Understanding the difference between running watts and starting watts is key to choosing the right size generator for your application.
Running Watts (Rated Watts)
Running watts is the continuous power needed to keep an appliance or tool operating normally once it is already running. This is the figure you should look at for devices like lights, fans, or heaters that maintain a steady power draw while in use.
Starting Watts (Surge Watts)
Starting watts is the temporary, extra "burst" of power required for a few seconds to get motor-driven products moving from a standstill. Devices like refrigerators, air conditioners, water pumps, and power tools often require 3 to 6 times their running wattage to overcome inertia and reach operating speed.
Why the Distinction Matters
When selecting a generator, you must ensure it can handle the total combined running watts of all devices you intend to power simultaneously, plus the highest single starting wattage of any one of those devices.
- Example: If your refrigerator uses 200 running watts but requires 800 starting watts, your generator must be able to handle that 800-watt surge to prevent an overload shutdown.