Victron Cyrix-Li-Charge 24/48V-230A Intelligent Charge RelayThe LiFePO4 battery: preventing cell under voltage, overvoltage and over temperature
The first line of protection is cell balancing. All Victron LiFePO4 batteries have integrated cell balancing. The second line of protection consists of:
- shut down of the load in case of imminent cell under voltage, and
- shut down or reduction of the charging current in case of imminent cell over voltage, high temperature (>50°C) or low temperature (<0°C).
The VE.Bus BMS is the core of the second protection line.
However, not all loads or chargers can be controlled directly by the VE.Bus BMS.
In order to shut down such loads or chargers several VE.Bus BMS controllable Cyrix switches are available.
Cyrix-Li-Charge
The Cyrix-Li-Charge will connect a battery charger with 3 seconds delay:
- if the charge disconnect output of the VE.Bus BMS is high, and
- if it senses 13,0 V (resp. 26,0 V or 52,0 V) or more on its battery charger connection terminal, and
- if it senses 2 V or more on its battery terminal
(the Cyrix will remain open if not connect to the battery).
The Cyrix-Li-Charge will disengage immediately whenever its control input becomes free floating, signalling cell over voltage or cell over temperature. In general, a cell over voltage alarm will reset shortly after charging has been stopped. The Cyrix will then reconnect the charger after a delay 3 seconds. When the Cyrix-Li-Charge is engaged (charger connected to battery) it will disengage after 1 hour to check if the charger is still enabled.If, after the Cyrix has disengaged, the output of the battery charger immediately increases to 13,0 V or more, the Cyrix will reengage, with a 3 seconds delay.
Note: In case of zero discharge current, or a small discharge current, the Cyrix will not disengage shortly after the charger has been switched off and/or disconnected, because battery voltage will remain higher than 13,5 V.
Continuous current and breaking capacity at 12 V or 24 V - 230A
LED status indication - Yes
Control cable - Included (length 1 meter)
Control input - The Cyrix engages when the control input is high (appr. Battery voltage)
The Cyrix disengages when the control input is left free floating or pulled low
Connect voltage - 26V / 52V
Disconnect voltage - 11.5V < V < 11.0V: 10s / V < 10.5V: immediate
Current consumption when open - <4 mA
Protection category - IP54
Weight kg (lbs) - 0,27 (0.6)
Dimensions h x w x d in mm (h x w x d in inches) - 65 x 100 x 50 (2.6 x 4.0 x 2.0) | 
