SolarEdge Commercial Three-Phase Inverter AC-Coupling Setup for Alternative Power Sources

Key Takeaways

• SolarEdge's Alternative Power Source (APS) mode enables AC-coupling with non-grid sources like inverter/chargers, maintaining solar production during outages.
• Ensure your SolarEdge inverter firmware is at least 4.8.24 (SetApp) or 3.25xx (LCD) before attempting APS mode configuration.
• The primary source for these integration steps is a community-contributed guide, not official SolarEdge documentation, which may affect specific implementation details.
• Complex multi-inverter setups or scenarios involving specific model electrical ratings should be handled by qualified solar professionals.

Configuring SolarEdge Commercial Three-Phase Inverters for AC-Coupling with Alternative Power Sources

SolarEdge commercial three-phase inverters, including models within the SE50K to SE100K series, can be configured for AC-coupling with alternative power sources. This setup utilises the "Alternative Power Source mode" (APS) feature, allowing continuous solar energy production even when the main grid is unavailable or in off-grid environments. This guide details the necessary firmware updates and communication settings for integrating these inverters with non-grid power sources.

Understanding Alternative Power Source (APS) Mode and Frequency Shifting

When a solar inverter operates alongside a non-grid power source, such as a battery inverter/charger system, it can encounter voltage and frequency fluctuations that exceed its standard grid-tie trip setpoints. The SolarEdge Alternative Power Source (APS) mode addresses this by enabling an extended frequency and voltage operating range. It also incorporates frequency-power and voltage-power droop functions, which are specifically designed for off-grid scenarios.

This mode allows the SolarEdge inverter to dynamically adjust its power output based on the frequency signalled by the alternative power source. For instance, if the alternative source detects an overproduction of power and its battery bank is full, it can increase the AC frequency. The SolarEdge inverter, configured with frequency shifting parameters, will then reduce its output in response to this frequency increase, preventing overcharging or system instability. This coordinated response ensures stable operation and continuous solar generation within the limits of the alternative power source.

SolarEdge APS Mode Configuration Steps

The following table outlines the settings and actions required to configure SolarEdge commercial three-phase inverters for Alternative Power Source (APS) mode. These steps cover firmware requirements, physical connections, and software configurations for both SetApp (screenless) and LCD inverter models.

Installation Safety and Switchgear Requirements

Working with commercial three-phase solar inverters involves high DC voltages from the PV array and high AC voltages (standard distribution voltages) from the grid or alternative power source. Incorrect installation or maintenance can lead to severe injury or death.

Mandatory Safety Procedures:

1. Isolation: Before performing any wiring, configuration, or maintenance inside the inverter, ensure complete electrical isolation. This includes opening the AC circuit breaker from the main distribution board, opening the DC disconnect switch for the PV array, and disconnecting any battery or alternative power source.
2. Verify De-energisation: Use a suitable voltage tester to confirm that all AC and DC terminals are de-energised before touching any internal components.
3. Capacitor Discharge: Allow sufficient time for internal capacitors to discharge after power-down, as specified in the inverter's manual.
4. Personal Protective Equipment (PPE): Always wear appropriate PPE, including insulated gloves, safety glasses, and arc-flash protective clothing when working with electrical systems.
5. Earthing: Ensure the inverter chassis and all associated metallic enclosures are properly earthed according to local electrical codes.
6. Authorised Personnel: All installation, commissioning, and maintenance procedures must be performed by qualified and authorised electricians or solar technicians. Opening the inverter enclosure is typically authorised-service work.

Specific DC breaker ratings, AC breaker ratings, and detailed earthing requirements for the SolarEdge SE50K to SE100K series are not provided in the available source material. Always refer to the specific inverter model's official installation manual for precise specifications and local regulatory compliance.

What the Published Sources Do Not Tell You

The available information for SolarEdge commercial three-phase inverters, particularly concerning the SE50K to SE100K series, has several notable gaps:

• Specific Model Electrical Ratings: There are no detailed electrical ratings for the SE50K to SE100K models, such as maximum AC power, maximum DC input voltage, current ranges, or efficiency figures.
• Error Codes and Troubleshooting: The source does not provide any error or fault codes, their meanings, or corresponding troubleshooting steps.
• Integrated DC Safety Switch and SafeDC: Information regarding the integrated DC Safety Switch, rapid shutdown functionality, or SolarEdge's SafeDC feature is not present.
• Official SolarEdge Documentation: The primary source for the configuration details is an integration guide from Victron Energy, not an official SolarEdge manual or datasheet. This means certain nuances or official procedures might differ.
• Detailed Wiring Diagrams: While conceptual diagrams for integration exist, detailed internal wiring diagrams or terminal layouts specific to the SE50K-SE100K series are not provided.
• Physical Specifications: Details such as physical dimensions, weight, IP rating, or operating temperature ranges are not available.
• Warranty or Service Procedures: Information on warranty conditions or specific service procedures is not included.

Users should consult official SolarEdge documentation or a certified SolarEdge installer for comprehensive details on these unaddressed aspects.