Rockford Fosgate CPSRMultiple battery system regulator

CPSR isolates auxiliary batteries without voltage loss. The CPSR ensures proper voltage level in the primary (starting) battery by allowing charge to that battery until it reaches 12.5 volts. Once this voltage level has been established, the CPSR couples all batteries so they can be charged collectively. When the ignition is turned off, the CPSR becomes a one-way gate isolating current from the primary (starting) battery from passing through to the auxiliary batteries.