If you were starting with a clean slate, and space/configuration
permitted, how about the use of 4 of the following large agm
batteries for a 48 volt system: lifeline 80, see this link.
A hi performance controller could be used such as the DCP 1200:
The use of only 4 batteries would greatly simplify individual
charging. Any thoughts?
Also, here is some sulfation info I found:
Sulphation of the lead plates occurs on all batteries over time.
There is one technology that keeps batteries from sulphating and one
that can remove sulphation once it occurs. Both types are produced by
PULSETECH. One is the PowerPulse unit which zaps the battery every
few seconds with a sulphate busting charge. This keeps good batteries
going much much longer (about $65). The second is the Solargizer.
This unit actually desulphates batteries by putting out a certain
frequency that makes the crystalline sulphate go back into solution.
It comes with a small solar panel to work in the sun ($60) but also
comes with a plug in adapter (about $99). I always buy the adapter
types since it is hard to always keep something in the sun. With the
110v adapter and the solar panel, you have both options. Abraham
Solar sells these. They do work and they are worth the money.