We have a single 100w panel with a cheap Morningstar controller (PWM) on our remote camper (34ft bunkhouse semi permanent) and it's enough for furnace, detectors, fridge controller (using propane, of course), and old lights that haven't yet been upgraded yet. But it's bright Western sky, and we have two 6v gold cart batteries. Whatever we use on a cold night with the furnace is made up mid day. We used to run 400w inverters from the 12v plugs for tv, which worked if the tv was not too big. Now, I have a separate workshop solar power center to send only 120v to the trailer for TV and charging things. We disconnected the DC converter since the 100w panel still does the job!
But, get the thickest wires run from the drop down point on the roof, and from your controller, so you can easily add more. You're going to love being able to use a toaster or hair dryer without cranking a generator, just need some good batteries, cable, and inverter. Any wattage panel will eventually catch up with your use, but you'll have to wait for the 100w a lot once you go with a decent sized inverter. Cause now you can run power tools, compressors, vacuums.......
We love having solar, even if it's to just power the fantastic fan while it's parked at a big shopping area.