Storage system, 10 kW or less single line diagram
Grid-interactive storage inverter on a 40A breaker. Use this for a battery with no backup function: a grid-interactive storage inverter of 10 kW or less on a breaker in the main panel. It stops when the utility is lost.
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What the reviewer checks on this drawing
The reviewer checks the inverter nameplate rating, the busbar arithmetic, and a note that the inverter does not supply loads during an outage.
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 | Branch breakers | |
| Load | Existing loads | ||
| Circuit breaker | 40A 2P | ESS | |
| Disconnect switch | ESS disconnect | 60A non-fused, within sight of ESS | 3 #8 Cu + #10 G |
| Inverter | Storage inverter | 7.6 kW · 240V · 32A | |
| Battery | Battery | 10 kWh |
Notes on the sheet
- Inverter nameplate rating does not exceed 10 kW.
- Busbar check: 200A bus × 120% = 240A ≥ 200A main + 40A ESS breaker. ESS breaker at the opposite end of the bus from the main.
- No backup function: the inverter is grid-interactive and stops on loss of utility.
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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