AuroraGirl
I'm Awesome
they arent very loved for when they break but you may want to consider gettig overrunning /decoupler pullies on them too. the forces on the single belt will be harsh and probably tax the single belt tensioner as it is. if they include a second tensioner somehow that will help a lotInitially i was planning on running this dual battery setup in parallel as mentioned previously. After giving this more thought i believe it would be better planned as an alternate setup. This will ensure a teenager doesn't run both batteries dry due to a lack of paying attention and the obvious inability to crank up afterwards. It will also give the opportunity to divorce the alternators and plum in remote rectifiers as you mention, thereby also increasing output voltage. Given i can add underdrive pulleys, that will also increase idle amperage output as well.
When it came to batteries, I was thinking about a automotive audio battery which tend to be.. i dont remember to be honest, but its not usually the size of your normal one, and I believe they are deep cell. i dont know how they wire in, but usually they live near the equipment.