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Cyrix-Li-charge 24/48V-120A intelligent charge relay

Original price was: $128.66.Current price is: $116.96. (inc. GST)

The Cyrix-Li-charge 24/48V-120A intelligent charge relay is similar to the Cyrix-Li-charge 12/24V-120A, but it is designed to be used with 24V and 48V electrical systems.

Like its counterpart, this intelligent charge relay is capable of handling charge currents up to 120 amps and features automatic connection and disconnection of the battery from the charger depending on the battery voltage level. This feature helps to ensure that the battery is charged to the appropriate level and prevents overcharging.

SKU: CYR020120430 Categories: ,

Victron 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 13,7V (resp. 27,4V or 54,8V) or more on its battery charger connection terminal, and

-if it senses 2V 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 of 3 seconds. After two attempts to reengage with 3 seconds delay, the delay increases to 10 minutes. Whenever battery voltage is less than 13,5V (resp. 27V or 54V), the Cyrix will disengage with a delay of 1 hour.

Note 1: 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 13,5V.

Note 2: If, after the Cyrix has disengaged, the output of the battery charger immediately increases to 13,7V or more, the Cyrix will re-engage, with 3 seconds delay.



The functionality of the Cyrix-Li-ct is analogous to the Cyrix-ct. The Cyrix-Li-ct will parallel connect a lead acid starter battery and a LiFePO4 battery:

-if the Charge Disconnect output of the VE.Bus BMS is high, and

-if it senses 13,4V (resp. 26,8V) or more on one of its power terminals.

The Cyrix will disengage immediately:

-when its control output becomes free floating, signalling cell over voltage or cell over temperature, and/or

-when battery voltage drops below 13,2V.

Start assist function: a short positive pulse will close the relay during 30 seconds. A built-in transient voltage suppressor will limit the voltage spike that may occur when the Cyrix suddenly

Additional information

Cyrix Battery Combiner

Cyrix-Li-Charge 24/48-120

Continuous current and breaking capacity at 12V or 24V


Breaking capacity at 48V


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

13,7V / 27,4V / 54,8V

Disconnect voltage

See text

Current consumption when open

<4 mA

Protection category


Weight kg (lbs)

0,11 (0.24)

Dimensions HxWxD in mm (HxWxD in inches)

46 x 46 x 80


Datasheet-Cyrix-Li-ion-120-A-ENVictron Cyrix Li-charge 24/48V-120A relay spec sheet-