Maybe not. I think the question is how much current do you have to push through each pack to stop the sulfasion. I like many others have used a single 12v battery charger to charge multiple 12v batteries. In my case I was using twin 24v 18ah SLA packs. So when I got home I needed to charge 4 12v 18ah batteries but at the time I had only 1 12v Black & Decker charger. So I made a simple plug setup that allowed me to charge up to 6 12v batteries with the 1 charger. Of course the current was devided by the total of batteries being charged. So if I set the charger at at 6a each battery was actually charging at 1a.

The problem is solar charger get real expensive as the size increases. I saw on a scooter forum a guy who mounted a solar charger to the back of his scooter to charger his battery as he rode because his power draw was higher then his charge current. IT solved his problem and the solar cell wasn't very large.