Victron Energy Cyrix-ct 12/24V-230A

The Cyrix battery coupler is a high performance microprocessor controlled relay that automatically connects batteries in parallel when one of them has reached a predetermined voltage level (indicating that the battery is charging) and disconnects the batteries again when the voltage drops below the float voltage level (indicating that one or both batteries are being discharged). Cyrix battery couplers are ideal for replacing isolating diodes. Their main feature is that there is virtually no voltage loss, so there is no need to increase the output voltage of the alternators or battery chargers.