Our 2020 Navion, that we bought used last year, has 300w of solar and 220 A/H of lithium batteries. Last fall, we decided to test our boondocking capability. We camped for 3 days at a 9000' high Colorado campground without hookups that was open and sunny. Had plenty of power for the 12v fridge, furnace, induction cooktop, convection-microwave, TV, water pump, Truma water heater, lights, etc. Never had to run the generator or start the engine..
A week later, we camped for 3 days at a 10,000' high, no hookup, completely tree-shaded Forest Service campground. We used all the same appliances as the first trip, but had both the shade and near-freezing nighttime temps. We only made it to the second evening before the batteries ran out of juice and we had to run the generator. Interestingly, the next morning we talked to the retired single woman camper across the road. She had a portable set of solar panels set at the optimum fall sun angle in a tiny sunny clearing. She was also spending 3 days, but had plenty of power for her older camper van.
As a retired engineer, planning and testing the capabilities of these systems is really enjoyable. And lesson learned! I am now getting a portable solar panel to plug into the port in the utility bay. Then we can boondock in many other beautiful locations here in Colorado and the other Rocky Mountain states.