The Dual Pro 3 Bank TRI PRO marine battery charger is a 3 bank, 15 amp 12 volt per bank, temperature compensation charger. The Pro series are
heavy duty, microprocessor controlled, waterproof, and fully potted vibration proof battery chargers.
These independent output battery chargers have a separate positive and negative terminal for each battery bank, and a separate microprocessor for each which controls the charging profile. With this design, they can be used on batteries which differ in state of charge, age, size, or type
(sealed, flooded).
This works well in applications with a starting battery and a trolling setup.
It also is suitable for series strings of 12 volt batteries for 24 or 36 volts.
Once each battery has its individual positive and negative terminals connected, the microprocessor for each output does not care if the batteries are in series or parallel.
This is useful in 24 - 36 volt applications where one of the 12 volt batteries
in the string supplies some 12 volt loads and the other batteries do not.
The batteries in this situation end up with an imbalance condition.