grid connection point with CT arrows pointing towards household loads. This orientation ensures correct measurement of energy flow.

Backup Box Automatic Transfer

For grid resilience, the Huawei Backup Box provides automatic switchover to off-grid backup during grid failure. This ensures critical loads remain powered during utility outages.

FusionSolar App Commissioning

Commissioning the Huawei FusionSolar system is streamlined through the mobile application. You can commission inverters, batteries, and optimizers wirelessly using the mobile app via local Wi-Fi connection.

Integrated Safety Features

Huawei FusionSolar systems incorporate several safety features to protect the installation and personnel:

• Arc Fault Circuit Interruption (AFCI): Huawei inverters incorporate advanced Arc Fault Circuit Interruption for enhanced fire safety.
• Anti-Islanding Grid Relay: Integrated grid monitoring relays isolate generation from the utility grid within milliseconds during power outages. This prevents unintended power export during grid maintenance or failures.
• Protective Earthing: Ensure the inverter chassis and battery frame are securely bonded to earth using appropriately sized copper ground cable. This is a critical safety measure against electrical shock.
• High Voltage DC Safety Isolation: Before performing any service or maintenance, switch the DC isolator to OFF and wait at least 5 minutes for internal DC capacitors to discharge before opening covers. Failure to observe this discharge time can result in severe electrical shock.

Grid Code Compliance

Huawei inverters comply with international grid standards and microgeneration safety certification schemes. This ensures the system meets regulatory requirements for connection to various utility grids worldwide.