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Think of how much battery you need and double it..Heating and cooling draws a lot of current..but you find out the numbers..say all up you find you draw 5 amps and you run for 5 hours your consumption is approx 25 amp which means you need a 100 amp hour battery so you do not discharge past 25%.
But that is a maxed out situation whereas in reality you may not need everything running full on...But My advice in the first sentence is worthwhilecthinking about...we all do the numbers and the result may be out of touch with reality...when it is cold the numbers go down hill...some folk claim they get by with old car batteries..well good for them but my experience gained from living in the bush on 12 vlts causes me to make the statement in the first sentence...batteries are best pampered which means if you can only discharge them 10 percent that is great...that's lead acid. ..100 to 120 amp battery is a minimum in my view.
If you are serious have a small genny (800 watt) and charger in the car boot ...no power all the fancy gear ain't worth zip..but make a list of what each item draws then get a battery four times that number as a reasonable safe approach.
Alex
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