Jeff,

If your mission in life is dry camping I see large solar panels in your future.

I may be wrong, but I think our converters design our systems for occasional overnight stop overs without shore power, but for the most part we drive energy hogs designed to provide many creature comforts.

On our coach we have internal inverter fans, but to supplement them we have an external fan that we can control, that we tend to leave on continuously because we are either charging our batteries via shore or generator power, or our inverters are taking battery power to feed our TVs or refrigerator.

I think your available battery power has a greater influence on the hours of use you get, than whether you turn off an inverter or fan. I see attempting to conserve battery power at the expense of living large akin to shifting your Maybach into neutral going down hills to save gas. I would instead look for ways to add batteries.

Crank up the generator and run the hell out of it (it probably has 30,000 hours of life or more) or take that big fat power cord and plug into 50 amp service.