aarnold wrote:
So what will happen if I start it and I needed a hard start capacitor? Will it damage the a/c?
what hard start capicitors do is enable a lower wattage source to start an air conditioner on the starting surge which is much greater than normal running requirements. More modern rv air conditioners have this already built in. household air conditioners have more than adequate power supplies so it is not an issue. a 2800 watt Onan may not be able to give enough surge watts to start an air conditioner without the capacitor.
some time yes /sometimes no. also the higher elevation you are the less powerful the Onan generator.
what will start at sea level sometimes will not start at higher elevations.