Most 12VDC Batteries currently available from local sources only are rated 100-120AHs.. Using two of those in parallel will give you 200-240AHs...
The GOLF CART 6V battery use larger plates inside and can produce 200-220AHs. You have to use two of these batteries in series to get 12VDC however... Connected in series however does not double the AHs...
The 6VDC batteries from COSTCO are around $90 each.
Hard to find a couple of 12VDC 220AH batteries for less than $180. That is usually the price for one 12VDC battery.
Roy Ken
