Washing Machine Wattage for Generator Sizing
About the Washing Machine
A standard household top-loading or front-loading washing machine. The running wattage covers the motor driving the agitator or drum during wash and spin cycles, while the starting surge occurs when the motor first engages, especially during the high-speed spin cycle. Modern high-efficiency front-loading machines may draw slightly less. Washing machines are typically included in whole-house generator sizing but are considered non-essential during short-term outages. For extended outages, laundry capability becomes more important.
Generator Sizing for a Washing Machine
Running a washing machine by itself requires a generator with at least 1,500 W of capacity (2 kW), which includes a 25% safety margin. However, you rarely run a single appliance on a generator. When combined with other appliances, the washing machine contributes 500 W to the continuous running load and adds a potential 700 W starting surge gap when its motor starts.
The washing machine is an inductive (motor-driven) load with a starting surge of 1,200 W, which is 2.4 times its running wattage. This starting surge occurs for a fraction of a second when the motor first engages and must overcome inertia to begin rotating. Your generator must be capable of delivering this peak wattage even though it only lasts briefly. If the washing machine has the largest starting surge gap of any appliance in your generator load, its surge gap of 700 W will be the primary driver of your peak demand calculation. Avoid starting the washing machine at the same time as other large motor loads to prevent generator overload.
To determine the total generator size you need, use our interactive calculator to combine the washing machine with your other appliances. The calculator automatically handles the starting surge calculation and applies the 25% safety margin to give you an accurate recommendation. Alternatively, browse the scenarios below to see common generator setups that include the washing machine.
Scenarios That Include Washing Machine
The following pre-calculated generator scenarios include the washing machine in their appliance list. Each scenario shows the total generator size needed for all appliances in the set, not just the washing machine alone. Click any scenario to see the full appliance breakdown.
| Scenario | Total Appliances | Running Watts | Recommended Size |
|---|---|---|---|
| Whole House Full Coverage | 10 | 9,425 W | 15 kW |
Tips for Running a Washing Machine on a Generator
When running the washing machine on a generator, the most important consideration is the starting surge. Before starting the washing machine, check that no other large motor-driven appliances are starting simultaneously. Stagger your startups: let the washing machine reach steady-state operation (usually within 1-2 seconds) before starting the next motor load.
If the generator struggles to start the washing machine (indicated by the generator bogging down, lights dimming significantly, or the appliance failing to start), it likely means the generator's peak surge capacity is insufficient. Try reducing other loads before attempting to start the washing machine again. If the problem persists, you may need a larger generator with more surge capacity.
Modern inverter generators handle motor starting surges particularly well due to their electronic power management. If you are purchasing a new generator specifically for loads that include the washing machine, verify that the generator's peak (starting) wattage specification meets or exceeds the 1,200 W starting requirement plus the running wattage of all other connected appliances.
Washing Machine Wattage Compared to Similar Appliances
The following table compares the washing machine to other appliances in the laundry category. Understanding relative power requirements helps you make informed decisions about which appliances to prioritize on your generator and where you might find opportunities to reduce your total load.
| Appliance | Running Watts | Starting Watts |
|---|---|---|
| Washing Machine (this appliance) | 500 W | 1,200 W |
| Electric Dryer | 5,400 W | — |
| Gas Dryer | 700 W | 1,800 W |
Frequently Asked Questions
How many watts does a washing machine use?
A washing machine uses approximately 500 watts of continuous (running) power during normal operation. It also requires 1200 watts of starting (surge) power when the motor first turns on, which is 2.4 times the running wattage. This starting surge lasts only a fraction of a second but your generator must be capable of delivering it.
What size generator do I need to run a washing machine?
To run a washing machine by itself, you need a generator rated for at least 1,500 W (2 kW), which includes a 25% safety margin above the starting wattage of 1200W. However, most people run additional appliances alongside the washing machine, so your actual generator needs will be higher. Use our calculator to add your other appliances and get a comprehensive recommendation.
Can I run a washing machine on an inverter generator?
Yes, a washing machine can run on an inverter generator as long as the generator's peak (starting) wattage capacity meets or exceeds 1200 watts. Inverter generators handle motor starting surges well and provide clean power that is safe for the electronic controls found in many modern washing machine models. Verify the inverter generator's surge rating in the specifications.