Victron Cyrix-Li-Intelligent Charge Relay 24/48V-120A
BMS-Controlled Charge Disconnect for LiFePO4 - 120A, IP54
Victron Cyrix-Li-Intelligent Load Relay 24/48V-...DESCRIPTION
Victron Cyrix-Li-Charge 24/48V-120A: Intelligent Charge Relay for LiFePO4 Battery Systems
Precision Charge Control for Lithium Battery Protection
The Victron Cyrix-Li-Charge 24/48V-120A is a specialised intelligent charge relay designed to integrate seamlessly with Victron VE.Bus BMS and LiFePO4 battery systems. It acts as a critical second line of defence, automatically connecting and disconnecting chargers to prevent cell overvoltage and over temperature conditions. This ensures your lithium battery bank operates within safe parameters, extending service life and maintaining system reliability.
Unlike generic relays, the Cyrix-Li-Charge responds directly to BMS signals, providing a coordinated protection strategy that reduces the risk of battery damage. Its low current consumption (under 4 mA when open) makes it suitable for energy-conscious installations, while the IP54 rating offers protection against dust and water spray, ideal for demanding mobile and off-grid environments.
How the Cyrix-Li-Charge Enhances System Safety
In a Victron LiFePO4 system, the VE.Bus BMS monitors individual cells. When it detects an imminent overvoltage or high temperature, it signals the Cyrix-Li-Charge to disconnect the charger immediately. This rapid response prevents stress on the cells, which can degrade capacity and lead to premature failure. The relay reconnects the charger after a 3-second delay once conditions normalise, with an adaptive re-engagement logic that extends the delay to 10 minutes after two rapid cycles, avoiding unnecessary switching.
Additionally, the relay disengages after 1 hour if battery voltage remains below 13.5 V (27 V or 54 V for 24/48 V systems), preventing unintended discharge. This intelligent behaviour distinguishes it from simple voltage-sensitive relays, offering tailored protection for lithium chemistry.
Key Features
- BMS-controlled charge disconnect for LiFePO4 batteries
- 120 A continuous rating at 12/24 V; 40 A breaking capacity at 48 V
- Low power draw: less than 4 mA when open
- IP54 protection against dust and water ingress
- Compact design: 46 x 46 x 80 mm for easy integration
- Clear on-device wiring diagram and status LED
- Built-in transient voltage suppression for safe disconnection
Reliable Integration with Victron Energy Ecosystem
The Cyrix-Li-Charge is engineered for straightforward installation within Victron systems. Its control input connects directly to the VE.Bus BMS charge disconnect terminal, ensuring plug-and-play compatibility. The heavy-duty M8 stud terminals (approx. 5/16"-18) accommodate secure cable connections, while the integrated mounting tabs allow firm attachment to flat surfaces. A multi-colour status LED provides immediate visual feedback on relay state, simplifying diagnostics.
For installers and system integrators, this relay eliminates the need for complex external logic, reducing wiring complexity and potential points of failure. It is particularly valuable in applications where chargers cannot be directly controlled by the BMS, such as alternators or non-Victron chargers.
Applications for Mobile and Off-Grid Power
This charge relay is suited to a range of scenarios where lithium battery protection is paramount:
- Marine electrical systems with LiFePO4 house banks
- RV and caravan solar setups using Victron components
- Off-grid cabins and remote power systems
- Commercial vehicle auxiliary power
- Industrial backup systems requiring precise charge control
By ensuring chargers only operate when safe, the Cyrix-Li-Charge helps maintain battery health in environments where temperature extremes and variable charging sources are common.
Protect Your Lithium Investment
Incorporate the Victron Cyrix-Li-Charge 24/48V-120A into your energy system to safeguard your LiFePO4 batteries against overcharge events. Its intelligent, BMS-driven operation provides peace of mind, whether you're at sea, on the road, or managing a remote installation. Add this essential protection to your setup today.
SKU: Vic-CYR020120430
SPECIFICATIONS
Specifications
| Product Code | CYR020120430 |
|---|---|
| Model | Cyrix-Li-Charge 24/48V-120A Intelligent Charge Relay |
| Continuous Current And Breaking Capacity At 12 V Or 24 V | 120 A |
| Breaking Capacity At 48 V | 40 A |
| Control Input | The Cyrix engages when the control input is high (approx. battery voltage). The Cyrix disengages when the control input is left free floating or pulled low. |
| Connect Voltage | 26.0 V or 52.0 V or more on its battery charger connection terminal |
| Battery Terminal Voltage | 2 V or more on its battery terminal |
| Charger Connection Delay | 3 seconds |
| Current Consumption When Open | < 4 mA |
| Protection Category | IP54 |
| Weight | 0.11 kg (0.24 lbs) |
| Dimensions H x W x D | 46 x 46 x 80 mm (1.8 x 1.8 x 3.2 inches) |
| SKU: | Vic-CYR020120430 |
| Barcode: | 8719076022268 |
| Model #: | CYR020120430 |
| MPN: | CYR020120430 |
WARRANTY
Victron Energy Limited Warranty Policy
Victron Energy warrants its products to be free from defects in workmanship and materials for a period of 5 years from the date of purchase by the end user, with a maximum of 66 months from the Victron Energy invoice date. Exceptions on this are: lead acid batteries; 2 years from date of purchase by the end user, with a maximum of 30 months from the Victron Energy invoice date, Lithium-ion batteries; 3 years from date of purchase by the end user. In addition to this proof of correct battery usage is required when making a battery warranty claim.
During this period, Victron Energy will, at its option, repair or replace the defective product free of charge. The warranty does not include performing or reimbursing de‐installation, transportation and re‐installation. This warranty will be considered void if the unit has suffered any physical damage or alteration, either internally or externally, and does not cover damages arising from improper use like: • Reverse of battery polarity. • Inadequate connection. • Mechanical shock or deformation. • Contact with liquid or oxidation by condensation. • Use in inappropriate environment (dust, corrosive vapor, humidity, high temperature, biological infestation...). • Breakage or damage due to lightning. • Connection terminals and screws destroyed or other damages, like overheat, due to insufficient tightening. • For any electronical breakage except due to lightning (reverse polarity, over‐voltage due to external cause), the state ofthe internal control diode and of the inputs/output X and Y capacitors determine the warranty.
This warranty will not apply where the product has been misused, neglected, improperly installed, or repaired by anyone else than Victron Energy or one of its authorized Qualified Service Partners. In order to qualify for the warranty, the product must not be disassembled or modified.
Repair or replacement are our sole remedies and Victron Energy shall not be liable for damages, whether direct, incidental,special, or consequential, even caused by negligence or fault.
Victron Energy owns all parts removed from repaired products. Victron Energy uses new or reconditioned parts made by various manufacturers in performing warranty repairs and building replacement products. If Victron Energy repairs or replaces a part of a product, its warranty term is not extended. In case of replacement the new component has a warranty of 6 months, without effect on the initial warranty period. All remedies and the measure for damages are limited to the above. Victron Energy shall in no event be liable for consequential, incidental, contingent orspecial damages, even if having been advised of the probability of such damages. Any and all other warranties expressed or implied arising by law, course of dealing, course of performance, usage of trade or otherwise, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited in duration to a period of two (2) years from the date of purchase.
Life Support Policy As a general policy, Victron Energy, does not recommend the use of any of its products in life support applications where failure or malfunction of the Victron Energy's product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Victron Energy does not recommend the use of any of its products in direct patient care. Victron Energy will not knowingly sell its products for use in such applications unless it receives in writing assurances satisfactory to Victron Energy that the risks of injury or damage have been minimized, the customer assumes all such risks, and the Liability of Victron Energy is adequately protected under the circumstances.
As a product requires service, it must be brought back to the place of purchase. In case no contact can be taken with the merchant, or if he is either unable or not allowed to provide service, direct contact should be taken with Victron Energy.
Warranty on Repairs The warranty period on products or on printed circuits boards repaired by Victron Energy as well as on printed circuit boards for replacement is 6 months from delivery by Victron Energy.
Transport It is the responsibility of the sender to sufficiently package these products. The transport must be organized in a way to avoid any damage, especially when a single unit or heavy unit is sent.
Severability If a part of the terms and conditions set out above is held invalid, void or unenforceable due to any particular national or international legislation, it shall not affect other parts of the terms and conditions remaining.
For Australia only Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
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