Pretty much all of us in the vanlife/overland space run Lithium batteries now, the smallest of which is basically 100Ah. I'm just about to put either 300Ah or 400Ah into my new Jeep camper to run an induction cook top, water pump, hot water, lights, charging and a lot more.

I also just mounted 600W of solar on the roof.

The power needs of Starlink is a tad annoying, but certainly not a deal breaker for anyone living in a vehicle that actually needs internet anywhere on the planet.