Generator Size Checks
Will a 2000 watt generator run refrigerator, sump pump, and router?
Use the default WattSizer rule: add running watts, then model the largest startup load while the other selected loads are already running.
A 2,000 W unit is below this conservative estimate.
The peak-starting assumption is driven by 1/2 hp sump pump. With the default 20% buffer, WattSizer rounds up to the next 100 watts.
| Appliance | Running | Starting | Source note |
|---|---|---|---|
| Refrigerator | 180 W | 1,200 W | DOE appliance-use guidance says sample wattages vary by age and features; default is a conservative planning value for a modern full-size refrigerator. |
| 1/2 hp sump pump | 1,050 W | 2,200 W | Pump manufacturer nameplates and DOE reminder to verify actual labels; default covers many 1/2 hp residential sump pumps. |
| Router and modem | 25 W | 25 W | Home electronics wattage varies by device; DOE advises measuring or checking adapters for accurate values. |
Try the load yourself
Edit this scenario
| Load | Running watts | Starting watts |
|---|---|---|
Power station estimate
For battery units, the selected running load needs about 0 Wh for 8 hours or 0 Wh for 12 hours before weather, battery age, and inverter losses.
Safety check
Never operate a fuel-burning generator indoors, in a garage, on a porch, or near open windows. Use a listed transfer switch or interlock installed by a qualified electrician for home wiring, and verify actual device nameplates before buying equipment.
Generator or power station?
Fuel generators are useful for motor loads and longer outages, while battery power stations are better for indoor-safe electronics and medical-device planning. For battery sizing, this selected running load is about 12,050 Wh for 8 hours with the same buffer.
Never operate a fuel-burning generator indoors, in a garage, on a porch, or near open windows. Use a listed transfer switch or interlock installed by a qualified electrician for home wiring, and verify actual device nameplates before buying equipment.