Quick answer
An essential-load sub-panel keeps the backup project focused. It helps match battery size, inverter output, and transfer hardware to the circuits that matter most.
Circuit planning
| Circuit | Why include it | Watch out |
|---|---|---|
| Refrigerator | Food protection during outages. | Compressor surge and cycling. |
| WiFi and outlets | Remote work, phones, routers, and small devices. | Do not overload one circuit with many appliances. |
| Sump pump | Flood risk in outage-prone areas. | Surge and duty cycle can be high. |
Backup paths to compare
Generac RTS Transfer Switch 100A
Generator backup integration, Essential-load backup planning
MOQ 2 · 16d partner response
- Amperage
- 100A
- Type
- Automatic transfer
- Range
- $250-$400
Coordinate with utility and AHJ
Request partner quote Manufacturer specs
Battle Born Eco Essential 3kWh Kit
Essential-load sub-panel backup, RV-to-home crossover builds
MOQ 1 · 12d partner response
- Capacity
- 3kWh
- Use case
- Essential loads sub-panel
- Range
- $1,700-$2,400
Confirm inverter sizing
Request partner quote Manufacturer specs
EcoFlow DELTA Pro Ultra Kit
Large essential-load backup, Outage-prone regions
MOQ 1 · 18d partner response
- Capacity
- 12kWh class
- Output
- 7.2kW class
- Range
- $8,500-$11,000
Plan transfer switch and panel capacity
Request partner quote Manufacturer specsFAQ
What should go on an essential-load sub-panel?
Common choices include refrigerator, WiFi, selected lights, garage door, sump pump, medical devices, and a few outlets.
Should HVAC be on the essential-load panel?
Usually only after careful sizing. Central HVAC can dominate battery capacity and output requirements.
Is a sub-panel required for backup?
Not always, but it is a common way to make backup scope clear and avoid trying to run the entire home.