It is normal to use only half of the capacity of a battery and this is called 50% depth of discharge (DOD) so the watts of a battery is volt X amp hours eg a 12 volt bat @ 200 AH would be 2400 watts but you can only use half of that other wise the battery will be stuffed, so all you have is 1200 watts, if you have a 400 AH battery you would have 2400 watts, you also have to know the capacity of the battery and this is call the C rating of the battery once you have that you can work out how many hours it will run for.
On an of grid system I would not use any less than 6oo to 700 AH @ C100
It is normal to size the batters to energy demand in KWHrs per day of (AC load )
Hope this help.
SOURCE: howtowire 2 12v batteries to an rv?
wire one hot lead to one battery and one neg lead to the same battery
then wire second battery to the first one
your inverter lead goes to the positive post of the first battery
993 views
Usually answered in minutes!
×