SKU: 60234287954

Victron Cyrix-ct Intelligent Battery Combiner 12/24V-120A VSR

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Description

Victron Cyrix-ct Intelligent Battery Combiner 12/24V-120A VSRVictron Cyrix ct 120A Intelligent Battery Combiner for Dual Battery Systems Advanced Voltage Sensing Relay with Trend Detection for Reliable Parallel Charging The Victron Cyrix ct 12 24V 120A is a microprocessor controlled intelligent battery combiner that functions as a bidirectional voltage sensitive relay (VSR). Unlike conventional split charge relays that rely on simple voltage thresholds and fixed time delays, the Cyrix ct analyses the overall

Victron Cyrix-ct 120A Intelligent Battery Combiner for Dual Battery Systems

Advanced Voltage Sensing Relay with Trend Detection for Reliable Parallel Charging

The Victron Cyrix-ct 12/24V-120A is a microprocessor-controlled intelligent battery combiner that functions as a bidirectional voltage sensitive relay (VSR). Unlike conventional split charge relays that rely on simple voltage thresholds and fixed time delays, the Cyrix-ct analyses the overall voltage trend to prevent nuisance switching. This ensures your auxiliary battery bank charges reliably from the alternator or mains charger without premature disconnection under heavy loads or reconnection when surface charge dissipates.

Engineered for 12V and 24V automotive and marine electrical systems, the Cyrix-ct auto-detects system voltage and provides a continuous current rating of 120 A, making it suitable for charging large domestic battery banks, bow thruster batteries, and other onboard equipment. Its bidirectional sensing allows the combiner to engage when either battery reaches the connect voltage, so charging sources on either side can parallel the banks automatically.

Intelligent Trend Detection Eliminates Unwanted Cycling

Standard voltage-controlled relays often disconnect a battery when a short, high-current load causes a momentary voltage dip, or fail to connect a deeply discharged bank because the voltage collapses below the disconnect threshold immediately after engagement. The Cyrix-ct’s software monitors the rate and direction of voltage change over time, reversing a previous action only if the trend has genuinely reversed. The time delay adapts based on the deviation from the trend, providing stable operation in demanding conditions.

Key Features

  • 120 A continuous current rating with 180 A cranking assist for emergency parallel starts
  • 12/24 V auto-ranging detects system voltage automatically, no manual configuration needed
  • Bidirectional voltage sensing and dual power supply allows engagement from either battery, even if one is deeply discharged
  • Start Assist function via push button or switch provides 30-second emergency parallel connection
  • Over-temperature protection disengages the relay if contact temperature becomes excessive, re-engaging after cooling
  • Virtually zero voltage drop across the contacts, eliminating the need to increase alternator or charger output voltage
  • Prioritises starter battery by connecting auxiliary banks only after the starter reaches the connect voltage
  • Compact IP54-rated housing (46 x 46 x 80 mm) withstands dust and water spray in engine bays and marine compartments
  • Low power consumption: less than 4 mA when open, 220 mA (12 V) or 120 mA (24 V) when closed
  • 13 mm (M6) long stud terminals allow secure connection of multiple heavy-duty cable lugs

Reliable Parallel Charging Without Voltage Loss

Diode-based battery isolators introduce a voltage drop of 0.6–0.7 V, which can prevent full charging unless the alternator or charger is voltage-boosted. The Cyrix-ct uses a high-current relay with negligible contact resistance, so your batteries receive the full charging voltage. This makes it a direct, efficient replacement for diode isolators in 12V dual battery systems and 24V marine setups.

Emergency Start Assist for Peace of Mind

If your starter battery becomes discharged or damaged, the Cyrix-ct can be manually engaged using a momentary push button or switch connected to the Start Assist terminal. The relay remains closed for 30 seconds, allowing you to draw power from the auxiliary bank to crank the engine. This feature is invaluable for remote travel, off-grid work sites, and marine applications where a flat starter battery could leave you stranded.

Designed for Harsh Environments

With an operating temperature range of -40 to +60 °C and an IP54 protection rating, the Cyrix-ct is built to perform in engine compartments, bilges, and exposed vehicle installations. The fully sealed housing resists dust ingress and water spray, while the robust M6 stud terminals accept heavy-gauge cable lugs for secure, low-resistance connections.

Typical Applications

  • Charging a second battery in 4WD, caravan, and camper trailer dual battery systems
  • Marine installations with separate start and house battery banks
  • Bow thruster and windlass battery charging
  • Commercial vehicles and agricultural machinery with auxiliary power requirements
  • Off-grid solar systems where multiple battery banks need to be combined during charging

Installation and Wiring

The Cyrix-ct features clearly labelled M6 stud terminals for Battery 1 (Terminal 87) and Battery 2 (Terminal 30), plus spade terminals for the negative sensing wire (Terminal 86) and optional Start Assist switch (Terminal 85). A wiring diagram is included in the product images to guide installation. For systems requiring multiple engage/disengage profiles, consider the Victron Cyrix-i 400.

Upgrade Your Dual Battery System with Intelligent Control

Replace unreliable diode isolators and basic voltage-sensing relays with the Victron Cyrix-ct 120A Intelligent Battery Combiner. Its trend-detection logic, bidirectional sensing, and emergency start assist provide dependable parallel charging for your auxiliary batteries. Order today to ensure your onboard power system operates efficiently and reliably, wherever your journey takes you.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 60234287954

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Patricia G.
Boise, US
★★★★★ 5
Attractive, easy to install, nicely equipped hardware package.
Color: B. Rustic Brown - Americana Farmhouse Style, Number Of Shelves: 2, Size: 22.5inches
These are pretty doggone nice shelves and I appreciate the fact that they are not made of solid particle board. Yes they are made of an engineered product, but they are lightweight and strong…and look better than particle board products and more costly than their actual price. Easy installation system with the bracket…not fussy like some are. An especially thoughtful touch is the variety of hardware that is included. Also a tiny level for use when installing them. What? …So they can be installed correctly? I was pleasantly surprised by this inclusion.
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Reviewed in the United States on May 29, 2026
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Sara
Carnegie, US
★★★★★ 5
Beautiful shelves
Color: B. Rustic Brown - Americana Farmhouse Style, Number Of Shelves: 2, Size: 22.5inches
Great quality shelves, have them in 4 rooms, they are easy to hang up and lightweight, look really nice and keeps room looking organized and clean.
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Reviewed in the United States on May 24, 2026
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Kristal S.
Chelsea, US
★★★★★ 5
Perfect for a coffee bar
Color: B. Rustic Brown - Americana Farmhouse Style, Number Of Shelves: 3, Size: 15.7inches, Color: B. Rustic Brown - Americana Farmhouse Style, Number Of Shelves: 3, Size: 15.7inches
These are great for my coffee bar! These shelves are easy to install and came with all the hardware needed. What a great value for your money, especially when you get 3 of these cute shelves. I love how they help organize my coffee bar area and the size fits perfectly.
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Reviewed in the United States on May 26, 2026
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Saved
Lowell, US
★★★★★ 4
If the set screws were white the shelves would be perfect.
Color: C. White - Modern Minimalist Style, Number Of Shelves: 3, Size: 15.7inches
I'd give 4 1/2 if there was one. The shelves thwmself are nice I just don't like the visible little black set screws. The shelves themself look great and are not wobbly at all if you install correctly. I purposely installed the bracket upside down because of the little black setting screws; I didnt want them showing because the shelves are above eye level and the screws are black and I didn't want them showing. But that made the shelf lean amd wobbly so I turned them back over the way they are supposed to be and that made them level and sturdy. I guess I'll paint the little screws.
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Reviewed in the United States on January 21, 2026
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Miah
Los Angeles, US
★★★★★ 5
Solid Floating Shelves 🛠️🏠
Color: Black, Number Of Shelves: 4, Size: 15.7in
I have installed four sets of the black floating shelves in my office. They are made of high quality materials, featuring a sophisticated black woodgrain finish with a natural texture. Supposedly, each unit can handle up to 22 pounds, though I would not recommend testing that limit with your vintage bowling ball collection if you value your flooring. They are awesome. The value is good for a set of two. Each shelf measures 22x7x1 (56x17x3 cm) inches, providing a decent amount of storage for books or decor. The installation was straightforward since the hardware for multiple wall types was included. They work well in the kitchen for spices or in the bedroom for personal belongings. One tip for a secure fit: use a level during installation and make sure the bracket is flush against the wall before sliding the shelf on, or your photos might look like they are sliding off a mountain 📐 These shelves offer a clean, modern look and stay stable once mounted correctly. They are a practical choice for adding functional display space to any room 🖼️
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Reviewed in the United States on May 4, 2026

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