If I was going through the trouble to install a solar system (even a minimal one) I would buy the largest cost effective panel available. Something like a 240 watt panel. You have to mount the panel somewhere, then the controller, and then run all the wiring. Why put a bare bones panel/system in when for a little more you can install something you can use with a little excess capacity? With two 240 watt panels and two batteries you could even run the frig on 120 volt inverted solar power (if it's gas/elec and you store outside) eliminating the need for propane during storage altogether. Just a thought.
To answer your initial question, it would not be unreasonable to see 15 A-hr of nuisance load per day.
Chum lee