I just bought 4 Renogy 100w panels on Amazon for less than a dollar a watt. There for my golf cart though lol.
As for whether or not you can run A/C or space heaters off solar, yes you can but it's expensive. Like around $10k expensive and you need lots of roof for the panels. Once you have it though it's pretty amazing. Dry camped for 4 nights running the furnace all night, set my Kuerig to heat up at 5:00 am and stays on for 2 hours. Even if there's no sun, with lithium batteries I can charge them fully in an hour or two max with the generator and a 120a charger.