Get used to the fact that without a land line your electrical use will change dramatically - for the worse, or festoon your boat with solar so it looks like a space station,
run an anti social gen set/main engine for hours on end and budget for new batteries every couple of years or so
Others will say no probs dont use hair dryers, swith off the fridge in winter, watch a mini tv and if you have a washing machine a big inverter and run the engine when you use it
However we manage in our campervan for 3 to 4 months in the Isle of Man with 235 a/h, 80 watt solar and a 1200 watt inverter, but this is spring/summer
We are now in our 8th year living afloat CCing,none service mooring, full service marina and latterly f/s not enclosed river frontage marina
Captain will not now give up her unlimited use of electric
Life is for living the way you wish
Good Luck
Ray