i don't recommend setting up three battery
banks. two is plenty. three will just increase your wiring
if you're buying
batteries i highly recommend 6 volt golf cart batteries. they are made for heavy duty use and deep discharging and charging
. to put them into your 12 volt system just take two 6v batteries and run a permanent heavy cable from one batteries positive post to the other batteries negative post. you now have 12 volt takeoff at the two remaining posts and you can treat the pair as a single
12 volt battery. we use a total of four golf cart batteries to give us 450 amp hours capacity. our last set lasted six years.
for a generator i own a honda 1000. the 2000 was only a hundred bucks more so price
was not a problem but the 1000 fits in my lazaratte and the 2000 doesn't. still, it runs my 35 amp charger and could probably run a 45 amp charger if i had one.
a neighbor of mine uses that stand alone 12 volt fridge and likes it. think he paid about $700 and says it uses very little power. he keeps it on a quarter berth but hopes to somehow fit it into the space where his old built in fridge used to be.
we're almost 100% 12 volt. the only big 120 item we can't live without is the mini shop vac we use for a vacuum cleaner. that runs off our 700 watt inverter
or the honda. even at a marina i don't bother plugging in to shore power
. we also use inverters to charge phones, tools, razor, laptop
and as capttman says, if you try too hard to get ready you will never leave.....