The bottom line is if you do not have shore power, amp/hrs drawn from the batteries have to be replaced or the batteries are toast. Everyone has different camping life styles requiring different energy needs.
Solar has made huge gains in the RV sector in the last 10 years but it still is not the magic pill. It will replace amp/hrs, if not in long term shady or cloudy situations, if the system is adequate.
Energy conservation and changing existing systems to energy efficient such as LED lighting etc. can help make for self sufficient off grid camping.
Our 10 day trip to Powell River in July/12 was extremely wet but we did not use the the genny at all and no shore power.
Solar and alternator were the power sources. It was a peacefull trip.
Rained buckets and was cloudy every day. Our fridge cycled very little as the temps were 62F-45F. July long week end and we were alone.
Another wet portage on the Powell Lakes canoe circuit.
Dave