{"product_id":"victron-cyrix-ct-12-24v-120a-battery-combiner","title":"Victron Cyrix-ct 12\/24V-120A intelligent battery combiner - CYR010120011","description":"\u003ch1 style=\"color: #f87c24;\"\u003eVictron Cyrix-ct 12\/24V 120A Intelligent Battery Combiner\u003c\/h1\u003e\n\n\u003cp\u003eThe Victron Cyrix-ct is a microprocessor-controlled battery combiner designed for 12V and 24V systems carrying up to 120A continuous current. It automatically connects batteries in parallel when one battery is being charged, then disconnects them when charging stops, protecting the starter or primary battery from being drained by auxiliary loads. It is suited to marine, vehicle and off-grid installations where two battery banks need to be managed without manual switching.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMicroprocessor-controlled logic connects and disconnects battery banks automatically based on voltage thresholds, with no manual intervention required.\u003c\/li\u003e\n  \u003cli\u003eRated for 120A continuous current on 12V or 24V DC systems, making it suitable for high-demand auxiliary loads.\u003c\/li\u003e\n  \u003cli\u003eConnects batteries in parallel when the system voltage rises to a charge level, and disconnects when voltage drops back to a resting level, preventing cross-discharge.\u003c\/li\u003e\n  \u003cli\u003eCompact and lightweight at 0.12 kg, allowing installation in tight spaces such as engine bays, caravans and boat bilge areas.\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard lead-acid, AGM and gel battery chemistries commonly used in dual-battery systems.\u003c\/li\u003e\n  \u003cli\u003eSolid-state design with no moving parts, reducing the risk of mechanical failure in vibration-prone environments.\u003c\/li\u003e\n  \u003cli\u003eSKU: CYR010120011 | GTIN: 8719076022138\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-ct operates by monitoring the voltage of both battery banks. When the voltage on either bank rises above the connect threshold (indicating a charge source is active), the unit closes its internal relay to join the banks in parallel. Both batteries then charge simultaneously from the available source, whether that is an alternator, shore power charger or solar charge controller. When the charge source is removed and voltage falls back below the disconnect threshold, the relay opens and the banks are isolated again.\u003c\/p\u003e\n\n\u003cp\u003eThis behaviour protects the starter battery in vehicle and marine applications. If the auxiliary bank is heavily discharged, it cannot pull down the starter battery because the combiner only connects the banks during active charging. The voltage thresholds are pre-set by Victron and are appropriate for standard lead-acid chemistry. The \"ct\" designation indicates this unit is intended for use with conventional alternators and battery chargers, as opposed to the Cyrix-Li variants designed for lithium battery systems.\u003c\/p\u003e\n\n\u003cp\u003eThe unit requires a connection to an ignition or charge-detect signal in some installation configurations, allowing it to respond correctly when an alternator is the charge source. Wiring is straightforward, with clearly labelled terminals for both battery banks and the control input.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSKU: CYR010120011\u003c\/li\u003e\n  \u003cli\u003eSystem voltage: 12V or 24V DC\u003c\/li\u003e\n  \u003cli\u003eContinuous current rating: 120A\u003c\/li\u003e\n  \u003cli\u003eWeight: 0.12 kg\u003c\/li\u003e\n  \u003cli\u003eGTIN: 8719076022138\u003c\/li\u003e\n  \u003cli\u003eCompatible battery chemistries: Lead-acid, AGM, Gel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDual-battery systems in motorhomes and campervans, keeping the starter battery isolated from leisure loads.\u003c\/li\u003e\n  \u003cli\u003eMarine installations where a dedicated engine-start battery must be protected from auxiliary drain.\u003c\/li\u003e\n  \u003cli\u003eAgricultural and commercial vehicles with high auxiliary electrical loads running from a secondary battery bank.\u003c\/li\u003e\n  \u003cli\u003eOff-grid cabins or small solar installations using two battery banks that need automatic parallel charging.\u003c\/li\u003e\n  \u003cli\u003e4x4 and overland vehicles with auxiliary battery setups for winches, lighting or refrigeration.\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 Victron Cyrix-ct 12\/24V 120A intelligent battery combiner\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eInstallation should be carried out by a qualified auto-electrician or marine electrician familiar with dual-battery wiring. Ensure the cable sizing to and from the unit is rated for at least 120A and that appropriate fusing is fitted on both battery connections as close to each battery terminal as practical. The Cyrix-ct is designed for lead-acid, AGM and gel battery systems only. Do not use this unit with lithium (LiFePO4) battery banks without first confirming compatibility, as lithium systems have different voltage profiles that may require a Cyrix-Li variant instead.\u003c\/p\u003e","brand":"Victron Energy","offers":[{"title":"Default Title","offer_id":59855247933774,"sku":"CYR010120011","price":39.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/3698\/8238\/files\/VoltaconSolar_-_CYR010120011_-_Cyrix-ct_12-24V-120A_intelligent_battery_combiner.webp?v=1781091827","url":"https:\/\/voltaconsolar.com\/products\/victron-cyrix-ct-12-24v-120a-battery-combiner","provider":"VoltaconSolar","version":"1.0","type":"link"}