Appendix B: Connecting External CTs
If the Backup Interface does not disconnect all house loads in case of an outage,
external Export/Import current transformers (CTs) must be connected to the Energy
Meter inside the Backup Interface.
Required Equipment
Two split core or flexible coil CTs (available from SolarEdge). For flexible coil CTs,
the power supply must be purchased separately.
Extension cable - a CAT5e shielded cable
To connect external CTs:
1.
Switch the ON/OFF switch of the Backup Interface to OFF.
2. Switch the inverter ON/OFF/P switch to OFF.
3. Attach the CTs to L1 and L2 wires at the service entrance point in the main service
panel. The arrow on the CTs must point to the current source.
4.
Crimp the twisted wire pair of each CT to a twisted pair of the extension cable.
Figure 15: Connecting external CTs to extension cable
5. Release the six Allen screws and remove the Backup Interface cover.
6. Pass the extension cable through the ACconduit into the Backup Interface.
7. Remove the L1 CTand L2 CT connectors from the Energy Meter.
Appendix B: Connecting External CTs 23
Backup Interface Installation Guide MAN-01-00728-1.0
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