{"product_id":"victron-cyrix-ct-intelligent-battery-combiner-kit","title":"Victron Energy - 12\/24V - Cyrix-ct Intelligent Battery Combiner Kit 12\/24V-120A VSR","description":"\u003ch2\u003eVictron Cyrix-ct 120A Intelligent Battery Combiner Kit: Reliable Dual-Battery Management for 12V and 24V Systems\u003c\/h2\u003e\n\u003ch3\u003eAdvanced Voltage-Sensitive Relay for Automatic Battery Isolation and Parallel Charging\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eVictron Cyrix-ct 120A\u003c\/strong\u003e is a microprocessor-controlled \u003cstrong\u003ebidirectional voltage sensitive relay (VSR)\u003c\/strong\u003e designed to intelligently manage multiple battery banks in vehicles, boats, and off-grid installations. This kit includes the relay, heavy-duty cables, and terminals, providing a complete solution for adding a second or third battery without modifying factory wiring. The Cyrix-ct automatically parallels the starter and auxiliary batteries when a charging source is present and isolates them when charging stops, ensuring the starting battery is always protected from deep discharge.\u003c\/p\u003e\n\u003cp\u003eUnlike basic voltage-sensing relays, the Cyrix-ct employs \u003cstrong\u003eintelligent battery monitoring\u003c\/strong\u003e to prevent rapid cycling. Its software analyses voltage trends over time, not just instantaneous thresholds, so it only switches when a genuine change in charge state is detected. This eliminates unnecessary relay chatter and extends the life of both the relay and connected batteries. The unit is auto-ranging for \u003cstrong\u003e12V and 24V DC systems\u003c\/strong\u003e, making it versatile for cars, trucks, motorhomes, marine vessels, and solar setups.\u003c\/p\u003e\n\u003ch3\u003eKey Features of the Cyrix-ct 120A Combiner\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 5 seconds, suitable for alternators up to 150 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBidirectional operation\u003c\/strong\u003e – engages when either battery bank receives charge, from an alternator, shore charger, or solar controller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrend-based switching logic\u003c\/strong\u003e prevents false triggering and relay cycling, improving reliability in fluctuating voltage conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmergency start assist\u003c\/strong\u003e – a momentary switch can be wired to the dedicated terminal to parallel batteries for 30 seconds, aiding engine cranking if the starter battery is low\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow power consumption\u003c\/strong\u003e – draws less than 4 mA when open, minimising drain on the batteries when the engine is off\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP54 protection\u003c\/strong\u003e – resistant to dust and water splashes, suitable for engine bays and exposed marine environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact design\u003c\/strong\u003e – 46 x 46 x 80 mm footprint allows installation in tight spaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eComplete Installation Kit with Premium Cables\u003c\/h3\u003e\n\u003cp\u003eThis kit includes everything needed for a professional installation. The supplied cables are sized for the 120 A rating, with a 6-metre red 10 mm² power cable for the main run and a 0.5-metre black 10 mm² ground cable. A pre-assembled control cable with an M8 lug and 6.3 mm fast-on terminal simplifies the start assist wiring. Copper lugs with insulation sleeves (two M8 and four M6) and cable ties are provided to ensure secure, tidy connections. No cutting into factory wiring is required, preserving vehicle warranties and reducing installation time.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose the Victron Cyrix-ct Over Standard Relays?\u003c\/h3\u003e\n\u003cp\u003eConventional VSRs often rely on simple voltage thresholds with fixed time delays, which can lead to nuisance switching when loads cause temporary voltage dips. The Cyrix-ct’s intelligent algorithm evaluates the voltage trend over a period, reversing a connection only if the trend has genuinely reversed. This is particularly beneficial in systems with variable loads, such as fridges or inverters, where voltage can fluctuate without indicating a change in charge state. The result is stable, predictable battery management that reduces wear on contacts and prevents unintended discharge of the starter battery.\u003c\/p\u003e\n\u003cp\u003eAdditionally, the bidirectional design means the relay will close not only when the engine is running but also when a mains charger or solar regulator is connected to the auxiliary bank. This allows all batteries to benefit from any charging source, maximising energy utilisation and simplifying system design.\u003c\/p\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4WD and camping vehicles\u003c\/strong\u003e – keep the cranking battery isolated while running accessories from a deep-cycle auxiliary battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine installations\u003c\/strong\u003e – automatically combine battery banks during shore power charging or alternator operation, with emergency parallel for engine starting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaravans and motorhomes\u003c\/strong\u003e – charge house batteries from the vehicle alternator while driving, and from solar when parked\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial vehicles\u003c\/strong\u003e – manage multiple battery banks in trucks, buses, and emergency vehicles with high alternator outputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-grid solar systems\u003c\/strong\u003e – use as a battery combiner to share charge between banks without complex wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Considerations\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-ct requires a common negative reference between all batteries, which is standard in most 12V and 24V vehicle and marine systems. The relay should be mounted close to the batteries, with the included cables cut to length as needed. Fusing is recommended on all positive connections (not included) to protect against short circuits. The start assist terminal can be connected to a momentary push-button switch on the dashboard for convenient emergency starting.\u003c\/p\u003e\n\u003cp\u003eWith its robust construction, intelligent control, and comprehensive kit contents, the Victron Cyrix-ct 120A provides a reliable and long-lasting solution for dual-battery management. Whether you are building a touring setup, upgrading a marine electrical system, or adding redundancy to an off-grid power installation, this combiner delivers consistent performance and peace of mind.\u003c\/p\u003e\n\u003cp\u003eEquip your vehicle or vessel with the Victron Cyrix-ct 120A Intelligent Battery Combiner Kit today and ensure your batteries are always charged and ready, without the risk of a flat starter battery.\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;\"\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;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eCYR010120110R\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;\"\u003eRelay Type\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eBidirectional voltage sensitive relay\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 Seconds)\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;\"\u003eMaximum Alternator Rating\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e150 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;\"\u003eAuto Ranging\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e12\/24 V\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 (Delay Appr. 10 Minutes)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e13 V \/ 26 V\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 (Delay Appr. 4 Seconds)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e13.8 V \/ 27.6 V\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 (Delay Appr. 10 Minutes)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e12.8 V \/ 25.6 V\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 (Delay Appr. 4 Seconds)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e11.8 V \/ 23.6 V\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;\"\u003eOver Voltage Disconnect\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e16 V \/ 32 V\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;\"\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;\"\u003eStart Assist\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eYes, 30 sec\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;\"\u003ePower Studs\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eM6\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;\"\u003eInstallation Requirement\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e12 V or 24 V installations with a negative common\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;\"\u003eIncluded Red Cable\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e6 m red 10 mm² cable\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;\"\u003eIncluded Black Cable\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e0.5 m black 10 mm² cable\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;\"\u003eIncluded Control Cable Assembly\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e0.2 m black 1.5 mm² cable assembly with M8 lug and 6.3 mm fast on terminal\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;\"\u003eIncluded M8 Cable Lugs\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e2 pcs M8 cable lug with insulation sleeve\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;\"\u003eIncluded M6 Cable Lugs\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e4 pcs M6 cable lug with insulation sleeve\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;\"\u003eIncluded Cable Ties\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e4 pcs cable tie 150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Victron","offers":[{"title":"Default Title","offer_id":52364355141915,"sku":"Vic-CYR010120110R","price":149.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0854\/3354\/9083\/files\/Vic-CYR010120110R-01.jpg?v=1781658046","url":"https:\/\/www.nbcampingequipment.com.au\/products\/victron-cyrix-ct-intelligent-battery-combiner-kit","provider":"NB Camping Equipment","version":"1.0","type":"link"}