You might want to start by looking at this:
Several members here use Aquion batteries.
EDIT: AND, you might try the MidNite Forum:http://www.midniteforum.com/
Try entering " aquion " in the search box, there, and you should find several Threads. It appears that the Aquion batteries still have relatively poor Surge performance, which can cause some disappointment for off-grid users, seems to me ...