Victron Cyrix-i Intelligent Battery Combiner 12/24V-400A
SKU: 33978921667

Victron Cyrix-i Intelligent Battery Combiner 12/24V-400A

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Description

Victron Cyrix-i Intelligent Battery Combiner 12/24V-400AVictron Cyrix i 12 24V 400A: Intelligent Battery Combiner for Dual Battery Systems Advanced Voltage Sensing and Smart Switching for Reliable Parallel Charging The Victron Cyrix i 12 24V 400A is a microprocessor controlled intelligent battery combiner designed to manage dual battery systems in vehicles, boats, and off grid installations. Unlike conventional voltage sensitive relays (VSRs) that rely on simple voltage thresholds and fixed timers, the

Victron Cyrix-i 12/24V-400A: Intelligent Battery Combiner for Dual-Battery Systems

Advanced Voltage Sensing and Smart Switching for Reliable Parallel Charging

The Victron Cyrix-i 12/24V-400A is a microprocessor-controlled intelligent battery combiner designed to manage dual-battery systems in vehicles, boats, and off-grid installations. Unlike conventional voltage-sensitive relays (VSRs) that rely on simple voltage thresholds and fixed timers, the Cyrix-i analyses voltage trends to prevent nuisance switching caused by momentary loads or deeply discharged batteries. This ensures your auxiliary battery charges reliably without unnecessary cycling, extending the lifespan of your entire system.

With a continuous current rating of 400 A and a peak capacity of 2000 A, this combiner handles high-demand applications such as winching, bow thrusters, or large inverter loads. The auto-ranging input (8-36 VDC) automatically detects 12V or 24V systems, simplifying installation and reducing inventory complexity for installers.

Why Trend-Based Switching Matters

Standard battery combiners often disconnect under short, high-current loads or fail to engage a depleted battery bank because the voltage collapses below the disconnect threshold. The Cyrix-i overcomes these limitations by evaluating the voltage trend over time. It only reverses a connection if the trend direction changes for a sustained period, preventing false triggers and ensuring stable parallel operation. Four selectable timing profiles allow customisation for different battery chemistries and usage patterns.

Zero Voltage Drop for Maximum Efficiency

Diode-based isolators introduce a forward voltage drop (typically 0.6-0.7 V), requiring higher alternator or charger output voltages and wasting energy as heat. The Cyrix-i uses high-current relay contacts, resulting in virtually no voltage loss. This means your batteries receive the full charging voltage, improving charge efficiency and reducing strain on your alternator or charger.

Bidirectional Sensing and Dual Power Supply

The Cyrix-i monitors voltage on both connected batteries and can be powered from either side. If one battery is too low to operate the relay, the other battery provides the necessary power. This ensures the combiner engages even when the starter battery is deeply discharged, as long as the auxiliary battery has sufficient voltage. For safety, the unit will not close if either terminal voltage is below 2 V (12V), 4 V (24V), or 8 V (48V), preventing unexpected operation during installation or maintenance.

Emergency Parallel Start Feature

A built-in push-button or remote switch input allows manual parallel connection for 30 seconds, providing an emergency start assist if the starter battery is flat. This feature is invaluable for marine, RV, and off-road applications where a failed start could leave you stranded.

Key Features

  • 400 A continuous / 2000 A peak current rating for high-demand loads
  • Intelligent trend-based switching prevents nuisance disconnects and ensures reliable charging
  • Auto-ranging 12/24V detection simplifies installation and reduces setup errors
  • Virtually zero voltage drop compared to diode isolators, maximising charge efficiency
  • Bidirectional voltage sensing and dual power supply for robust operation
  • Emergency start assist via push-button or remote switch for peace of mind
  • Microswitch output for remote status monitoring
  • Compact, vibration-resistant design with durable metal mounting bracket

Built for Demanding Environments

Encased in a rugged housing with high-current copper terminals, the Cyrix-i is engineered for the harsh conditions of engine rooms, vehicle chassis, and marine installations. The bicolour LED provides at-a-glance status indication, while the microswitch terminals enable integration with remote monitoring systems. Weighing just 0.9 kg, it adds minimal weight while delivering industrial-grade reliability.

Applications

Ideal for dual-battery systems in 4WDs, caravans, motorhomes, boats, and commercial vehicles. Use it to combine a starter battery with an auxiliary deep-cycle battery, or to link multiple battery banks for charging from a single alternator or charger. The Cyrix-i is also suitable for 24V systems in trucks, buses, and heavy equipment.

Upgrade Your Battery Management Today

Replace unreliable diode isolators or basic VSRs with the Victron Cyrix-i Intelligent Battery Combiner and experience smarter, more efficient parallel charging. Order now to ensure your dual-battery system delivers dependable power when you need it most.

Shipping Notes
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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]
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SKU: 33978921667

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Kat
West Palm Beach, US
★★★★★ 5
a quiet life???
This is a short story collection like Sir Arthur Conan Doyle and Agatha Christie have for Holmes and Poirot/Marple. The characters remind me of the Phryne Fisher books. There are four stories in Book 1 A Quiet Life in the Country Lady Emily Hartcastle and her maid Miss Florence Armstrong are enjoying some time in the country in the small town of Littleton Cotterell when they come across a dead body. They find out that it is Frank Pickering, a local man and it is thought that he committed suicide. But investigating, it seems that he has been murdered. Who did it and why? The Circus comes to town Lady Hartcastle meets an old friend George who is the manager who for a circus that has come to town. The next day, the juggler Hubert 'Huey' Parving is found dead mawled in a cage and then others began to die. Who is behind this? The Case of the Missing Case Lady Hartcastle and Flo go to the engagement party of young Clarissa Farley-Strouds. The next day, Nelson Holloway, the trumpet player with that night's entertainment - Roland Richman's Ragtime Revue. Who killed him? As they investigate, the clues lead them to possible cursed stolen jewel. The Half-Death of Gunther Ehrlichmann Florence recounts her life before and after meeting Lady and Lord Hartcastle as she and Lady Hartcastle along with Lady Hartcastle's brother hunt down a killer. Each story is tied into the other, but exciting! Must read!
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Reviewed in the United States on May 20, 2016
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Cynthia D. Vosler
Houston, US
★★★★★ 5
Great read!
Format: Kindle
Absolutely enjoyable read. Great characters, can't wait for their next adventure! If you like enjoyable fast reads a good mystery and some delightful laughs this series is for you!
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Reviewed in the United States on April 12, 2026
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Sophia Rose
Charlottesville, US
★★★★★ 4
Fun Seeing Where it All Begins for the Fantastic Amateur Detecting Duo
Format: Audiobook
I started with book three in this series, progressed forward, and finally took the opportunity to go back and get the first book in the series. The whimsical, cozy mystery paired with historical Edwardian setting was light and whimsical. Actually, when I started listening, I realized that the first book introduced Lady Hardcastle and her ladies' maid, Florence Armstrong along with their new home and the other regular characters, in such a way that it didn't feel like the first book so much as the first of the stories that had been recorded. There are hints of their unusual, dangerous work abroad and no big explanation why the pair happened to be set upon 'a quiet life in the country' or why Lady Hardcastle and Florence have a relationship that is nearly family rather than an employer and servant from separate classes. The author trickles out the details and the reader/listener must catch them and piece them together as they go. Because I had experienced later books, those pieces stuck out easily to me. The meeting with Inspector Sunderland and the local villagers and neighborhood was fun. There are two murder mysteries that have interesting crossover people and facts. One seems to involve a dead man from the village cricket team whose death was meant to appear like a suicide and then later, the death of a rag-time band trumpeteer that played at the engagement party of the local squire's daughter. A theft is tossed in for good measure. I figured out one of the murders and part of the theft and the second murder, but the ultimate solution took me by surprise. Loved seeing the intrepid Flo able to get in some of her martial arts ability and spend time trailing along as they teased out the solution along side Inspector Sunderland. Elizabeth Knowelden is an absolute gem of a narrator and the voice of this series for me. She laid out the Edwardian country village world, the variety of genders and accents, and kept the pace and tone for this series just right. All in all, I thought this first entry was as fabulous as the later books and do not hesitate to put it out there as a good bet for historical cozy mystery lovers.
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Reviewed in the United States on March 22, 2019
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Leond
Los Angeles, US
★★★★★ 5
Must read!!!!
Format: Paperback, Format: Paperback
Surprise plot intertwined with story of loss, grief, family and sibling relationships. The book starts off normally and twists and turns. Could not put book down. Great writing and plot development. Can’t wait to read more by this author.
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Reviewed in the United States on May 25, 2026
J
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Josh Mauthe
Bozeman, US
★★★★★ 4
A story about what's left behind after death, both emotionally & spiritually - oh, and evil puppets
Format: Kindle
It takes a bit for Grady Hendrix's How to Sell a Haunted House to get to the "haunted" part of that title, but that's okay, really; what Hendrix is interested in here, as much as anything, is haunting in terms of the literal things left behind by death - the traumas that are left for those who survive, the guilt, the shame, the baggage, and all of the other things left behind by those who went before us. And, in the case of Louise and Mark Joyner, puppets. Lots and lots and lots of puppets. Oh, and one of them might be alive and malevolent, turning all of that metaphorical trauma into a very real presence (and, without getting into spoiler territory, all without losing that symbolic weight) - and one that allows Hendrix to bring real horror into the story of an estranged pair of siblings forced back into contact in the weight of their parents' death, and the reckoning that they have to go through as they deal with painful memories and a nightmare puppet. The end result can feel a little cluttered at times (although, by the end, it turns out to be a lot more interconnected and structured than you might realize along the way), and it doesn't help that it features some very fraught family interactions that cross from "painful" to "infuriating" very quickly. But as ever with Hendrix, there's more heart and emotion here than you might expect, and while it's all handled in his usual slightly off-kilter and unique sensibility, it still knows how to deliver the goods both on a horror front and a character one. I'd put it among the weakest of Hendrix's efforts overall, but there's a caveat here, and it's that I don't think anything he's read has ever been anything less than entertaining and solid overall, so even a weaker entry? Still a good time and a good read.
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Reviewed in the United States on October 8, 2023

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