Victron Cyrix-Li-charge 12/24V-120A charging relay

The Cyrix Battery Coupler is a high performance microprocessor controlled relay that automatically connects batteries in parallel when one of them reaches a predetermined voltage level (indicating that the battery is charging) and disconnects the batteries again when the voltage falls below the float voltage level (indicating that one or both batteries are discharging). Cyrix Battery Couplers are an excellent replacement for 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.