Battery with partial home backup single line diagram
Backup gateway and a dedicated backup loads panel. Use this for a battery added to a home to back up chosen circuits. A gateway opens when the utility is lost, and the battery carries a dedicated backup loads panel.
A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.
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What the reviewer checks on this drawing
The reviewer checks the battery output at 125% and its breaker, how the gateway isolates the backup panel, and the location, spacing and working clearances of the storage system.
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 |
| Circuit breaker | 200A 2P | Main breaker | |
| Panel | Main panel | 200A bus · 120/240V | |
| Circuit breaker | Existing | Non-backed-up loads | |
| Load | Existing loads | ||
| Circuit breaker | 100A 2P | Gateway feed | |
| Device | Backup gateway (GATEWAY) | Microgrid interconnect device, 200A | 3 #3 Cu + #8 G |
| Panel | Backup loads panel | 125A MLO · 120/240V | |
| Circuit breaker | 30A 2P | Battery | |
| Battery | AC-coupled battery | 5 kW · 13.5 kWh | |
| Circuit breaker | Branch | Backed-up circuits | |
| Load | Backed-up loads |
Notes on the sheet
- Gateway opens on loss of utility so the battery supplies only the backup loads panel.
- Battery output 20.8A × 125% = 26A, protected at 30A.
- ESS location, spacing and working clearances per the adopted fire and electrical codes.
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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