For 3 Battery Banks. ProSplit is an advanced split charge management device, developed specifically to deal with the complex nature of modern multi battery systems in boats and vehicles. For single or dual alternator input to two, three or four battery bank installations. Complex software analyses every perceivable condition to ensure charging priorities are managed exactly as you want with specific focus on preserving charge in the the engine start battery. Each input & output terminal is independently monitored to establish status before deciding where charge will be delivered and to prevent discharge from one battery to another.