The iboats forum moderators are excited to announce that at this time it appears the iboats forums posting pictures function is working once again. Though we cannot promise for how long, we're hoping for indefinitely.
It depends on how those batteries are wired. Are they wired in series for 24v? Or are they indepandant systems. No doubt one of these will work for you. Probably 85-2611, since it will charge two 12v circuits or 24v.