To determine the generator size needed to supply the electrical demand in your home, refer to the table below:
Remember 1 kw = 1000 watts, 2 kw = 2000 watts etc. The formula for finding wattage is: volts x amps = watts.
Example: an appliance nameplate states 3 amps at 120 volts. 3 amps x 120 volts = 360 watts.
Electric motors present a special problem. They require up to three times their rated wattage to start. Example: an electric motor name plate states 5 amps at 120 volts, 5 amps x 120 volts = 600 watts. Multiply this by 3. This will show the starting watts needed. 600 watts x 3 = 1800 watts to start. Some motor nameplates will show starting watts higher in some case 9 times higher, check the nameplate. Always use starting watts, not running watts, when figuring electrical load.