At 07:19 PM 7/28/2007, Michael Elliott wrote...
>Near as I can tell, an oversized alternator isn't going to provide
>quick
>charging batteries. Lead acid batteries can't be quick charged without
>damaging them. A charge rate of 20% to 25% of the total ampere-hour
>rating of a flooded (not sealed) battery is recommended while sealed
>batteries (gel, AGM) want a slower rate.

So, for a 200A alternator, you just need two of these (for 12V, 820AH):
http://www.azsolar.com/catalog/item/1496902/952162.htm

Only 636 pounds.

But I think you're being aggressive with the charge rates, I think
10-15% is more common, so double that.