Finetuning the Inverter Settings

After we lowered the charge rate on the Prosine to 100 amps from 120, to keep from tripping the 20 amp breaker on the generator, we found that when the pump kicks in while charging at a high rate, the whole house blacks out for about 5 seconds. The pump is pulling about 95 amps at 12vdc, and the charger is supposed to cut back on charge rate automatically, but the starting current of the pump is putting it well over the 100 amps maximum I have set. What I need to do is get the 240vac generator circuit to the charger, and use a balancing transformer to convert to 120 vac at 30amps, or setup a cistern with my 12vdc pump, and use the jet pump on generator to fill the cistern when rainfall has not been sufficient.