Andy, our all-electric Signature has a split system with two 2,800 watt pure sine wave inverters. Basically all the big loads come off the main panel with a seperate panel for inverted loads.
With this arrangement, nothing big – like air conditioners, cooktop, etc. are powered off an inverter. Like Jon said, if a converter wants to power one of more air condtioners off an inverter, much bigger inverters are needed.
Personally, I don’t hesitate to run the generator. It’s paid for, easy to service, and designed to easily power the whole coach. If I’m just warming up something quickly in the microwave, no problem, but if I’m doing real cooking, I’ll start the generator.
Down here in Tennessee in the warmer months, I’ll need to run all the air conditioners, so running the generator is very routiene when traveling and dry camping. We just got back from dry camping 5 days near Memphis, TN so the generator had a decent workout. The generator had around 200 hours on it when we bought the coach and now has well over 2,000 hours.
If we end up with a bus that has large inverters that could run an air conditoner, I’d still start the generator if the need for a large load was going to be for a significant period of time. No sense in bogging down the whimpy 500 HP Detroit Diesel with additional alternator loads. (Shields Up)