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VICTRON ENERGY CYR010120412, is a battery combiner (isolation relay) for lithium batteries. The Cyrix battery combiner is a microprocessor-controlled powerful relay that automatically connects batteries in parallel when one of them has reached a preset voltage (indicating that the battery is charging) and disconnects when the voltage drops to a floating level (indicating that one or more batteries are discharging). The Cyrix battery combiner is an excellent alternative to diode isolators. The most important feature is that there is practically no voltage drop so that the output voltage from generators or battery chargers does not need to be increased.
The Cyrix connects a starter battery (lead-acid) with a lithium battery if: The charge output from a VE-Bus BMS is high or if there is more than 13.4V (26.8V respectively) on the terminal. The Cyrix disconnects immediately: When the control output is free, indicating overvoltage or overtemperature or when the battery voltage is below 13.2V. The Cyrix has a start assist function. A short pulse closes the relay for 30 seconds.
Overheat protection
The Cyrix disconnects if temperatures become too high, and reconnects when it has cooled down.
No voltage loss
The Cyrix battery combiner is an excellent replacement for isolation diodes. The great advantage is that there is no voltage loss, so the voltage from the alternator or battery charger does not need to be increased.
Starter battery prioritization
In a typical installation, the alternator is connected directly to the starter battery. The house battery and possibly a bow thruster battery or other battery, are each connected to the starter battery with a Cyrix battery combiner. When a Cyrix senses that the starter battery has reached the coupling voltage, it ensures that the others are charged in parallel.
Bidirectional voltage sensing
The Cyrix senses the voltage from both batteries. It can therefore also connect if, for example, the house battery is charged with a charger. The Cyrix-ct 12/34 has dual power supply. Therefore, it switches on if the voltage from a battery is too low to control the unit. To protect against accidental use, the Cyrix-ct does not close if the voltage is lower than 2V (12V batteries) or 4V (24V batteries).
Parallel connection in an emergency (Start Assist)
The Cyrix can also be switched on with a push button (Cyrix is closed for 30 seconds) or a switch for manual operation. This is suitable if a battery is discharged or damaged.
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