Description
xVictron Cyrix-ct 12/24V 230A Intelligent Battery Combiner
The Victron Cyrix-ct is a microprocessor-controlled battery combiner designed for 12V and 24V systems carrying up to 230A continuous current. It automatically connects battery banks in parallel when both are being charged, and disconnects them when charging stops, protecting the starter battery from being drained by auxiliary loads. It is well suited to marine, vehicle and off-grid installations where two separate battery banks need to be managed without manual switching.
Key Features
- Microprocessor-controlled logic connects and disconnects battery banks automatically based on voltage thresholds, with no manual intervention required.
- Rated for 230A continuous current at 12V or 24V DC, making it suitable for high-demand auxiliary circuits.
- Protects the starter or primary battery by disconnecting the auxiliary bank when the system voltage drops below the set threshold.
- Compatible with all battery chemistries including lead-acid, AGM, gel and lithium, as the combiner responds to voltage rather than chemistry-specific signals.
- Compact and lightweight at 0.3kg, allowing installation in confined spaces typical of marine and vehicle applications.
- Designed to work alongside alternators, solar chargers and shore power chargers without requiring additional configuration.
Product Overview
The Cyrix-ct operates by monitoring the voltage of both battery banks. When either bank reaches a pre-set charge voltage (indicating an active charging source), the internal relay closes and the banks are connected in parallel, allowing charge current to flow to both. When the voltage drops back below the threshold, the relay opens and the banks are isolated again. This prevents a discharged auxiliary bank from pulling down the starter battery.
The "ct" designation indicates this unit is intended for use between a starter battery and a consumer (auxiliary) battery, making it the standard choice for dual-battery setups in vehicles, motorhomes, boats and similar mobile or off-grid applications. Unlike a simple diode isolator, the Cyrix-ct introduces virtually no voltage drop, meaning both batteries receive the full charge voltage from the alternator or charger. The 230A rating covers the majority of professional installations without requiring an upgrade to a higher-rated unit.
The unit includes a built-in delay on both connect and disconnect to prevent relay chatter during fluctuating charge conditions. It also features an ignition input that can be used to force the relay open when the engine is off, giving additional control over when the banks are combined.
Specifications
- SKU: CYR010230010
- System voltage: 12V or 24V DC
- Continuous current rating: 230A
- Weight: 0.3kg
- GTIN: 8719076022206
Applications
- Dual-battery systems in motorhomes, campervans and caravans where a starter battery must be kept isolated from leisure loads.
- Marine installations requiring automatic combining of engine start and house battery banks.
- Off-grid vehicles and 4x4 expedition builds with high auxiliary current demands.
- Commercial vehicles with refrigeration or tail-lift equipment running from a secondary battery bank.
- Solar-charged auxiliary systems where the combiner allows the alternator to top up the auxiliary bank during driving.
What Is Included
- 1x Victron Cyrix-ct 12/24V 230A intelligent battery combiner
Installation Notes
The Cyrix-ct should be installed by a qualified electrician or auto-electrician familiar with DC battery systems. Connections must be made with appropriately rated cable and correctly sized fusing on each battery connection. The unit is not polarity protected, so correct wiring orientation must be confirmed before energising the system. For marine installations, follow the relevant BMEA or IEC wiring standards. The ignition input wire, if used, must be connected to a switched 12V or 24V supply that is live only when the engine is running.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Non-faulty items returned after 14 days and/or not in their original, undamaged packaging can only be exchanged for store credit - 15% off the items returned.
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.