A "real fridge" would be 110v and need an inverter which would likely suck much more juice.
Start looking at Edgestars if you're trying to maintain a budget.
Tried out the new Renogy 100w kit over the weekend. 5000 feet elevation, very sunny (with fridge in direct sun), ARB 50L set at 31 degrees F, lots of open time on the fridge, two 122 AH JCI marine batteries from Walmart (flooded but maintenance-free).
I set the controller and watched the voltage climb. Very happy when it settled in at 14.47 volts and never budged.
Overnight I lost 1/10 volt as expected but otherwise this kit did precisely what its supposed to do.
Open bag
Hook to battery, deploy legs, set controller
Turn it every so often to face the sun
The only drawback is that you need to visit it every so often to move it for maximum sun exposure.
Otherwise I'd say it's perfect.