Stan, it takes awhile for the AquaHot electric element to heat up the exchanger, and it isn't as good at dealing with much demand as the diesel burner is. You have to be patient and allow the electric time to heat before hitting the thermostat, and on 30 amp power, with no other appliance on, you shouldn't need the generator; even after you turn on the thermostat, the element has to work hard exchanging heat with pumped fluid. The better move is simply hitting the more efficient diesel burner switch to get things heated right away. The electric element by itself is more for maintenance of heat level, not building it up quickly. And if you notice, if you draw any hot water while your floor heaters are running, they will stop. Hot water has the priority for hydronic energy, not space heating.
For overnight, our electric element is adequate for maintaining 60 degrees or less, even on 20 amp power sources (as long as you don't have some other heavy draw on), but in the morning I often have to kick in the diesel burner for quicker warm up. You can always use your roof air's heat pump overnight, but it takes some juice. If you are in a very cold climate, the electric element likely won't be enough by itself to maintain your interior.
Sometimes you just have to burn some fuel. But as an alternative, when on adequate park power, we use a little box heater to augment the coach system, and it can easily be placed anywhere we want the most heat. Though just as noisy as the AquaHot exchangers, it can by itself maintain at 60 degrees overnight. And for sleeping, whether furnace, box heater, or heat pump, they all make noise so we keep it only in the front of the coach.
Joel
