Victron Cyrix-Li-ct intelligent Li-ion Battery Combiner 12/24V-230A
Victron Cyrix-Li-ct intelligent Li-ion Battery Combiner 12/24V-230A
Intelligent Lead-Acid to LiFePO4 Paralleling with VE.Bus BMS Control

DESCRIPTION
Advanced 12/24V 230A Lithium Battery Combiner
Intelligent Dual Battery Management for LiFePO4 Systems
The Victron Cyrix-Li-ct is a highly sophisticated, microprocessor-controlled heavy-duty relay designed explicitly for dual battery setups that combine a traditional lead-acid starter battery with a LiFePO4 (Lithium Iron Phosphate) auxiliary battery. Managing the connection between two fundamentally different battery chemistries requires precision. This intelligent relay ensures your batteries are safely paralleled for charging while protecting your sensitive lithium cells from improper voltage levels and extreme temperature conditions. Operating seamlessly at both 12V and 24V with a robust 230A continuous current rating, it is engineered for demanding marine, RV, and off-grid automotive applications.
Seamless VE.Bus BMS Integration
Lithium batteries require strict operational parameters to prevent permanent cell damage. The Cyrix-Li-ct is designed to work in perfect harmony with the Victron VE.Bus BMS (Battery Management System). It actively monitors the Charge Disconnect output of the BMS. If the BMS detects an imminent cell overvoltage or high internal temperature, the control output becomes free-floating, and the relay immediately disengages to protect the battery bank. It will parallel connect your lead-acid and lithium batteries only when the BMS authorises charging and the relay senses at least 13.4V (or 26.8V for 24V systems) on one of its power terminals.
Built-In Transient Voltage Suppression
Sudden disconnections under heavy charge loads can create dangerous voltage spikes, which pose a significant risk to connected sensitive electronics. To mitigate this, the Cyrix-Li-ct features a built-in transient voltage suppressor. This critical safety component absorbs and limits any hazardous voltage spikes that may occur when the relay suddenly opens due to a BMS alarm, ensuring the continued safety of your vehicle or vessel's electrical network.
Start Assist Functionality
In emergency situations where your lead-acid starter battery is depleted, the Cyrix-Li-ct includes a highly practical start assist feature. By applying a short positive pulse to the dedicated control terminal, the relay forces the contacts closed for 30 seconds. This temporarily bridges the lithium house battery to the starter battery, providing the necessary cranking current to start your engine, ensuring you are never left stranded in remote locations.
Key Features
- Intelligent parallel connection of lead-acid starter and LiFePO4 house batteries
- Robust 230A continuous current rating for demanding high-draw systems
- Direct integration with Victron VE.Bus BMS for superior cell protection
- Integrated transient voltage suppressor to prevent damaging electrical spikes
- Emergency start assist function bridges batteries for 30 seconds
- Automatic 12V and 24V system voltage detection
- Disengages immediately upon BMS alarm or when battery voltage drops below 13.2V
Clear LED Status Indication
Monitoring the real-time operational status of your dual battery system is made straightforward via the integrated blue LED indicator on the top of the unit. The LED provides immediate visual feedback:
- Solid LED: Relay is engaged and batteries are paralleled
- 10-second flash: Relay is disengaged
- 2-second flash: Connection is pending
- 2-second blink: Disconnection is pending
- 0.25-second rapid blink: Alarm state (triggered by over-temperature, high voltage exceeding 16V, both batteries below 10V, or one battery below 2V)
Optimise Your Off-Grid Power Architecture
Relying on generic isolation switches for mixed-chemistry battery banks can lead to suboptimal charging and potential cell damage. Integrating this sophisticated relay into your electrical system ensures that your investment in premium lithium storage remains fully protected. Upgrade your mobile power system with the Victron Cyrix-Li-ct 12/24V 230A today and ensure safe, efficient, and intelligent battery management for your next journey.
SKU: Vic-CYR010230412
SPECIFICATIONS
Specifications
| Model | Cyrix-Li-ct 12/24-230 |
|---|---|
| Application | Will Parallel Connect A Lead Acid Starter Battery And A LiFePO4 Battery |
| Continuous Current And Breaking Capacity At 12 V Or 24 V | 230 A |
| Breaking Capacity At 48 V | N.A. |
| Control Cable | Included (Length 1 m) |
| 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 (12 V System) | 13.4 V < V < 13.7 V: 120 s; 13.7 V < V < 13.9 V: 30 s; V > 13.9 V: 4 s |
| Connect Voltage (24 V System) | 26.8 V < V < 27.4 V: 120 s; 27.4 V < V < 27.8 V: 30 s; V > 27.8 V: 4 s |
| Disconnect Voltage (12 V System) | V < 13.2 V: Immediate |
| Disconnect Voltage (24 V System) | V < 26.4 V: Immediate |
| Start Assist Function | A Short Negative Pulse Will Close The Relay During 30 Seconds |
| Transient Voltage Suppressor | Built-In |
| LED Status Indication | Yes; LED On: Engaged; LED 10 s Flash: Disengaged; LED 2 s Flash: Connecting; LED 2 s Blink: Disconnecting; LED 0.25 s Blink: Alarm (Over Temperature; Voltage > 16 V; Both Batteries < 10 V; One Battery < 2 V) (Multiply by Two for 24 V) |
| Current Consumption When Open | < 4 mA |
| Protection Category | IP54 |
| Weight | 0.27 kg (0.6 lbs) |
| Dimensions | 65 x 100 x 50 mm (2.6 x 4.0 x 2.0 inches) |
| SKU: | Vic-CYR010230412 |
| Barcode: | 8719076034346 |
| Model #: | CYR010230412 |
| MPN: | CYR010230412 |
WARRANTY
Victron Energy Limited Warranty Policy
Direct Customers
Victron Energy provides the following warranty to any direct customer (OEM, distributor or dealer) in relation to any products that Victron Energy has directly sold to the direct customer. This warranty is not an end-user warranty between Victron Energy and an end-user, and end-users shall not have any rights or remedies under this limited warranty towards Victron Energy directly. The direct customer shall, in turn, ensure that the end-user is provided with a warranty identical to this warranty, subject to applicable local mandatory law.
End-Users
Victron Energy may also provide a warranty directly to end-users, in which case the below warranty conditions equally apply to such warranty. In that case, end-users shall claim their warranty at their place of purchase or through the original direct customer of Victron, which can be found through the support section on Victron’s website https://www.victronenergy.com/support. Hence, the direct customer shall on behalf of Victron Energy deal with any warranty claims made under any warranty that Victron Energy may provide directly to end-users. This support section on Victron’s website https://www.victronenergy.com/support will provide further guidance on the procedure for end-users to make a claim under this limited warranty.
If the end-user is a consumer – a natural person who is acting for purposes which are outside that person's trade, business, craft or profession – the following applies. The rights and remedies granted to the consumer under this limited warranty are without prejudice to the consumer’s statutory rights. Furthermore, the consumer is entitled by law to remedies from the seller free of charge in the event of a lack of conformity of the goods (such as repair, replacement, price reduction or rescission), which remedies are not affected by this limited warranty.
Warranty
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 original 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 original end-user, with a maximum of 30 months from the Victron Energy invoice date, Lithium batteries: 3 years from date of purchase by the original end-user, with a maximum of 42 months from the Victron Energy invoice date. In addition to this, proof of correct battery usage is required when making a battery warranty claim.
For a 10% surcharge on the current net price for products that came with a 5-year warranty, an additional 5 years of warranty can be purchased by Victron’s direct customers, bringing the total warranty to 10 years. Warranty extensions need to be applied for ultimately one year before the expiration of the original term. Victron may ask proof that the product was still functional at the time of purchase of the extended warranty.
During the warranty period, Victron Energy will, at its discretion, repair, replace or (partly) credit 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:
- Reversed battery polarity.
- Inadequate connection.
- Mechanical shock or deformation.
- Contact with liquid or oxidation by condensation.
- Use in an inappropriate environment (dust, corrosive vapour, humidity, high temperature, biological infestation, etc.).
- Breakage or damage due to lightning.
- Connection terminals and screws destroyed or other damages, like overheating, due to insufficient tightening.
- For any electronic breakage except due to lightning (reverse polarity, over‐voltage due to external cause), the state of the internal control diode and/or the input/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 other than Victron Energy or one of its authorized Repair Centres. In order to qualify for the warranty, the product must not be disassembled or modified.
This warranty and our warranty obligations thereunder (repair, replacement or credit) are the direct customer’s and, if applicable, the end-user’s sole rights and remedies and our sole obligations with respect to any defective and/or non-conforming product or breach of warranty and is subject to and without prejudice to the limitations of liability in this warranty.
Victron Energy shall not be liable for damages, whether direct, incidental, special, or consequential, even caused by negligence or fault.
As a product requires service, it must be brought back to the place of purchase. In case no contact can be made with the merchant, or if he is either unable or not allowed to provide service, direct contact should be made with Victron Energy through the support section on Victron’s website.
In case Victron Energy replaces a product, it will own the replaced product. Victron Energy owns all parts removed from repaired products. Victron Energy uses new or reconditioned parts made by various manufacturers when performing warranty repairs or building replacement products.
If Victron Energy repairs or replaces a part of a product, its warranty term is not extended: the warranty will apply for the remaining term of the original warranty term. For example, if Victron Energy replaces a product with a 5-year warranty after 3 years, the warranty of this product will apply for another 2 years, with a minimum of 6 months.
All remedies and the measure for damages are limited to the above. Victron Energy shall in no event be liable for consequential, incidental, contingent or special damages, even if having been advised of the probability of such damages.
The foregoing limited warranty provided by Victron Energy is in lieu of any other warranties, express or implied arising by law, course of dealing, course of performance, usage of trade or otherwise, of any kind whatsoever including, without limitation, warranties of merchantability or fitness for a particular purpose, with respect to any product. The above is without prejudice to the arrangement for consumers detailed above.
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 Victron Energy's product can be reasonably expected to cause the 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.
Warranty on repairs for products outside their warranty period
The warranty period on products that are outside their warranty period and have been repaired by Victron Energy or one of the Victron Energy Repair centres is six (6) months from delivery. The same applies to spare parts and circuit boards that have been supplied or repaired 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 of this warranty 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 of this warranty.
Applicable law
This warranty is exclusively governed by the laws of the Netherlands, to the exclusion of the UN Convention on Contracts for the International Sale of Goods.
Contact details
Victron Energy B.V. | De Paal 35, 1351 JG Almere, The Netherlands | https://www.victronenergy.com/support














































