SolarEdge Home Backup Interface, Three Phase

Support Information

For updates, check: https://www.solaredge.com/service/support

SolarEdge Technologies, Ltd. All rights reserved. Version: 1.2, June 2023. Subject to change without notice.

What's in the Package

• Backup Interface
• Mounting bracket
• Lower bracket

Required Tools

• Phillips screwdriver
• Drill
• Torque wrench
• 3 x Mounting screws and wall plugs
• CAT6 cable
• Level
• Watchmaker flat screwdriver
• M4, M5 Allen keys
• Pencil

Safety and Handling Instructions

[warning-symbol] Read this entire document before installing or operating the Backup Interface (also referred to as BUI). Failure to do so or to follow any of the instructions or warnings in this document can result in electrical shock, serious injury, or death, or may damage the Backup Interface and other property. It can also lead to warranty void.

[info-symbol] Do not discard this document! After installation, keep it adjacent to the Backup Interface for future reference!

Before operating the Backup Interface and inverter, ensure that they are properly grounded. The Backup Interface and inverter must be connected to a grounded, metal, permanent wiring system, or an equipment-grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead.

Opening the Backup Interface and repairing or testing under power must be performed only by qualified service personnel familiar with the Backup Interface.

[warning-symbol] This symbol on the product or in the accompanying documentation denotes a hazard. It calls attention to a procedure that, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning note until the indicated conditions are fully understood and met.

[warning-symbol] This symbol on the product denotes risk of electric shock due to stored energy. Before handling the product, wait for at least 5 seconds after disconnecting it from all sources of energy.

[danger-symbol] Before opening the covers and connecting the grid, please make sure that the main CB and the Inverters are OFF.

Main Connection Scheme

This diagram illustrates the main connections for the Backup Interface. It shows connections for Inverter communication cable, Grid (L1, L2, L3), and Load (L1, L2, L3). It also indicates the Load section and Grid section. A note specifies to connect the load's Neutral here in case regulation requires to short the neutral and PE on the load side to create PE-N.

The bottom interface of the Backup Interface features an On/Off/P switch, a Grid gland, a Load gland, and a Communication gland.

Mounting the Backup Interface

1. Select an installation location. Ensure sufficient space between the Backup Interface and other objects for secure access to all interfaces.
2. Install the mounting bracket to the wall using 2-4 screws. If using only 2 screws, use the left and right ones.
3. Hang the Backup Interface on the mounting bracket.
4. Hang the lower bracket on the hook behind the bottom glands and secure it to the wall with a screw.

Removing the Covers

[warning-symbol] It is forbidden and dangerous to open the upper section. Only the lower section is for user interface usage.

1. Using an M5 Allen key, release six screws and remove the Backup Interface front cover.
2. Using an M4 Allen key, release two screws and remove the Backup Interface internal lower cover.
3. Make sure the ON/OFF switch is in the OFF position.

Grid Connection

This section details grid connection for different topologies. It includes diagrams for TN-C-S and TT/TN-S systems. Cable specifications: Outer diameter 25-32mm, cross-section 6-16mm². Torque for connections is 6 N*m.

For TN-C-S, a "Regular Neutral" is used. For TT/TN-S, the Neutral is "Short with the Ground" (N-PE connection within the building).

A diagram shows the Home Hub Inverter, PV, BATT, and Backup Interface connected to the Grid and Load.

Load Connection

This section details load connection for TN-C-S and TT/TN-S topologies. Torque for connections is 6 N*m.

For TT/TN-S, the neutral is shorted with the ground (N-PE connection within the building).

Diagrams show the Home Hub Inverter, Backup Interface, and Backup Loads connected.

Connecting the Backup Interface

[danger-symbol] Before opening the covers and connecting the grid, please make sure that the main CB and the Inverters are OFF.

Note: If local regulations require a short between Neutral and Protective Earth on the load side (e.g., PE-N connection according to TNS, TT, and some TNC-S topologies), use the upper-right terminal for the Load Neutral. If topologies do not allow local PE-N generation (like TNC-S according to VDE 2510), use the Neutral bus to connect the load Neutral.

1. Strip 120-150mm around the external grid cable and 8mm from the internal wire insulation. If needed, crimp wire ferrules. Open the left gland marked "Grid" and insert the grid cable. Connect the ground wire first (Torque: 6 Nm). Connect wires: Ground (yellow), L1 (brown), L2 (black), L3 (gray), and Neutral (blue) to their respective terminals.
2. Strip 120-150mm around the external load cable and 8mm from the internal wire insulation. If needed, crimp wire ferrules. Open the right gland marked "Load" and insert the load cable. Connect the ground wire first (Torque: 6 Nm). Connect wires: Ground (yellow), L1 (brown), L2 (black), L3 (gray), and Neutral (blue) to their respective terminals.
3. If the system does not use the SolarEdge Home Network, connect the Backup Interface to the inverter using a CAT5E or CAT6 cable. Open the communication gland, insert the cable, and close the gland. Pull out the communication connector and connect the cable wires to G, A, B, and 12V +/- respectively. Use a twisted pair for A and B. Connect the other side of this cable to the inverter.
4. The Backup Interface includes a built-in meter. For full home backup, disconnect any other external export/import meter and remove it from SetApp. The internal meter must be configured as import/export. For partial home backup, connect and define an external meter on the main panel and configure it as the system's import/export meter.

Closing the Backup Interface

1. Using an M4 Allen key, secure the Backup Interface internal lower cover with two screws (Torque: 4 Nm).
2. Using an M5 Allen key, secure the Backup Interface external front cover with six screws (Torque: 4 Nm).
3. Now you can turn on the main CB and the inverter.

Configuring Installation

Follow these steps for commissioning:

1. Run SetApp.
2. Scan the QR code on the inverter.
3. Follow the on-screen instructions.
4. Configure the import/export meter on SetApp.

This includes sections for Power Control, Energy Manager, Backup Configuration, and Backup Enable.

Backup System Checkup

Note: Before starting, ensure the Inverter system is operating and producing with battery at above 20% State of Charge (SoC). Checking backup operation may cause a 2-3 second electricity supply failure to loads before they are powered up again. If you have loads sensitive to such interruptions, disconnect them from the load backup section. Ensure loads are evenly distributed between phases and do not exceed the inverter's rating per phase.

1. Make sure you have power from the grid and your inverter is working.
2. Check that the Battery SoC level is above 20%.
3. Ensure the "On Grid" LED is ON and no fault is detected. Turn OFF the main CB coming from the grid. Immediately after that, all home loads should shut down, and the "On Grid" LED should turn OFF.
4. Wait a few seconds until all home loads are powered up again; the LED marked "Backup" should turn ON.
5. After a few minutes of stable operation, turn ON the main CB again.
6. The "Backup" LED should turn OFF, and the "On Grid" LED should turn ON again.

LED Indications

Manually Switching to/from Grid-Connected

[warning-symbol] Only a certified installer is permitted to perform this operation.

This section describes how to reconnect the grid if the Backup Interface hasn't switched back automatically. Before operating bypass switches, ensure the ON/OFF/P switch is in the ON position. If the ON/OFF/P switch is in the OFF position, the bypass switch may malfunction.

Switching from Off Grid to On Grid:

In case the grid returns after an outage but the system is still working in Off Grid mode, use the following procedure to switch the grid back to the system:

1. Remove the Backup Interface front cover as shown in the "Removing the Covers" section.
2. Press "Bypass On" on the Manual Control panel.
3. Close the external cover.

Note: "Bypass OFF" disconnects the grid from the home. Use this switch ONLY to check if the backup system is ready for operation.