PV and storage, hybrid inverter single line diagram
DC-coupled battery with a backup loads panel. Use this for solar with a DC-coupled battery on a hybrid inverter that keeps a backup loads panel running in an outage.
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What the reviewer checks on this drawing
The reviewer checks the busbar arithmetic with the main breaker derated to 175A, the inverter’s grid connection at 125%, and that the backup panel is isolated from the grid while the inverter is islanded.
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 | 175A 2P | Main breaker, derated from 200A | |
| Panel | Main panel | 200A bus · 120/240V | |
| Circuit breaker | Existing | Branch breakers | |
| Load | Existing loads | ||
| Circuit breaker | 60A 2P | Hybrid inverter | |
| Inverter | Hybrid inverter | 11.4 kW · 48A grid port | 3 #6 Cu + #10 G |
| Battery | Battery | 10 kWh · LFP | |
| PV array | PV array | DC-coupled · 10 kW DC | |
| Panel | Backup loads panel | 100A MLO · 120/240V | 3 #6 Cu + #10 G |
| Circuit breaker | Branch | Backed-up circuits | |
| Load | Critical loads |
Notes on the sheet
- Busbar check: 200A bus × 120% = 240A ≥ 175A main + 60A inverter breaker. Main breaker replaced with 175A; inverter breaker at the opposite end of the bus.
- Inverter grid port 48A × 125% = 60A.
- Backup loads panel is isolated from the grid by the inverter during an outage.
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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