On the one hand--50 nights a year--no need for a generator even with a modest solar system, so long as there is a large battery bank.
On the other hand--full time--unless there is free shore power available, or a massive solar system with HUGE battery bank, a small generator for battery charging is worthwhile.
Mr Wizard is somewhere in between.
I know that in late October I use 20 kwh per day which would be hard to do with solar alone. But I also know that generator power works out to about $0.40 per kwh. So I need a 15 amp shore power connection.
I can manage pretty well for May and June, but July and August I need to run the air conditioner, consuming 30 kwh plus per day. September and early October works well.
I'm hoping that once I acquire one of those Mexican Autoformers that life will be much easier. I'll be able to use load support and dial down to 13 amps of input allowing for 2 amps for preventing voltage sagging.