Hi jay see
Phone charging takes 3/5ths of bugger all. Lights vary considerably depending on type. Of course lots of phones add up to more.
50l fridge will most likely draw 3.5 to 4 amps, & if being run as a fridge & not opened too often, will run around a 50% duty cycle. 42Ah to 48Ah each 24 hours. Unless you are running a bunch of Halogen lights 50 to 60 Ah's should cover your needs over the 4 days.
A 200w panel in perfect solar conditions at this time of the year will feed around 50 to 60Ah a dainto your battery, possibly a bit more, so you should be ok, even if the weather is not perfect you should have sufficient capacity to get you through the 4 days until you can recharge the battery at home.
For longer periods I would advise greater solar capacity & looking to the future it would be a wise move to buy a regulator with sufficient capacity to cover that now, rather than having to buy another reg in the future. If you buy a good quality reg they are generally capable of operating at full capacity & often a little over (cheap ones are the opposite). I would think that 300w of panels would cover you indefinitely year round for what you have said you want to run. 300w would manage with a quality 20 amp reg.
I suggest that a 200w panel is a pretty cumbersome & heavy thing to lug in & out of the car. My preference would be to use 100w panels.
My apologies for a delay in replying too. Haven't had any phone connectivity for a few days.
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