I agree with Cuppa and GQtdauto, too many variables to give a one sentence answer. I run 2 off 60w Canon Shade tolerant panels into a 200a/h deep cycle, with current monitoring. The max rated output is 3.88a/panel. I get anywhere from 0.1 to 4.1amps per panel depending on the time of day, the ambient temperature, cloud cover. I try to keep the depth of discharge as minimal as possible to prolong battery life, so when I get to say 12.5V, I start the car and give the battery a booster shot from the alternator. I run my fridge at 1 degC plus minus 0.2degC using a calibrated external controller. I have an old 60L Engel fidge with the old compressor that draws 6amps - the newer compressor draws 4 amps using a smart controller. I also run a thermostatically controlled circulation fan that draws 0.1a and comes on at 35degC and off at 28 degC - this circulates the cabin air to improve the heat transfer process of the fridge. I love these panels as they are glass free and laid on SS sheet - basically indestructable, but Canon have stopped making them now. If going for a panel, look at a shade tolerant panel, probably monocrystalline for the highest efficiency. Mine are fix mounted on the roof rack with a 10" airgap to the roof, so they don't suffer too much from reflected heat, the portable panels are a good option as it allows you to optimse the charge with repositioning/aligment during the day, but for me thats too much effort. Hope this helps. Also, your fridge consumption will increase with ambient temperature, so bear this in mind when doing your calculations, plus you only get abot 5 hrs a day at max radiation, and this is approx 60% of the value the panels are rated at, another allowance required.