1Application Note - SolarEdge Three Phase Home Backup Interface Commissioning
With SetApp Version 2.xx

Version History••Version 2 (July 2023) – Change in Figure 1Version 1 (June 2023) - Initial releaseIntroduction

The SolarEdge Home Backup solution provides backup power during grid outages. When a power outage occurs, theSolarEdge Backup Interface, Three Phase (BUI) detects the grid disconnection and within 3 seconds activates the inverter inbackup mode. The SolarEdge inverter seamlessly transitions into a backup power supply, drawing energy from the battery
instead of the grid. This ensures that essential electrical loads are supported, providing homeowners with critical electricity
during the outage.

This application note guides you through the process of adding a BUI to an existing solar system operating with a “SolarEdge
Home Hub, Three Phase” (Inverter) and a "SolarEdge Home Battery 48V” (Battery).
Figure 1 shows the SolarEdge three phase backup solution.

Figure 1 SolarEdge Three Phase Backup Solution

Before You Start••••

It is important to follow all the steps in the described order.
Make sure to connect the cables in the described order.

The BUI comes with a built-in Export/Import (E/I) meter. If a meter already exists and is installed in your solarsystem, DO NOT remove the existing meter. The following procedure will guide you on removing the externalmeter.
Make sure the communication cable is disconnected on the Inverter and BUI sides.

2Connecting the BUI to the Inverter
To commission the BUI:
1.

2.

Start SetApp, scan the QR code on the Inverter enclosure, and follow the on-screen instructions.

When prompted, upgrade the Inverter firmware to version 4.17.136 or above. Do not skip this stage!

3.

Now, tap Commissioning  Country & Grid to again select a country.

5.

Turn the switch of the Inverter to “0” and wait until the red LED is off (see Figure 2).

4.

When the Commissioning screen is displayed, tap Site Communication  RS485-1  Meter 1  Remove Meter.

Figure 2 SolarEdge Home Hub Inverter Three Phase - Controls and Connectors
6.

7.

Turn off the main circuit breaker feeding AC to the Inverter.
Turn off the DC Switch on the battery (see Figure 3).

Figure 3 SolarEdge Home Battery 48V - Controls
8.

Press the Power soft key for 3 to 6 seconds until the red LED of the battery turns off (see Figure 3).

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IMPORTANT NOTE!
Make sure all battery LEDs are turned OFF!
9.

Disconnect the DC wires of the PV strings from the inverter (see Figure 2).

10. Remove the Inverter cover – release the screws in the order shown in Figure 4.

Figure 4 Removing the Inverter Cover
11. If an existing meter is already connected to an inverter, disconnect the communication cable from the Inverter sideand the meter side.
12. Connect the communication cable between the BUI and the Inverter. Before closing the inverter, verify that all BUI
cables are connected as described in the Video clip of the BUI mounting and wiring.

Figure 5 Communication cable between the BUI and Inverter
13. Close the Inverter cover – make sure to torque the screws in order (see Figure 4).
14. Connect the DC wires of the PV strings to the inverter (see Figure 2).

Commissioning

To commission the BUI:
1.

Turn on the main circuit breaker feeding AC to the Inverter.

3.

Press the Power Soft Key on the battery for 3 to 6 seconds till all LEDs turn on (see Figure 3).

5.

Start SetApp, scan the QR code on the enclosure of the Inverter, and follow the on-screen instructions.

2.

4.

Turn on the DC Switch on the battery (see Figure 3).

Turn the switch of the Inverter to the “I” position and wait until a green LED start blinking (see Figure 3).

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6.

When the Commissioning screen is displayed, turn on the BUI Switch to “I” (see Figure 6).

Figure 6 SolarEdge Home Backup Interface (BUI)
7.

In the Commissioning screen tap Device Manager  check the box next to the Home Backup Interface  Add
Selected  check next to all the items on the screen  Continue – The recently Added Device screen shows agreen check mark indicating a successful installation  Tap the  arrow to return.
IMPORTANT NOTE!

If the inverter does not detect the BUI, follow the workaround path shown in Figure 7 .

Note that the BUI was not detected because it was mistakenly detected and removed before.

Figure 7 Detecting the Connected BUIIMPORTANT NOTE!

If the BUI connects and one of the following errors is displayed: "Battery Connection Error" or "Adding Failed"

To connect the BUI, do the following:a.

b.

Turn the Switch of the Inverter to “0” (see Figure 2).

Turn off the DC Switch on the battery (see Figure 3).

5c.

Press the Power soft key for 3 to 6 seconds until the red LED of the battery turns off (see Figure 3).

e.

Turn the Switch of the Inverter to “I” to turn on the Inverter (see Figure 2).

d.

f.

g.

h.
i.

Turn off the circuit breaker feeding AC to the Inverter and verify that all LEDs are turned off. Wait forone minute and turn the circuit breaker on again.
Turn the DC Switch of the battery to “I” to turn on the battery (see Figure 3).

Press the Power soft key to turn on the battery (see Figure 3).

Scan the QR code on the Inverter and follow the on-screen instructions.

Go to the Device Manager and verify that the following screen is shown with a green checkmark.

Setting and Testing the BUI Operation
To set and test the BUI operation:

1.

2.

From the Commissioning screen, tap Site Communication  RS485-1  Meter 1  View Status – the Meter 1
Status screen is displayed.
In the Meter 1 Status screen, make sure the Meter Status OK is displayed and tap Done.

63.

From the Commissioning screen, tap Power Control  Energy Manager  Energy Control  Maximum Self
Consumption (MSC) (or other energy control mode) Backup Configuration  Enable (Make sure backup is Enabled).

4.

Tap Backup Reserved and set the amount of battery energy (in %) that will be reserved for backup.

NOTE

An example of a backup configuration is described below:••

When there are two batteries onsite, the total available energy is 9.2kWh.

Setting Backup Reserved to 40% means that 40% of the batteries energy (9.2kWh) is reserved for backup (3.68kWh)and the rest (5.52kWh) is available for self-consumption.