Victron Energy Cyrix-ct 12/24-120 Intelligent Battery Combiner CYR010120011R

The Victron Energy CYR010120011R Cyrix-ct 12/24-120 is an intelligent battery combiner designed to automatically connect and disconnect battery banks based on system voltage and charging conditions. It supports both 12V and 24V systems with automatic voltage detection and provides a 120A continuous current rating for compatible battery installations.

Unlike a simple voltage-controlled relay, the Cyrix-ct uses intelligent voltage trend detection to evaluate whether battery voltage is increasing or decreasing before changing its connection state. This helps prevent unwanted switching caused by short-duration high-current loads or temporary voltage changes. 

Key Technology

• 120A Continuous Current
  Supports a 120A continuous current rating with a 180A cranking rating for 5 seconds, providing robust battery-combining capability for compatible electrical systems.

• Automatic 12V / 24V Detection
  The Cyrix-ct automatically detects whether it is installed in a 12V or 24V system, simplifying integration into compatible battery configurations.

• Intelligent Battery Monitoring
  Rather than switching solely at a fixed voltage and time delay, the Cyrix monitors the general battery-voltage trend and adjusts its switching behavior accordingly.

• Bidirectional Voltage Sensing
  Monitors the voltage of both connected batteries, allowing the combiner to engage when either battery side is receiving an appropriate charging voltage.

• Virtually No Voltage Loss
  Provides an efficient alternative to diode battery isolators. Victron states that its battery combiners have virtually no voltage loss, eliminating the need to increase alternator or charger output voltage to compensate for diode losses.

• Start Assist Function
  Supports manual battery paralleling using a push button or switch. When activated, the Cyrix remains engaged for 30 seconds, which can assist when the starter battery is discharged or damaged. 

• Overtemperature Protection
  The Cyrix automatically disengages if excessive contact temperature is detected and reconnects after it has cooled down. 

• IP54 Protection
  Features an IP54 protection category for added protection in compatible electrical installations. 

• M6 Power Connections
  The 120A model uses long M6 connection bolts designed to accommodate more than one power cable when required by the installation. 

Best Uses

• Starter & Auxiliary Battery Systems
  Ideal for automatically connecting an auxiliary battery to the starter battery once an appropriate charging voltage is detected.

• Alternator Charging Systems
  Allows an alternator connected to the starter battery to automatically provide parallel charging to a compatible auxiliary battery bank once the starter battery reaches the required connect voltage. 

• Vehicle & Mobile Power Systems
  Suitable for compatible vehicle, RV, mobile, and specialty electrical systems using separate starter and auxiliary battery banks.

• Marine Battery Systems
  Useful for compatible marine installations where starter, accessory, and other battery banks need automatic charging coordination.

• Dual-Battery Installations
  Provides automatic battery combining and separation without requiring the operator to manually manage a high-current battery switch during normal charging operation.

• Emergency Starting Assistance
  The Start Assist feature allows the connected batteries to be temporarily paralleled when additional starting support is needed.

Product Specifications

Intelligent Battery Management Without Diode Voltage Loss

The Victron Energy CYR010120011R Cyrix-ct 12/24-120 provides intelligent automatic control between compatible battery banks while maintaining virtually no voltage loss across the combiner. Its 120A continuous rating, automatic 12V/24V detection, bidirectional voltage sensing, intelligent switching logic, Start Assist, and thermal protection make it a practical solution for properly designed dual-battery and multi-battery electrical systems.

Why Buy From US Solar Supplier

US Solar Supplier is an American-founded company based in Kentucky dedicated to offering top-quality solar components from trusted manufacturers. We provide competitive pricing, dependable inventory, and products backed by warranties you can trust.

Our inventory is updated daily with the latest solar technologies, and our experienced team is ready to assist with product selection, system design, and installation guidance.

Need Assistance?

Have questions before you order? Call 1-800-230-7004 to speak with our knowledgeable support team. We’re here to help with product details, compatibility questions, or purchasing support.