VICTRON ENERGY ▶ CYRIX-CT SERIES Victron Cyrix-ct 230A 12/24V Intelligent Battery Combiner Automatic Voltage Sensing | Bi-Directional Charging | 230A Continuous The Victron Cyrix-ct 230A 12/24V Intelligent Battery Combiner is a microprocessor-controlled heavy-duty relay designed to automatically manage two independent battery banks in 12V or 24V DC systems. This intelligent device optimises power sharing by connecting batteries in parallel when one is being charged and disconnecting them when the voltage drops, preventing discharge. Ideal for vehicle battery systems, marine applications, and off-grid setups, the Cyrix-ct 230A ensures efficient charging from sources like alternators, solar panels, or mains chargers. It acts as an excellent replacement for diode isolators, eliminating voltage loss and enhancing charging efficiency across both battery banks. IMPORTANT COMPATIBILITY: May not be suitable for Euro 6 or later smart alternators. Both battery banks must have the same rated voltage. Key Features ▶ Intelligent Battery Monitoring — Prevents rapid switching and optimises charge sharing without over-discharging. ▶ Automatic Voltage Detection — Seamlessly adapts to both 12V and 24V DC electrical systems. ▶ Bi-Directional Power Flow — Allows charging from any connected source to both battery banks. ▶ Zero Voltage Loss — Ensures efficient charging without the inefficiencies of diode isolators. ▶ Start Assist Function — Provides a manual override for emergency engine starting from the auxiliary battery. ▶ Integrated Protection — Features over-current and over-temperature protection for reliable operation. Technical Specifications Parameter Value Continuous Current 230A Cranking Current (5 secs) 500A Rated Voltage 12V / 24V (Auto Detect) Standby Consumption <4mA Terminal Size M8 Dimensions (H x W x D) 65 x 100 x 50 mm Weight 270g Operating & Power Guidance The Cyrix-ct 230A operates as a microprocessor-controlled relay, automatically connecting two battery banks in parallel when the voltage of one battery reaches a pre-set level, indicating it is being charged. It disconnects the batteries when the voltage drops below a float level, preventing discharge. Its intelligent software monitors voltage trends, rather than just instantaneous voltage, to prevent unwanted rapid switching (often called 'chatter') that can occur with short, high-amperage loads or when connecting a large, discharged battery bank. This ensures stable and reliable operation. In typical setups, the alternator is connected directly to the starter battery. The Cyrix-ct then senses when the starter battery has reached its connect voltage and engages to allow parallel charging of the auxiliary battery. Its bi-directional sensing means it will also engage if the auxiliary battery is being charged (e.g., by solar or a mains charger), allowing that charge to flow to the starter battery. Typical Applications Application Description Motorhomes & Caravans Efficiently share alternator charge with leisure batteries and solar/mains charge with starter batteries. Boats & Marine Vessels Manage charging between engine start and house batteries from various onboard sources. Utility & Service Vehicles Ensure critical equipment batteries are charged while maintaining starter battery readiness. Off-Grid & Remote Systems Optimise power distribution and charging between primary and secondary battery banks. Built-In Protection Functions The Victron Cyrix-ct 230A incorporates robust protection features to ensure system safety and longevity. It includes protection against over-current and will disengage in case of excessive contact temperature, re-engaging once it has cooled down. The intelligent battery monitoring software also helps prevent over-discharge of connected batteries by managing connection and disconnection based on voltage trends. The unit itself is rated IP54, offering protection against dust and splashed water. Common Questions What is an Intelligent Battery Combiner? An Intelligent Battery Combiner, like the Cyrix-ct 230A, is a microprocessor-controlled relay that automatically connects two battery banks in parallel when a charging voltage is detected on either bank, and disconnects them when charging stops. This ensures both batteries are charged efficiently without over-discharging one from the other. How does the Cyrix-ct 230A handle different battery voltages? The Cyrix-ct 230A features automatic voltage detection, allowing it to seamlessly adapt to both 12V and 24V DC electrical systems. It will automatically configure itself to the system voltage upon installation. Can I use this with my vehicle's 'smart' alternator? Smart alternators, commonly found in Euro 6 or later engines, may not be compatible with Voltage Sensing Relay (VSR) technology such as this battery combiner. It is crucial to verify compatibility with your vehicle's specific alternator type before purchase. What is the purpose of the 'Start Assist' feature? The 'Start Assist' function provides a manual override to temporarily connect the two battery banks in parallel for 30 seconds. This is particularly useful in emergency situations where the main starter battery is discharged or damaged, allowing the auxiliary battery to assist with engine start-up. It requires an external push-button switch (not included). Installation Notes Install the Cyrix-ct 230A between the positive terminals of the two batteries or battery banks. Ensure appropriate fuses are installed in series with the positive cables, sized according to wire cross-section but not exceeding 230A. The negative terminals of both batteries should be linked directly or connected through a common negative ground. The Cyrix-ct negative input connects to this common negative. For optimal performance, place the Cyrix-ct unit closest to the smallest battery in the system, typically the starter battery. Professional installation by a qualified auto electrician or marine engineer is highly recommended to ensure correct wiring and safe operation. Before You Buy Verify the compatibility of this Voltage Sensing Relay with your vehicle's alternator, especially if it's a Euro 6 or later 'smart' alternator. Confirm that both battery banks in your system have the same nominal voltage (e.g., both 12V or both 24V). Ensure the 230A continuous current rating is sufficient for your application's peak and continuous power demands. Consider if you require the 'Start Assist' function and plan for the installation of an external push-button switch, as it is not included. Review the full user manual for detailed wiring diagrams and operational instructions to ensure suitability for your specific setup. Always verify product specifications and compatibility with your specific system requirements before purchase. Professional installation is recommended. This product is covered by a 5-year manufacturer warranty.
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