The formula you are looking for is W = I x E. I = W/E. A = W/V.
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A 2000 watt generator at 120 volts would output approximately 16.67 amps (2000 watts / 120 volts = 16.67 amps).
watts = volts * amps--> Amps = watts/ volts therefore; 2000/220= 9.09 amps
Typically 75 amps on natural gas, 85 amps using propane. Peak amps(for less than a second) to start a big appliance, like an A/C condenser, are 130.
You will need a 50 kW generator for a single phase 120/240 volt service.
To calculate the power needed for the battery charger, you multiply the voltage (110V) by the amperage (40A) which equals 4400 watts. Therefore, a 110V generator with a capacity of at least 4400 watts or higher would be needed to power a 40 amp 12 volt battery charger.
Using 110 volt service, 5,000/110= 45 amps