SKU: 62617146943

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

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Description

Victron Cyrix-Li-ct Intelligent Li-ion Battery Combiner 12/24V-120AVictron Cyrix Li ct: Intelligent Battery Combiner for LiFePO4 and Lead Acid Systems Seamless Parallel Connection Between Starter and Lithium Batteries The Victron Cyrix Li ct 12 24V 120A 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

Victron Cyrix-Li-ct: Intelligent Battery Combiner for LiFePO4 and Lead Acid Systems

Seamless Parallel Connection Between Starter and Lithium Batteries

The Victron Cyrix-Li-ct 12/24V-120A 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.

Unlike 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.

How the Cyrix-Li-ct Protects Your Lithium Investment

Lithium 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.

Key protective functions include:

  • BMS-controlled engagement: The relay closes only when the VE.Bus BMS Charge Disconnect output is high, ensuring charging only occurs under safe conditions.
  • Immediate disengagement: If the BMS control input becomes free floating (indicating a fault), the Cyrix opens without delay, halting current flow.
  • Undervoltage lockout: The relay disengages when battery voltage drops below 13.2V (12V system) or 26.4V (24V system), preventing deep discharge of the starter battery.
  • Transient voltage suppression: A built-in suppressor limits voltage spikes during sudden disconnection, protecting sensitive electronics.

Start Assist: Emergency Power When You Need It

A standout feature is the start assist function. 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.

Engineered for Demanding Environments

The 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.

An 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.

Typical Applications

  • Caravans and motorhomes: Automatically charge the house lithium battery from the alternator while protecting the starter battery.
  • Marine systems: Combine a lead acid engine battery with a LiFePO4 house bank, with BMS-coordinated safety.
  • Off-grid solar: Integrate with Victron inverter/chargers and MPPT controllers for a fully managed energy system.
  • Commercial vehicles: Maintain auxiliary lithium batteries for lifts, refrigeration, or onboard equipment.

Installation and Compatibility Notes

The 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.

Take Control of Your Dual-Battery System

Upgrade your energy management with the Victron Cyrix-Li-ct 12/24V-120A. 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.

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SKU: 62617146943

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4.7 ★★★★★
Based on 1062 reviews
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Braunschweig
Chelsea, US
★★★★★ 5
This was a favorite fourth grade class book club book during a study of Native Americans.
Format: Paperback
This year my fourth grade class read the book Children of the Longhouse as a book club book. They were divided into groups of 4 and 5, and each day they would prepare a section of the book to read, and discuss it. Then the leader that day of each group shared what they thought. I don't want to spoil the story, but we were examining the relationships that the characters and the community in the book had to nature, and my students loved that. They found it interesting to learn about the beliefs, and that the challenges people had to face and overcome. They loved the climax and the ending too. Characters that they had felt were "bad guys" led to discussions of what options people in another culture might have which would necessitate them doing things that seem bad to us, like disobeying adult advice. I love the way this book fleshes out a pre European existence in the Northeast that helps us picture what life might have been like in an Iroquois village. We love the role that LaCross plays. My students use the Iroquois word for it. I pointed out the glossary at the back with pronunciations for Mohawk words, and my students loved using them and would even discuss how to correctly pronounce them. The book introduced my students to many ideas that they had never been exposed to, and they cared about the characters a lot. They also loved discussing the book more in an in depth way, and then hearing what other groups had had to say. I was interesting how similar the things that each group shared were. We can see that we need to shift our attitudes and be more connected to the natural world all around us.
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Reviewed in the United States on December 17, 2019
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Verified Purchase
David
Houston, US
★★★★★ 5
museum quality
Format: Paperback
This is a kid's book, which is well illustrated, and useful. I have worked as a storyteller in schools. Kids of all backgrounds love native stories! All of Joseph Bruchac's books are high quality, museum pieces, just really good, the apotheosis [ideal] of what a storybook could be like. gives a very good description of the native lifeways around stories, and gives another view of native storytelling. is another book that gives you native context, by an author who also has native storybooks in print, including . Entering into native lifeways is not necessarily judgeable by white man culture, as shows. One thing one notices in native cultures is that they ask new questions, something like one sees in . I find native metaphysics to be similar to Quantum Mechanics. While not a native book, gives some ideas on how life would work, from that perspective. has stories about tricksters, which are not dissimilar to native stories. teachingdrum.org used to have a list of books of native stories, which is the most comprehensive I've seen. That is a nonprofit, and I have no connection with them, this cites the info resource only. All storytelling is fascinating. is one example of European stories about animals, which are not totally dissimilar. Stories are fascinating. If you want to entrance, train, entertain, educate, and improve children, nothing is faster or easier than storytelling.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2012
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Verified Purchase
sswan
Carnegie, US
★★★★★ 4
Great gift for a new teacher
Format: Paperback
Bought this book for a new teacher building up her book collection for her new classroom. It was a hit!
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Reviewed in the United States on December 24, 2021
A
Verified Purchase
Amazon Customer
Natrona Heights, US
★★★★★ 5
Wonderful book for many reasons
Format: Paperback
I recommend this book for its story, cultural accuracy, and high interest action. First it is an exciting story of how conflicts arise and can be resolved with an exciting lacrosse game at the end. How cool is that? But the cultural and historical details make this a fascinating read for all ages. If you want to know about the lives of Native Americans in the New York area, written by a Native American, and put into an historically accurate story, this is a great read. I would recommend this as a high interest type of reader for middle school readers, one that would challenge them as well. The story could be about conflicts today, but the action is naturally more intense. If you are looking for an accurate portrait of Native American life, Bruchac is a wonderful author for you to choose. It is hard to find good books about northeastern Native Americans.
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Reviewed in the United States on October 12, 2013
A
Verified Purchase
Ashley and Jeremey
Louisville, US
★★★★★ 5
Engaging and educational
Format: Paperback
We really enjoyed this book as a family. My children were enthralled with characters and depiction of life in a Longhouse village. We supplemented this book with others about the Iroquois Nation and East Coast Native Americans for our homeschooling unit. It was a hit.
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Reviewed in the United States on December 3, 2023

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