VICTRON ENERGY ● CYRIX-I SERIES Victron Cyrix 24/48-400A Intelligent Battery Combiner Automatic 24V/48V Sensing | 400A Continuous Current | UK Solar, Marine & Vehicle Systems The Victron Cyrix 24/48-400A Intelligent Battery Combiner is a microprocessor-controlled heavy-duty relay designed to automatically connect and disconnect battery banks in 24V or 48V DC systems. This intelligent device ensures efficient charging by paralleling batteries when a charge source is detected and isolating them to prevent unwanted discharge. Ideal for multi-battery setups in marine, RV, off-grid solar, and emergency vehicle applications, the Cyrix-i 24/48-400A offers a superior alternative to traditional diode isolators by eliminating voltage loss, ensuring your alternators and battery chargers deliver their full potential. SYSTEM COMPATIBILITY: Specifically designed for 24V and 48V DC systems with automatic voltage detection. Key Features ▶ Intelligent Battery Monitoring — Prevents unwanted switching by analysing voltage trends, not just fixed thresholds. ▶ Zero Voltage Loss — Functions as a superior replacement for diode isolators, ensuring full charging voltage reaches your batteries. ▶ Prioritises Starter Battery — Ensures the starter battery is charged first before connecting auxiliary batteries for parallel charging. ▶ Bidirectional Voltage Sensing — Monitors both connected batteries, engaging even if the accessory battery is being charged. ▶ Emergency Parallel Connection — Allows manual engagement for 30 seconds via a push button or switch to assist with a discharged starter battery. ▶ Selectable Timing Profiles — Offers four different switch timing profiles to adapt to various system requirements. ▶ Remote Monitoring Output — Includes a micro switch for remote status indication. Technical Specifications Parameter Value Manufacturer Victron Energy Model Cyrix-i 24/48-400A MPN / SKU CYR020400000 Product Type Intelligent Battery Combiner / Automatic Charge Relay System Voltage 24V / 48V (Auto-ranging) Input Voltage Range 16 - 72 VDC Continuous Current 400A Peak Current (1 second) 2000A Current Consumption (Open) <4 mA Emergency Start Function Yes (30 seconds) Remote Monitoring Micro switch output Status Indication Bicolour LED Protection Class IP54 Dimensions (H x W x D) 78 x 102 x 110 mm Weight 0.9 kg Intelligent Battery Management The Cyrix-i 24/48-400A goes beyond simple voltage-based switching. Its advanced software monitors the general trend of battery voltage (increasing or decreasing) and only reverses a previous action if the trend has genuinely changed over a specific period. This intelligent approach prevents nuisance disconnections during short, high-amperage loads or failures to connect large, discharged battery banks. With four selectable switch timing profiles, the Cyrix-i can be configured to suit various battery types and system demands, offering flexibility and enhanced reliability for your power management needs. Typical Applications Application Description Marine & RV Systems Efficiently manage charging of house and starter batteries from a single alternator or charger. Off-Grid Solar Installations Optimise charging of multiple battery banks in remote power systems. Emergency & Commercial Vehicles Ensures critical starter batteries are prioritised while auxiliary equipment batteries are charged. Backup Power Systems Manages parallel battery banks for increased capacity and reliability. Built-In Protection Functions The Victron Cyrix 24/48-400A is equipped with several protection features to ensure safe and reliable operation. These include overvoltage disconnect for 24V and 48V systems, automatic shutdown for temperature protection, and intelligent monitoring to prevent unwanted switching due to transient voltage fluctuations. The unit also features an IP54 protection rating, offering resistance against dust and splashing water. Common Questions What is the primary function of the Cyrix 24/48-400A? The Cyrix 24/48-400A automatically connects two or more battery banks in parallel when a charging source is present, ensuring all batteries are charged. It then disconnects them when the voltage drops, preventing discharge of one battery into another. How does it differ from a diode battery isolator? Unlike diode isolators, the Cyrix-i has virtually no voltage loss, meaning your alternator or charger voltage reaches the batteries unchanged, maximising charging efficiency. Diode isolators typically incur a voltage drop, which can lead to undercharging. Can I use this Cyrix model with a 12V system? No, the Victron Cyrix 24/48-400A is specifically designed for 24V and 48V DC systems and will automatically detect between these two voltages. For 12V or 12/24V auto-ranging systems, a different Cyrix-i model would be required. What is the "Emergency Start" function? The emergency start function allows you to manually connect the battery banks in parallel for 30 seconds using a push button or switch. This is useful if your primary starter battery is discharged and you need to use the auxiliary battery to start an engine. Installation Notes Professional Installation: Installation should be carried out by a qualified professional to ensure correct wiring and optimal performance. Common Negative: The Cyrix-i requires an installation with a common negative connection for both batteries. Fuse Protection: Always install an appropriately sized fuse in series with the Cyrix, not exceeding 400A, and in accordance with cable cross-section. Placement: For best results, position the Cyrix-i closest to the smallest battery, typically the starter battery. Cable Sizing: Ensure all battery cables are correctly sized for the 400A continuous current rating to prevent overheating and voltage drop. Before You Buy Verify System Voltage: Confirm your battery system operates at either 24V or 48V DC. This model is not suitable for 12V systems. Current Requirements: Ensure the 400A continuous current rating meets or exceeds the maximum charging current of your system. Installation Expertise: Consider whether you have the necessary expertise for installation or if you will require a qualified installer. Documentation: For detailed technical information, refer to the official Victron Energy datasheet and manual for the Cyrix-i 24/48-400A. Always consult the manufacturer's official documentation for complete specifications and installation guidelines. Product specifications are subject to change by the manufacturer.
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