{"product_id":"victron-cyrix-li-ct-intelligent-li-ion-battery-com","title":"Victron Energy - 12\/24V - Cyrix-Li-ct Intelligent Li-ion Battery Combiner Kit 12\/24V-120A VSR","description":"\u003ch2\u003eVictron Cyrix-Li-ct: Intelligent Battery Combiner for LiFePO4 and Lead Acid Systems\u003c\/h2\u003e\n\u003ch3\u003eSeamless Parallel Connection Between Starter and Lithium Batteries\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eVictron Cyrix-Li-ct 12\/24V-120A\u003c\/strong\u003e is a microprocessor-controlled battery combiner engineered to parallel a lead acid starter battery with a LiFePO4 (lithium iron phosphate) service battery. It integrates directly with the Victron VE.Bus BMS, providing a critical layer of protection against cell undervoltage, overvoltage, and overtemperature events. This ensures your lithium battery bank remains within safe operating limits while maintaining the starter battery's charge.\u003c\/p\u003e\n\u003cp\u003eUnlike generic voltage sensing relays (VSRs), the Cyrix-Li-ct responds to BMS control signals rather than voltage alone. This prevents premature disconnection or unintended cycling, a common issue with standard combiners in lithium systems. The result is a more stable, reliable dual-battery setup for caravans, motorhomes, marine vessels, and off-grid installations.\u003c\/p\u003e\n\u003ch3\u003eHow the Cyrix-Li-ct Protects Your Lithium Investment\u003c\/h3\u003e\n\u003cp\u003eLithium batteries require precise charge and discharge management. The Cyrix-Li-ct acts as a gatekeeper, engaging only when the BMS confirms safe conditions. It disengages instantly if the BMS signals a fault, such as cell overvoltage or high temperature, isolating the lithium battery from the alternator or charger. This rapid response helps prevent irreversible cell damage and extends battery service life.\u003c\/p\u003e\n\u003cp\u003eKey protective functions include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMS-controlled engagement:\u003c\/strong\u003e The relay closes only when the VE.Bus BMS Charge Disconnect output is high, ensuring charging only occurs under safe conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmediate disengagement:\u003c\/strong\u003e If the BMS control input becomes free floating (indicating a fault), the Cyrix opens without delay, halting current flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUndervoltage lockout:\u003c\/strong\u003e The relay disengages when battery voltage drops below 13.2V (12V system) or 26.4V (24V system), preventing deep discharge of the starter battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransient voltage suppression:\u003c\/strong\u003e A built-in suppressor limits voltage spikes during sudden disconnection, protecting sensitive electronics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStart Assist: Emergency Power When You Need It\u003c\/h3\u003e\n\u003cp\u003eA standout feature is the \u003cstrong\u003estart assist function\u003c\/strong\u003e. A short negative pulse on the control input closes the relay for 30 seconds, allowing the lithium service battery to assist a depleted starter battery. This can be a lifesaver in remote locations, providing a temporary boost without manual jump leads. The function is easily activated via a momentary switch connected to the BMS interface.\u003c\/p\u003e\n\u003ch3\u003eEngineered for Demanding Environments\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-Li-ct is built to withstand the rigours of mobile and marine applications. Its compact, lightweight design (46 x 46 x 80 mm, 0.11 kg) simplifies installation in tight spaces. The IP54 protection rating guards against dust ingress and water splashes, while the robust 3\/8\"-16 (Approx. M10) stud terminals accommodate heavy-duty lugs up to 4\/0 AWG (approx. 95 mm²), ensuring low-resistance connections for 120 A continuous current.\u003c\/p\u003e\n\u003cp\u003eAn integrated LED provides clear visual feedback on system status, aiding diagnostics and troubleshooting. The front-facing wiring diagram and technical reference further streamline setup, reducing installation time and potential errors.\u003c\/p\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaravans and motorhomes:\u003c\/strong\u003e Automatically charge the house lithium battery from the alternator while protecting the starter battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine systems:\u003c\/strong\u003e Combine a lead acid engine battery with a LiFePO4 house bank, with BMS-coordinated safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-grid solar:\u003c\/strong\u003e Integrate with Victron inverter\/chargers and MPPT controllers for a fully managed energy system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial vehicles:\u003c\/strong\u003e Maintain auxiliary lithium batteries for lifts, refrigeration, or onboard equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation and Compatibility Notes\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-Li-ct requires a Victron VE.Bus BMS for operation; it is not a standalone voltage sensing relay. For systems without a VE.Bus BMS, consider the Victron Cyrix-ct or BatteryProtect range. Always refer to the Victron wiring guidelines and ensure cable sizing matches the 120 A rating. Note typical de-rating factors apply for continuous high-current use in elevated temperatures.\u003c\/p\u003e\n\u003ch3\u003eTake Control of Your Dual-Battery System\u003c\/h3\u003e\n\u003cp\u003eUpgrade your energy management with the \u003cstrong\u003eVictron Cyrix-Li-ct 12\/24V-120A\u003c\/strong\u003e. Designed for seamless integration with Victron lithium batteries and BMS, it delivers the precision and protection your system demands. Order today to ensure reliable, automated battery combining on your next adventure.\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;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eCYR010120412\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;\"\u003eDescription\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eIntelligent Li-ion 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;\"\u003eModel\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eCyrix-Li-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;\"\u003eBattery Combination\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eLead acid starter battery and a LiFePO4 battery\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 And Breaking Capacity At 12 V Or 24 V\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;\"\u003eBreaking Capacity At 48 V\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003en. 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;\"\u003eControl Input\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eThe Cyrix engages when the control input is high (appr. battery voltage); The Cyrix disengages when the control input is left free floating or pulled low\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 (12 V System)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e13.4 V \u0026lt; V \u0026lt; 13.7 V: 120 s; 13.7 V \u0026lt; V \u0026lt; 13.9 V: 30 s; V \u0026gt; 13.9 V: 4 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;\"\u003eConnect Voltage (24 V System)\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003e26.8 V \u0026lt; V \u0026lt; 27.4 V: 120 s; 27.4 V \u0026lt; V \u0026lt; 27.8 V: 30 s; V \u0026gt; 27.8 V: 4 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;\"\u003eDisconnect Condition\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eWhen its control output becomes free floating, signalling cell over voltage or cell over temperature, and\/or when battery voltage drops below 13.2 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;\"\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)\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 Function\u003c\/th\u003e\n\u003ctd style=\"border:1px solid #d9d9d9; padding:8px; vertical-align:top;\"\u003eA short negative pulse will close the relay during 30 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Victron","offers":[{"title":"Default Title","offer_id":52364355928347,"sku":"Vic-CYR010120412","price":114.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0854\/3354\/9083\/files\/Vic-CYR010120412-01.jpg?v=1781658046","url":"https:\/\/www.nbcampingequipment.com.au\/products\/victron-cyrix-li-ct-intelligent-li-ion-battery-com","provider":"NB Camping Equipment","version":"1.0","type":"link"}