Dual battery system control circuit

摘要

Dual batteries having a CRAnking battery and an AUXiliary battery require a switch to the alternator and to disconnect the auxiliaries before the battery becomes depleted. The switch measures the AUXiliary battery's state of charge during alternator charging. The switch opens to prevent overcharging and to preserve the CRAnking battery charge while allowing the AUXiliary battery to discharge preferentially. The switch instructs the alternator to select a burst, float or top up charging voltage depending on the AUXiliary battery state of charge. The switch uses microprocessor control. This utilizes tables to interpret circuit values. A 3-axis graph relates discharge current and voltage with state of charge.