SolarEdge Three-Phase Synergy Commercial Inverter Setup Guide for APS Mode

Key Takeaways

• SolarEdge inverters can be configured for Alternative Power Source (APS) mode to AC-couple with non-grid power sources.
• Specific firmware versions (4.8.24+ for SetApp, 3.25xx+ for LCD) are mandatory for APS functionality.
• Physical dry contact wiring and a SolarEdge grid meter are required for grid sensing and zero feedback.
• Frequency shifting (P(f)) and SunSpec Modbus settings are critical for proper operation and communication.
• For multi-inverter setups, a Leader/Follower configuration via RS485-1 is used, with the Leader handling primary control.

Configuring SolarEdge Inverters for Alternative Power Source (APS) Mode

SolarEdge three-phase inverters, including those with Synergy technology, can be integrated into systems with alternative power sources, such as hybrid inverter/chargers, to ensure continuous solar production during grid outages or in off-grid scenarios. This functionality, known as Alternative Power Source (APS) mode, is available for 3-phase and 1-phase HD-Wave inverters. The setup involves specific firmware requirements, physical connections, and software configurations for both SetApp and LCD inverter models.

Understanding Alternative Power Source (APS) Mode and its Requirements

APS mode enables SolarEdge inverters to operate in an AC-coupled setup with a non-grid power source. This allows the solar array to continue generating power even when the main grid is unavailable, provided the alternative source can manage the power flow. The core mechanism involves the SolarEdge inverter responding to frequency shifts from the alternative power source to regulate its output.

To activate and correctly use APS mode, several prerequisites must be met:

• Firmware Version: SetApp inverters require firmware version 4.8.24 or higher. LCD inverters require firmware version 3.25xx or higher.
• Grid Sensing: A dry-contact connection is necessary for sensing the grid supply.
• Zero Feedback: A SolarEdge grid meter is required to enable zero feedback, which prevents unwanted power export to the alternative power source or grid.
• Backend Parameter: It is important to contact SolarEdge Support to change a parameter in the backend to allow the frequency shifting with APS mode.

SolarEdge Inverter Configuration for APS Mode

The following table outlines the specific settings and actions required to configure SolarEdge inverters for Alternative Power Source (APS) mode, including firmware checks, physical connections, and software parameters. Distinctions are made between SetApp and LCD inverter models where applicable.

Installation Safety and Switchgear Requirements

Working with high-voltage DC and AC systems requires strict adherence to safety protocols. Before performing any physical connections or internal wiring within the inverter, ensure the following:

1. Isolation: Completely isolate the inverter from all power sources. This includes opening the DC isolator for the PV array, opening the AC breaker connecting the inverter to the grid or alternative power source, and disconnecting any battery connections if applicable.
2. Power-Down: Verify that all power indicators on the inverter are off. Wait for the manufacturer's specified capacitor discharge time before opening the inverter enclosure. This time allows internal capacitors to safely discharge high voltages.
3. Personal Protective Equipment (PPE): Always wear appropriate PPE, including insulated gloves, safety glasses, and non-conductive footwear.
4. Authorised Personnel: Opening the inverter enclosure and working on internal components, such as connecting twisted pair wires from the dry contact terminals to the L1 and V terminals of the Communication Board, should only be performed by trained and authorised service personnel. Improper handling can lead to severe injury or damage to equipment.
5. Earthing: Ensure the inverter and all associated metallic enclosures are properly earthed according to local electrical codes to prevent electric shock hazards.
6. Breaker Ratings: All AC and DC circuit breakers must be appropriately rated for the maximum current and voltage of the system to provide adequate overcurrent and short-circuit protection.

What the Published Sources Do Not Tell You

The provided documentation, while comprehensive for the specific integration with alternative power sources, does not detail several aspects commonly found in a full commissioning guide:

• Specific Models and Ratings: The document mentions "3phase and 1phase HDwave inverters" and the technical documentation refers to SE100K/SE120K models, but it does not provide specific power ratings, efficiency, or other technical specifications for these models. Users seeking detailed electrical characteristics will need to consult separate SolarEdge datasheets.
• Error/Fault Codes: No specific error or fault codes, their meanings, or troubleshooting steps are provided. This means that diagnosing issues beyond the scope of this integration guide would require referring to general SolarEdge inverter manuals or contacting support.
• General Safety Facts: The source lacks general safety information or specific safety guidelines for the SolarEdge inverters themselves, beyond the context of electrical connections. Users should always consult the official SolarEdge installation manual for comprehensive safety instructions.
• Backend Parameter for Frequency Shifting: The document notes that "it is important to contact SolarEdge Support to change a parameter in the backend to allow the frequency shifting with APS mode," but does not specify what this parameter is or how it is changed. This indicates a step that requires manufacturer intervention.
• Detailed Wiring Diagrams: While physical connections like dry contacts are described, detailed wiring diagrams are not included in the text content. Installers would typically rely on the inverter's installation manual for visual guidance.
• Victron ESS Assistance Details: The document focuses on the SolarEdge side of the integration. The full configuration steps for the Victron Energy system, including setting ESS assistance parameters, are not provided here.
• Observation Date for SolarEdge Information: The observation date for the Victron page is 2026-08-29, but the document itself references a SolarEdge feature introduced in 2019 and links to an external SolarEdge PDF. The specific observation date for SolarEdge's own documentation is not provided, meaning that firmware versions or settings might evolve. ---