"devildog1971".....I owned a 2005 Diplomat and only turned the inverter on when I wanted/needed to run something on 110volts. Since that coach really only had a microwave and TV that needed the inverter, I would only turn it on for the TV. I was never a fan of running the microwave on the inverter (older coaches and inverters). As stated, if you leave it on, it will take some power for it to idle.
I later added a residential refer to the Diplomat. I still didn't want to run the inverter all the time (2000 Watt Magnum), so I added a second 600 Watt Magnum inverter that ran just the refer. When I wanted to watch TV, which included powering the TV and DirecTV receiver, I would turn on the big inverter.
Fast forward, my new coach is all electric, has a bigger inverter and more batteries. It was really designed to have the inverter on all the time. I never turn mine off.
On yours, just turn it on when needed.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab