Mark, what exactly is your "standard" fridge? If it is a 3-way running on LPG your electrical needs are minimal and a fairly low-spec solar system will be all that is required. If you are running a 12 volt compressor fridge, the amount of solar power you need will vary widely, depending on the actual model. Some take less than an Amp to run, while others can be 5 Amps or even more. Either way, a compressor fridge is usually a significant power user and any solar system needs to take this into account.