A 1hp pump at 120v will pull about 9-10 amps and should easily "run" with a 3kw generator. However, depending on the starting load, the initial current inrush for the first second or so of start-up can easily be 6-10x the load current and not all generators/motors for a 3k generator set have the ability to handle the starting current in-rush. Bear in mind that many deep well submersible pumps are 300 feet or more from the power source and voltage drop may be a factor in extending the start time for the motor/generator circuit breaker. My Honda 3500 watt portable will start my 1hp deep well pump at 220v quite well (no pun intended) if the generator is connected directly to the pump i.e. no other loads are present.
PS: always disconnect the utility wiring to any household device or use a 3-way manual transfer switch to prevent your generator from becoming toast if the utility power is suddenly restored. Best to have a knowledgeable electrician install the switch or show you how to safely disconnect the power if you do not know how to do it already.
PS: always disconnect the utility wiring to any household device or use a 3-way manual transfer switch to prevent your generator from becoming toast if the utility power is suddenly restored. Best to have a knowledgeable electrician install the switch or show you how to safely disconnect the power if you do not know how to do it already.
Last edited:
.
