Not enough information to provide a reasonable answer. We would need rated HP of well pump, any other power needs that would have to be considered besides the pump power- heat in the pump house, lights, etc.... and whatever other information that might help make an informed decision.
In this particular case you will need power for the pump, possible a heat source in the pump house if you are in an area that gets freezing weather, a receptacle for service technicians to use , and a light in the pump house if it is big enough for a person to get into to service the pump and equipment. This means you will need a small electrical panel with several circuits and all that goes with it- grounding, service from the primary power source, a transfer capability, and access for whoever is going to maintain the equipment.
Bob
