Battery with whole-home backup switch single line diagram
Meter-socket backup switch islands the whole panel. Use this where the battery backs up the whole panel through a backup switch mounted at the meter socket.
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What the reviewer checks on this drawing
The reviewer looks for utility approval of the switch at the meter socket, the busbar arithmetic on the 225A bus, and the storage output at 125%.
What the drawing shows
Every device on the sheet, in the order power reaches it.
| Symbol | Label | Rating or detail | Conductors feeding it |
|---|---|---|---|
| Utility source | Utility service | 120/240V 1φ 3W | |
| Meter | Utility meter | 200A socket | Service conductors, per utility |
| Device | Backup switch (BACKUP SW) | Meter-socket mounted · 200A | |
| Circuit breaker | 200A 2P | Main breaker | |
| Panel | Main panel | 225A bus · 120/240V | |
| Circuit breaker | Existing | All house loads | |
| Load | Existing loads | ||
| Circuit breaker | 60A 2P | ESS | |
| Battery | Battery with integrated inverter | 11.5 kW · 13.5 kWh | 3 #6 Cu + #10 G |
Notes on the sheet
- Busbar check: 225A bus × 120% = 270A ≥ 200A main + 60A ESS breaker. ESS breaker at the opposite end of the bus from the main.
- Backup switch requires utility approval for installation at the meter socket.
- ESS output 48A × 125% = 60A.
Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.
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