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Victron Cyrix-ct Intelligent Battery Combiner 12/24V-230A VSR
Victron Cyrix-ct Intelligent Battery Combiner 12/24V-230A VSR
230A Continuous, Intelligent Trend Detection, Start Assist, IP54
Highlights:Status LED: Blue LED indicator showing the current operating state of the combiner,Control Connection: Port for control cable and negative battery connection,Battery Terminal: Heavy-duty bolt for positive battery bank cable connections,Mounting Wing: Integrated mounting flange with pre-drilled holes for secure installation,Product Labels: Clear identification of voltage range, current rating, and protection features.
The Victron Cyrix-ct features a bright blue LED status indicator for clear visual confirmation of the battery combiner's operating state, including over-current and over-temperature protection.
One metre long black control cable specifically designed for the Cyrix-ct 12/24-230 battery combiner, featuring a pre-terminated connector and stripped ends.
Key features: Dual battery bank connection (Start and Domestic), Integration with Alternator and Starter Motor, Start Assist button wiring path, Fuse protection on battery lines, Compatible connection to Victron MultiPlus inverter charger. 
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DESCRIPTION
Victron Cyrix-ct 12/24V-230A: Intelligent Battery Combiner for Dual-Battery Systems
Advanced Voltage Sensing Relay for Reliable Parallel Charging
The Victron Cyrix-ct 12/24V-230A is a microprocessor-controlled voltage sensitive relay (VSR) designed to intelligently manage dual-battery systems in vehicles, boats, and off-grid installations. Unlike conventional split charge relays that rely on simple voltage thresholds and fixed time delays, the Cyrix-ct uses intelligent trend detection to prevent unwanted switching caused by momentary voltage dips or spikes. This ensures your auxiliary battery bank charges reliably without premature disconnection, even when powering high-demand loads.
Engineered for 12V and 24V auto-ranging systems, this 230A continuous battery combiner is an ideal solution for caravan battery charging, marine dual-battery setups, 4x4 auxiliary power, and commercial vehicle electrical systems. Its bidirectional voltage sensing and dual power supply allow it to engage from either battery side, making it a versatile component in any DC charging architecture.
Intelligent Trend Detection: Smarter Than a Standard VSR
Traditional battery combiners often disconnect under short, high-amperage loads or fail to connect a deeply discharged battery bank because the voltage immediately drops below the disengage threshold. The Cyrix-ct overcomes these limitations by analysing the voltage trend over time. It only reverses a connection decision if the trend has genuinely reversed, with a time delay proportional to the voltage deviation. This prevents nuisance switching and ensures stable, continuous charging.
Key Features
- 230A continuous current rating with 500A cranking capacity for 5 seconds, supporting large battery banks and high inrush loads
- 12/24V auto-ranging automatically detects system voltage, simplifying installation across mixed fleets
- Bidirectional voltage sensing and dual power supply allow engagement from either battery, ideal for alternator or shore charger input
- Start Assist function enables manual parallel connection for 30 seconds via push button or switch, providing emergency cranking power from the auxiliary battery
- Over-temperature protection disengages the relay if contact temperature exceeds safe limits, automatically reconnecting after cooling
- LED status indicator provides clear visual feedback: engaged, disengaged, connecting, disconnecting, and alarm states
- Virtually zero voltage drop across the contacts, eliminating the need to increase alternator or charger output voltage as required with diode isolators
- Prioritises starter battery by only engaging when the starter battery reaches the connect voltage, ensuring reliable engine starting
- 16 mm (M8) long bolts allow secure connection of multiple heavy-duty cable lugs
- IP54 protection rated for dust and water spray, suitable for engine bays and exposed installations
- Low current consumption: less than 4 mA when open, 320 mA (12V) or 180 mA (24V) when closed
Built for Demanding Environments
The Cyrix-ct operates reliably in temperatures from -40 to +60 °C, making it suitable for Australian outback conditions, marine engine rooms, and cold-climate expeditions. Its compact dimensions (65 x 100 x 50 mm) and lightweight design (0.27 kg) allow flexible mounting in tight spaces. The included 1-metre control cable simplifies integration with existing wiring, while the robust M8 stud terminals accommodate heavy-gauge cables for minimal resistance.
Applications
- Caravans and motorhomes: automatically charge house batteries from the alternator while driving
- 4x4 and off-road vehicles: maintain auxiliary power for winches, fridges, and lighting
- Marine vessels: combine starter and service battery banks for efficient charging underway or at dock
- Commercial trucks and buses: manage multiple battery banks for lift gates, communications, and auxiliary equipment
- Off-grid solar systems: integrate with battery chargers to parallel charge multiple battery strings
Why Choose the Cyrix-ct Over Diode Isolators?
Diode isolators introduce a voltage drop of 0.6-0.7V, requiring higher alternator output and reducing charging efficiency. The Cyrix-ct uses a mechanical relay with negligible voltage loss, ensuring your batteries receive the full charging voltage. This leads to faster, more complete charging and longer battery life, especially critical for AGM and lithium batteries that require precise voltage regulation.
Upgrade Your Dual-Battery System Today
Experience reliable, intelligent battery management with the Victron Cyrix-ct 12/24V-230A. Whether you're building a new off-grid setup or upgrading an existing split charge system, this VSR delivers the precision and durability needed for demanding mobile and marine applications. Add it to your system now and ensure your auxiliary batteries are always ready when you need them.
SKU: Vic-CYR010230010
SPECIFICATIONS
Specifications
| Auto Ranging | 12/24 V |
|---|---|
| LED Status Indication | Yes |
| Continuous Current | 230 A |
| Cranking Rating (5 Seconds) | 500 A |
| Connect Voltage With Intelligent Trend Detection | From 13 V to 13.8 V and 26 to 27.6 V |
| Disconnect Voltage With Intelligent Trend Detection | From 11 V to 12.8 V and 22 to 25.7 V |
| Current Consumption When Open | <4 mA |
| Current Consumption When Closed | 12 V: 320 mA; 24 V: 180 mA |
| Operating Temperature Range | -40 to +60 °C |
| Start Assist | Yes (Cyrix remains engaged during 30 seconds) |
| Control Cable Included (Length 1 m) | Yes |
| Protection Category | IP54 |
| Long Bolts | 16 mm (M8) |
| Weight | 0.27 kg (0.6 lbs) |
| Dimensions H x W x D | 65 x 100 x 50 mm (2.6 x 4.0 x 2.0 in) |
| SKU: | Vic-CYR010230010 |
| Barcode: | 8719076022206 |
| Model #: | CYR010230010 |
| MPN: | CYR010230010 |
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
