{"product_id":"victron-cyrix-li-ct-12-24v-120a-battery-combiner","title":"Victron Cyrix-Li-ct 12\/24V-120A intelligent Li-ion battery combiner - CYR010120412","description":"\u003ch1 style=\"color: #f87c24;\"\u003eCyrix-Li-ct 12\/24V-120A Intelligent Li-ion Battery Combiner\u003c\/h1\u003e\n\n\u003cp\u003eThe Victron Cyrix-Li-ct is a microprocessor-controlled battery combiner designed specifically for lithium-ion battery systems operating at 12V or 24V. It replaces a conventional VSR (voltage-sensitive relay) in installations where a Li-ion battery is combined with a starter or auxiliary lead-acid battery. The unit is controlled directly by the battery management system (BMS), ensuring the combiner only connects batteries when the BMS permits it.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRated at 120A continuous current, suitable for demanding charging and load-sharing applications.\u003c\/li\u003e\n  \u003cli\u003eCompatible with both 12V and 24V systems, covering the most common marine, vehicle and off-grid voltage configurations.\u003c\/li\u003e\n  \u003cli\u003eControlled via a dedicated BMS charge-disconnect or load-disconnect signal, not by voltage alone, preventing unsafe charge states.\u003c\/li\u003e\n  \u003cli\u003eMicroprocessor-controlled logic ensures the combiner responds correctly to BMS commands rather than relying on simple voltage thresholds.\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.12 kg, making it straightforward to install in tight battery compartments or switchboards.\u003c\/li\u003e\n  \u003cli\u003eDesigned to work within Victron's broader ecosystem, integrating with Victron BMS units and compatible third-party BMS outputs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eConventional voltage-sensitive relays connect batteries based on voltage levels alone. In a lithium-ion system, this approach is inadequate: a Li-ion battery can reach a high voltage while still being in a condition where further charging is unsafe. The Cyrix-Li-ct addresses this by taking its switching signal directly from the BMS charge-disconnect or load-disconnect output. When the BMS signals that charging should stop, the Cyrix-Li-ct opens immediately, isolating the Li-ion bank from the alternator or charger regardless of the measured voltage.\u003c\/p\u003e\n\n\u003cp\u003eThe \"ct\" designation indicates the unit is controlled by the BMS rather than operating autonomously on voltage detection. This makes it the correct choice wherever a Li-ion battery is being combined with a conventional lead-acid starter battery, for example in a motorhome, boat or commercial vehicle where the engine alternator charges both banks simultaneously. The 120A rating covers most alternator outputs in these applications without requiring an oversized unit.\u003c\/p\u003e\n\n\u003cp\u003eAt 12V or 24V compatibility, the same unit covers a wide range of system designs without needing separate part numbers for each voltage. Installation requires a BMS with a suitable charge-disconnect or load-disconnect output. The Cyrix-Li-ct is not a standalone voltage-sensing relay and will not function correctly without a controlling BMS signal.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSKU: CYR010120412\u003c\/li\u003e\n  \u003cli\u003eSystem voltage: 12V or 24V\u003c\/li\u003e\n  \u003cli\u003eContinuous current rating: 120A\u003c\/li\u003e\n  \u003cli\u003eControl input: BMS charge-disconnect or load-disconnect signal\u003c\/li\u003e\n  \u003cli\u003eWeight: 0.12 kg\u003c\/li\u003e\n  \u003cli\u003eGTIN: 8719076034339\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMarine installations combining a Li-ion house bank with a lead-acid engine starter battery.\u003c\/li\u003e\n  \u003cli\u003eMotorhomes and campervans with a lithium leisure battery and a vehicle starter battery charged from the same alternator.\u003c\/li\u003e\n  \u003cli\u003eCommercial vehicles requiring controlled split-charging between Li-ion and lead-acid banks.\u003c\/li\u003e\n  \u003cli\u003eOff-grid systems where a Li-ion battery bank is combined with an auxiliary battery and BMS-controlled isolation is required.\u003c\/li\u003e\n  \u003cli\u003eAny 12V or 24V dual-battery system where a BMS must have authority to disconnect the combiner.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eWhat Is Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Cyrix-Li-ct 12\/24V-120A battery combiner unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-Li-ct must be wired to a compatible BMS charge-disconnect or load-disconnect output to function correctly. It will not operate as a standalone voltage-sensing relay. Installation in marine, vehicle and off-grid battery systems should be carried out by a qualified electrician or accredited installer familiar with lithium battery systems. Ensure all cabling is rated for the continuous 120A load and that appropriate fusing is fitted on both battery connections in accordance with wiring regulations. Verify BMS signal compatibility before installation.\u003c\/p\u003e","brand":"Victron Energy","offers":[{"title":"Default Title","offer_id":59863678550350,"sku":"CYR010120412","price":61.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/3698\/8238\/files\/VoltaconSolar_-_CYR010120412_-_Cyrix-Li-ct_12-24V-120A_intelligent_Li-ion_battery_combiner.webp?v=1781183315","url":"https:\/\/voltaconsolar.com\/products\/victron-cyrix-li-ct-12-24v-120a-battery-combiner","provider":"VoltaconSolar","version":"1.0","type":"link"}