{"product_id":"victron-cyrix-ct-intelligent-battery-combiner-12-2","title":"Victron Energy - 12\/24V - Cyrix-ct Intelligent Battery Combiner 12\/24V-120A VSR","description":"\u003ch2\u003eVictron Cyrix-ct 120A Intelligent Battery Combiner for Dual Battery Systems\u003c\/h2\u003e\n\u003ch3\u003eAdvanced Voltage Sensing Relay with Trend Detection for Reliable Parallel Charging\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eVictron Cyrix-ct 12\/24V-120A\u003c\/strong\u003e is a microprocessor-controlled \u003cstrong\u003eintelligent battery combiner\u003c\/strong\u003e that functions as a bidirectional \u003cstrong\u003evoltage sensitive relay (VSR)\u003c\/strong\u003e. Unlike conventional split charge relays that rely on simple voltage thresholds and fixed time delays, the Cyrix-ct analyses the overall voltage trend to prevent nuisance switching. This ensures your auxiliary battery bank charges reliably from the alternator or mains charger without premature disconnection under heavy loads or reconnection when surface charge dissipates.\u003c\/p\u003e\n\u003cp\u003eEngineered for \u003cstrong\u003e12V and 24V automotive and marine electrical systems\u003c\/strong\u003e, the Cyrix-ct auto-detects system voltage and provides a continuous current rating of 120 A, making it suitable for charging large domestic battery banks, bow thruster batteries, and other onboard equipment. Its bidirectional sensing allows the combiner to engage when either battery reaches the connect voltage, so charging sources on either side can parallel the banks automatically.\u003c\/p\u003e\n\u003ch3\u003eIntelligent Trend Detection Eliminates Unwanted Cycling\u003c\/h3\u003e\n\u003cp\u003eStandard voltage-controlled relays often disconnect a battery when a short, high-current load causes a momentary voltage dip, or fail to connect a deeply discharged bank because the voltage collapses below the disconnect threshold immediately after engagement. The Cyrix-ct’s software monitors the rate and direction of voltage change over time, reversing a previous action only if the trend has genuinely reversed. The time delay adapts based on the deviation from the trend, providing stable operation in demanding conditions.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e120 A continuous current rating\u003c\/strong\u003e with 180 A cranking assist for emergency parallel starts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12\/24 V auto-ranging\u003c\/strong\u003e detects system voltage automatically, no manual configuration needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBidirectional voltage sensing and dual power supply\u003c\/strong\u003e allows engagement from either battery, even if one is deeply discharged\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStart Assist function\u003c\/strong\u003e via push button or switch provides 30-second emergency parallel connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-temperature protection\u003c\/strong\u003e disengages the relay if contact temperature becomes excessive, re-engaging after cooling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVirtually zero voltage drop\u003c\/strong\u003e across the contacts, eliminating the need to increase alternator or charger output voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrioritises starter battery\u003c\/strong\u003e by connecting auxiliary banks only after the starter reaches the connect voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact IP54-rated housing\u003c\/strong\u003e (46 x 46 x 80 mm) withstands dust and water spray in engine bays and marine compartments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow power consumption:\u003c\/strong\u003e less than 4 mA when open, 220 mA (12 V) or 120 mA (24 V) when closed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13 mm (M6) long stud terminals\u003c\/strong\u003e allow secure connection of multiple heavy-duty cable lugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReliable Parallel Charging Without Voltage Loss\u003c\/h3\u003e\n\u003cp\u003eDiode-based battery isolators introduce a voltage drop of 0.6–0.7 V, which can prevent full charging unless the alternator or charger is voltage-boosted. The Cyrix-ct uses a high-current relay with negligible contact resistance, so your batteries receive the full charging voltage. This makes it a direct, efficient replacement for diode isolators in \u003cstrong\u003e12V dual battery systems\u003c\/strong\u003e and \u003cstrong\u003e24V marine setups\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eEmergency Start Assist for Peace of Mind\u003c\/h3\u003e\n\u003cp\u003eIf your starter battery becomes discharged or damaged, the Cyrix-ct can be manually engaged using a momentary push button or switch connected to the Start Assist terminal. The relay remains closed for 30 seconds, allowing you to draw power from the auxiliary bank to crank the engine. This feature is invaluable for remote travel, off-grid work sites, and marine applications where a flat starter battery could leave you stranded.\u003c\/p\u003e\n\u003ch3\u003eDesigned for Harsh Environments\u003c\/h3\u003e\n\u003cp\u003eWith an operating temperature range of -40 to +60 °C and an IP54 protection rating, the Cyrix-ct is built to perform in engine compartments, bilges, and exposed vehicle installations. The fully sealed housing resists dust ingress and water spray, while the robust M6 stud terminals accept heavy-gauge cable lugs for secure, low-resistance connections.\u003c\/p\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCharging a second battery in \u003cstrong\u003e4WD, caravan, and camper trailer dual battery systems\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMarine installations with separate start and house battery banks\u003c\/li\u003e\n\u003cli\u003eBow thruster and windlass battery charging\u003c\/li\u003e\n\u003cli\u003eCommercial vehicles and agricultural machinery with auxiliary power requirements\u003c\/li\u003e\n\u003cli\u003eOff-grid solar systems where multiple battery banks need to be combined during charging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation and Wiring\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-ct features clearly labelled M6 stud terminals for Battery 1 (Terminal 87) and Battery 2 (Terminal 30), plus spade terminals for the negative sensing wire (Terminal 86) and optional Start Assist switch (Terminal 85). A wiring diagram is included in the product images to guide installation. For systems requiring multiple engage\/disengage profiles, consider the \u003cstrong\u003eVictron Cyrix-i 400\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Your Dual Battery System with Intelligent Control\u003c\/h3\u003e\n\u003cp\u003eReplace unreliable diode isolators and basic voltage-sensing relays with the \u003cstrong\u003eVictron Cyrix-ct 120A Intelligent Battery Combiner\u003c\/strong\u003e. Its trend-detection logic, bidirectional sensing, and emergency start assist provide dependable parallel charging for your auxiliary batteries. Order today to ensure your onboard power system operates efficiently and reliably, wherever your journey takes you.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable class=\"product-specifications\" style=\"width:100%; border-collapse:collapse; border:1px solid #d9d9d9; table-layout:auto;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eVictron Part Number\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eCYR010120011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eModel\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eCyrix-ct 12\/24-120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eIntelligent Battery Combiner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eSystem Voltage\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e12\/24 V Auto Ranging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eLED Status Indication\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eContinuous Current\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e120 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eCranking Rating (5 s)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e180 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eConnect Voltage\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eFrom 13 V to 13.8 V and 26 to 27.6 V, with intelligent trend detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eDisconnect Voltage\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eFrom 11 V to 12.8 V and 22 to 25.7 V, with intelligent trend detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eCurrent Consumption When Open\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e\u0026lt;4 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eCurrent Consumption When Closed\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e12 V: 220 mA; 24 V: 120 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e-40 to +60 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eStart Assist\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eYes (Cyrix remains engaged during 30 s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eControl Cable Included (Length 1 m)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eProtection Category\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eIP54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eWeight\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e0.11 kg (0.24 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eDimensions (H x W x D)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e46 x 46 x 80 mm (1.8 x 1.8 x 3.2 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #d9d9d9; padding:8px; text-align:left; width:35%; vertical-align:top;\"\u003eLong Bolts\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e13 mm (M6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Victron","offers":[{"title":"Default Title","offer_id":52364354715931,"sku":"Vic-CYR010120011","price":68.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0854\/3354\/9083\/files\/Vic-CYR010120011-01.jpg?v=1781658044","url":"https:\/\/www.nbcampingequipment.com.au\/products\/victron-cyrix-ct-intelligent-battery-combiner-12-2","provider":"NB Camping Equipment","version":"1.0","type":"link"}