Battery added to a home with solar single line diagram
AC-coupled battery and a whole-home backup gateway. The PV system already there stays.
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 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 gateway (GW) | 200A · service rated, main breaker inside | |
| Panel | Main panel | 225A bus · neutrals isolated | 3 #3/0 Cu + #6 G |
| Circuit breaker | Branch breakers | ||
| To (continues off sheet) | To all house loads | ||
| Circuit breaker | 40A 2P | PV backfeed | |
| Inverter | String inverter | 7.6 kW · 240V · 32A | |
| PV array | PV array | 20 × 400W = 8.0 kW DC | |
| Circuit breaker | 30A 2P | Battery | |
| Battery | AC-coupled battery | 5 kW · 13.5 kWh | 3 #10 Cu + #10 G |
Notes on the sheet
- Gateway is the service disconnect. Main bonding jumper relocated to the gateway; main panel neutrals isolated.
- Busbar check: 225A bus × 120% = 270A ≥ 200A gateway main + 40A PV breaker + 30A battery breaker.
- Battery output 20.8A × 125% = 26A, protected at 30A.
- PV inverter stays on the backed-up side. Confirm with the battery manufacturer that 7.6 kW of PV is within what the battery can control when islanded.
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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