Victron Cyrix-i Intelligent Battery Combiner 12/24V-400A
SKU: 80585654692

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

Sale price$172.23 Regular price$191.37
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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
  • 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: 80585654692

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Howard
Boise, US
★★★★★ 5
Great quality tux for the price
Color: White, Size: XX-Large, Color: White, Size: XX-Large
I was pleasantly surprised with the quality and fit right out of the package. The cloth has a subtle pattern that gives it an upscale look without being flashy, and overall it feels far nicer than I expected at this price. Jacket: The jacket has a good weight and thickness, so it feels solid and well-made. Sleeve length was perfect right out of the box, which almost never happens for me. The only fit issue was a bit of snugness in the chest and underarm area, but I have broad shoulders and a larger chest, so that’s not unusual. My dress shirt sleeve length is 36.5", so I went with an XXL instead of my usual XL to make sure the sleeves were long enough. That was the right call, because it’s always easier for a tailor to size something down than to try and make something too small work. Aside from a quick tweak in the chest, this could easily be worn straight out of the package. Pants: The pants are noticeably thinner than the jacket and you can kind of see through them, so you’ll want to be mindful when choosing undergarments. That said, the lighter fabric is actually a plus for summer outdoor events or warm indoor venues since it will help keep you cool and comfortable. The flexible waistband made them very comfortable, and the fit in both the waist and length was spot on. For reference, I usually wear 38x32 dress pants and these matched perfectly. Overall: The quality is excellent for the cost. Even with a minor tailoring bill, my total cost to own this tux will still be less than renting one for a single event. I couldn’t be happier with the purchase and wouldn’t hesitate to pick up another.
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Reviewed in the United States on August 13, 2025
B
blackbutte
West Palm Beach, US
★★★★★ 5
brings me to today’s formal fashion
Color: Brown, Size: X-Large
the peak lapel made me feel sharp for the big family dinner. the slim fit worried me, but it was surprisingly comfy, not too tight on my retired belly. the pockets are deep, which is great for my reading glasses case. didn't need much ironing, just hung it up. a solid, non-fussy suit for us old guys.
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Reviewed in the United States on October 26, 2025
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Customer Review
Houston, US
★★★★★ 4
Works for Dress-Up, Not for Formal Events
Color: Brown, Size: Medium, Color: Brown, Size: Medium
This brown tuxedo is about what you’d expect for under $100 on Amazon. The fabric has a pretty brocade pattern but it’s very thin and floppy. The jacket is lined, which helps give it some structure and makes it look a lot nicer, but the pants don’t lay well since they’re unlined and lack structure. The brown color is actually really nice—rich without looking too chocolately, almost leaning burgundy. That said, the fit on both the jacket and pants is surprisingly good. Overall, this is a fun tux for a costume party or one-off dress-up event, but not something you’d want to rely on for a wedding or a truly formal occasion. Just keep your expectations aligned with the price.
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Reviewed in the United States on September 14, 2025
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Benji Gulf Coast
Lake Worth, US
★★★★★ 5
A true beauty
Color: Red, Size: Large
This tuxedo set is so beautiful. The red is extremely striking and is sure to grab everyone's attention. I ordered a size L, as I am on the cusp of Medium and Large. The pants fit very well, and they have some adjustment points around the waist in case they need to be let out a little more. Also, in the waist band is some elastic portions, which make finding the perfect fit something you won't have to think much about.--- they will stretch with you. The jacket feels like it is custom fitted by a tailor. The quality of this tuxedo, considering the price point, is exceptional.
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Reviewed in the United States on September 6, 2025
M
Michael Woods
Phoenix, US
★★★★★ 5
Its great
Color: White, Size: Large
Got it for my brother and he digs it. Says its comfortable and not too confining. It looks great. Definitely worth the money.
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Reviewed in the United States on September 20, 2025

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