More info for the OP: For whatever it is worth, we have a 120 watt portable panel. It keeps us fully supplied with electricity for many days at a time. (This is for two people.)
But we are minimalists -- no TV, no music, careful use of electric devices. We run the furnace only at shower time in the evening -- the furnace is a big energy hog.
For us, the goal of camping is not to replicate the relative luxury of being at home. Instead, it is to listen to the silence, to be reasonably comfortable, and to be as far from other people as we can get.
But everyone has a different style of camping, so (as always) your mileage may vary!!