{"product_id":"victron-cyrix-ct-12-24v-120a-battery-combiner-r","title":"Victron Cyrix-ct 12\/24V-120A Battery Combiner Kit Retail - CYR010120110R","description":"\u003ch1 style=\"color: #f87c24;\"\u003eVictron Cyrix-ct 12\/24V 120A Battery Combiner Kit\u003c\/h1\u003e\n\n\u003cp\u003eThe Victron Cyrix-ct is a microprocessor-controlled battery combiner designed for 12V and 24V dual-battery systems. It automatically connects batteries in parallel when one is being charged, and disconnects them when charging stops, protecting the secondary battery from discharge. Suited to marine, motorhome, vehicle and off-grid installations where a starter battery must be kept isolated from a service or leisure battery.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMicroprocessor-controlled relay combines batteries when charge voltage is detected, and separates them when it drops, preventing unwanted discharge of the starter battery.\u003c\/li\u003e\n  \u003cli\u003eRated at 120A continuous current, suitable for high-demand dual-battery setups at 12V or 24V.\u003c\/li\u003e\n  \u003cli\u003eAutomatic voltage detection: compatible with both 12V and 24V systems without manual configuration.\u003c\/li\u003e\n  \u003cli\u003eIgnition input terminal allows the combiner to be activated directly when the engine is running, giving additional control over when batteries are joined.\u003c\/li\u003e\n  \u003cli\u003eRetail kit format includes the Cyrix-ct unit and all necessary hardware for a complete installation.\u003c\/li\u003e\n  \u003cli\u003eCompact and solid-state relay design with no moving parts subject to wear, reducing long-term maintenance requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Cyrix-ct works by monitoring the voltage across the battery banks. When the alternator or charger raises the voltage above the combine threshold (indicating active charging), the unit closes its internal relay and connects the two battery banks in parallel. Both banks then charge simultaneously. When the voltage falls below the disconnect threshold, the relay opens and the banks are isolated again. This prevents a deeply discharged service battery from pulling down a starter battery.\u003c\/p\u003e\n\n\u003cp\u003eThe \"ct\" designation refers to the ignition input feature. Connecting the ignition terminal to a switched 12V or 24V supply means the Cyrix-ct will also combine the batteries whenever the engine is running, regardless of alternator output voltage. This is particularly useful in vehicles where the alternator voltage rise is slow or where split-charge behaviour needs to be predictable from engine start. The microprocessor logic includes time delays to prevent nuisance switching during voltage fluctuations.\u003c\/p\u003e\n\n\u003cp\u003eAt 120A, the unit handles the current demands of most leisure vehicle and small marine installations. It is not a diode-based isolator, so there is no voltage drop across the combiner when it is closed, meaning both batteries receive the full charge voltage from the alternator or charger.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSKU: CYR010120110R\u003c\/li\u003e\n  \u003cli\u003eSystem voltage: 12V and 24V (automatic detection)\u003c\/li\u003e\n  \u003cli\u003eContinuous current rating: 120A\u003c\/li\u003e\n  \u003cli\u003eIgnition input: Yes (ct variant)\u003c\/li\u003e\n  \u003cli\u003eFormat: Retail kit\u003c\/li\u003e\n  \u003cli\u003eWeight: 0.9 kg\u003c\/li\u003e\n  \u003cli\u003eGTIN: 8719076022169\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMotorhomes and campervans with a starter battery and separate leisure battery bank.\u003c\/li\u003e\n  \u003cli\u003eMarine vessels requiring isolation between engine start battery and domestic battery bank.\u003c\/li\u003e\n  \u003cli\u003eCommercial vehicles with auxiliary power requirements (refrigeration, tail lifts, lighting).\u003c\/li\u003e\n  \u003cli\u003eOff-grid vehicles and expedition builds where battery management must be automatic and reliable.\u003c\/li\u003e\n  \u003cli\u003eAny dual-battery 12V or 24V installation where diode-based isolators are unsuitable due to voltage drop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #f87c24;\"\u003eWhat Is Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eVictron Cyrix-ct 12\/24V 120A battery combiner unit\u003c\/li\u003e\n  \u003cli\u003eMounting hardware and installation accessories (retail kit)\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 systems. Correct cable sizing and fusing at each battery terminal is essential given the 120A rating. The ignition input wire must be connected to a switched live that is only active when the engine is running. Ensure the unit is mounted in a dry, ventilated location away from fuel lines and direct heat sources. For marine installations, follow BMEA or equivalent wiring standards.\u003c\/p\u003e","brand":"Victron Energy","offers":[{"title":"Default Title","offer_id":59863680418126,"sku":"CYR010120110R","price":79.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/3698\/8238\/files\/VoltaconSolar_-_CYR010120110R_-_Cyrix-ct_12-24V-120A_Battery_Combiner_Kit_Retail.webp?v=1781183349","url":"https:\/\/voltaconsolar.com\/products\/victron-cyrix-ct-12-24v-120a-battery-combiner-r","provider":"VoltaconSolar","version":"1.0","type":"link"}