(edge star 43qt, and some lights, maybe a heater rarely)
An electric heater (run from an inverter)? Or are you referring to the fan in a propane furnace?
If the former, you'll likely need a generator to run that (electricity is probably the least-efficient means to generate heat).
W/O the heater, you probably could get away with just a single 160W panel (or two 80W ones).
I have an Edgestar 43qt, 10-20 watts of LED lighting items, playing the stereo, and occasional charging of large R/C model batteries, and my 170W solar setup (2×85W) has had almost no issue keeping up with it.
Morningstar makes some of the best controllers IMO. I use the SunSaver MPPT-15 for my 170W setup.
Know that a MPPT controller is essentially required to make decent use of 24V-rated panels on a 12V system (they can step down the panel voltage where a PWM one cannot). A PWM controller is best used with panels rated for 12V use on a 12V system.
That's too small even for a single 160W panel on a 12V system.
For a MPPT controller, figure you need 1 amp for every 13 watts of solar. So for two 160W panels, you'd need a 25A controller.
For PWM controllers, the controller amperage rating needs to be the same or greater than the sum of the amperage rating of your panels.
Don't worry about LED displays etc, get something that is tough and waterproof.
