Veewee: Wrong.
If you have a string of four 12V batteries in a row, each rated at 100 AH, then your 48V system has 100 AH capacity.
If you take the same batteries, hook them all up in parallel to each other, then you have a 12V battery bank, with 400 AH capacity.
Please read the question more carefully before answering.
Steven Fahey
[ Parent ]