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If they are AGM batteries, you want to use AGM mode. AGM and plain lead acid batteries charge/absorb current at different rates for a given voltage. A smart charger uses the voltage vis current to determine the charge rate and state of charge and control things for best efficiency and best...

Before I pulled my instrunment shunt the other day, I connected a millivoltmeter to it, pressed the start inhibit and did a couple of longer crank cycles on it. It averaged around 15 MV while cranking but the meter did record a peak transient of 26MV. If the spec I found for the shunt is...

Considering the battery bank is grossly oversized for the engine/starter, no I would not find a good crank and start at 25% that surprising... Cat specs a pair of group 31’s in series(100AH) for their equipment that uses these engines. The 4 batt milspec bank is 240AH...

Well actually I did... Like NDT said, if it is charging one battery in parallel, it IS charging the other battery as well. The interconnect wiring between the batteries gives it no choice... If one battery is at 14 and the other three are actually at 12, then you have a battery interconnect...

It may be isolated internally, but with the batteries tied together externally, and with good connections, a 4 channel noco basically becomes a 2 channel noco, as the two channels attached to parallel batteries are basically working in parallel. Yes, there are some slight differences in voltages...

Yea, I forgot about those. That is a great way also, but they are kinda spendy aren’t they?

Yea simp, I don’t understand... NDT is on track... The pair of batteries farthest from the frame are the 0-12V set. The pair closest to the frame are the 12-24 set. think of a charger/maintainer like another battery. you connect a 12v maintainer -to- and +to+ on an outer battery. You...