It all depends on the electric motor, and with all the different type of electric motors, means a different formula needed for each variant. With most electric motors the starting current can be several times the rated full load current, which means a generator size of larger capacity than the rated output of the electric motor is needed. For example, induction type motors (capacitor start / capacitor run) require additional current to start, but on the other hand, motors fitted to hand tools generally do not require any additional start up current. Please don’t hesitate to contact us to work out what size generator is needed to start your electric motor.