glennster If you read up, golf cart batteries have thicker plates, more room at the bottom and more surface area than a car battery. A car battery is designed to be used for only a short time. Golf cart batteries are made to supply current longer time. I've never seen a golf cart use 24 volts. The older ones use 36v and the newer used 48 volts. Not to say there weren't 24 volt models, just never seen one.
If I had free 12v batteries, I would put 2 in series and make 24 v. Then put 2 more in series, again 24v. Then put the 2 series strings in parallel. You could add as many 24 volt strings you wanted. Going to guess you would run out of space very soon. On the other hand, if you had to buy batteries, you would be better off getting 4 6v golf cart batteries.
I know of a golf course that sold all their electric carts and went to gas. In the long run they think it will save them money.
A true redneck would put a gas powered generator on a golf cart, use a couple of golf cart chargers to power the cart and not use batteries. Then drive the cart to Wal-mart so people would post a pic on "People of Wal-mart'." web sight:)