Victron Cyrix-ct Intelligent Battery Combiner 12/24V-230A VSR
230A Continuous, Intelligent Trend Detection, Start Assist, IP54
Exotronic 300A Red On Off Battery SwitchDESCRIPTION
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
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.
Exotronic provides high-quality products and solutions tailored for B2B and commercial customers, including commercial businesses, caravan manufacturers, marine electricians, OEMs, as well as emergency services, and more.










