Make AC Power Connections to Supply and Load Panels
In each of the following steps:
- Strip the ends of the wires and insert into the corresponding Backup Gateway terminal lugs.
- Using an appropriate torque tool, tighten the lugs according to the table on the following page.
- Use copper or aluminum wire only.
- Connect the supply conductors to the Backup Gateway Supply terminals according to Conductor Connections and the accompanying table.
- Connect the home load panel conductors to the Backup Gateway Backup terminals according to Conductor Connections and the accompanying table.
- For partial home backup with Non-Backup loads under 100 A, a Non-Backup panel can be connected. Connect the conductors (L1, L2, Neutral, and Ground) from the Non-Backup panel to the Backup Gateway’s Non-Backup terminals according to Conductor Connections and the accompanying table.
Any circuits connected here will not be powered when disconnected from the grid. During on-grid operation, these circuits are still metered by the internal site metering with no additional metering hardware required.
Warning
Always ensure all
equipment is safely de-energized and locked out prior to working, to prevent risk of
electric shock. To avoid shock hazard, never power on the system without a connection to
Earth at the Gateway.
Warning
Incorrect wiring of AC
conductors presents a risk of electrical shock or damage to equipment. Before energizing
the system, ensure all connections are made correctly according to the instructions in
this document and in accordance with local wiring codes and regulations.
Refer to Appendix B: Wiring Reference for all wiring requirements and recommendations, including wire colors and gauges.
Refer to Appendix C: System Wiring Diagrams for example system wiring diagrams.
| Supply Connections | Home Load and Backup Connections | Non-Backup Connections |
|
|
|
| Terminal | Wire Gauge | Tool Size | Strip Length | Torque |
|---|---|---|---|---|
| Supply Lugs (S1, S2) | 6 AWG – 250 kcmil | 5/16 in hex | 1-¼ inch (32 mm) | 275 in-lbs (31 N-m) |
| Non-Backup Lugs (L1, L2) | 14 – 2 AWG | 3/16 in hex | ¾ inch (20 mm) | 120 in-lbs (14 N-m) |
| Backup Lugs (L1, L2) | 6 AWG – 250 kcmil | 5/16 in hex | 1-¼ inch (32 mm) | 275 in-lbs (31 N-m) |
| Large Neutral Lugs | 6 AWG – 250 kcmil | 5/16 in hex | 1-¼ inch (32 mm) | 275 in-lbs (31 N-m) |
| Large Earth Lugs | 14 AWG – 2/0 | 3/16 in hex | ¾ inch (20 mm) | 120 in-lbs (14 N-m) |
Design Considerations
Refer to Appendix G: Feature Notes for information on the Backup Gateway load shedding feature, which can be used to interrupt any 60 V circuit when operating off-grid.