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 when one is being charged and disconnects them when charging stops, protecting the starter or primary battery from discharge. It is suited to marine, vehicle and off-grid installations where two separate battery banks need to be managed without manual intervention.
Key Features
- Rated for 12V and 24V DC systems with a continuous current capacity of 230A.
- Microprocessor-controlled logic connects batteries when voltage rises above a set threshold and disconnects when it falls, preventing unwanted discharge of the starter or house bank.
- Solid-state design with no moving parts, eliminating the mechanical wear associated with traditional solenoid combiners.
- Automatic voltage detection distinguishes between 12V and 24V systems without manual configuration.
- Compact and lightweight at 0.3 kg, suitable for installation in confined spaces on vehicles, boats and off-grid setups.
- Compatible with all charging sources including alternators, solar charge controllers and shore power chargers, as it responds to voltage rather than charge source type.
Product Overview
The Cyrix-ct operates by monitoring battery voltage. When the voltage on either battery bank rises to a level indicating active charging (13.7V on a 12V system or 27.4V on a 24V system), the unit connects the two banks in parallel so both receive charge. When the voltage drops below the disconnect threshold, the banks are separated. This prevents a depleted auxiliary bank from draining the starter battery, which is a common failure point in dual-battery installations.
Unlike diode-based battery isolators, the Cyrix-ct introduces no voltage drop between the alternator and the batteries. This means batteries receive the full charge voltage, which matters particularly for AGM and lithium batteries that require precise charge voltages to reach full capacity. The "ct" designation indicates the unit is intended for use with a common positive terminal arrangement, making it straightforward to wire into most standard dual-battery configurations.
The microprocessor also includes a load detection algorithm. If a large load is switched on and causes a voltage rise that could be mistaken for a charging event, the unit applies a short delay before connecting, reducing the risk of false triggering. This makes it more reliable in real-world installations where voltage fluctuations are common.
Specifications
- SKU: CYR010230010R
- System voltage: 12V / 24V (automatic detection)
- Continuous current rating: 230A
- Weight: 0.3 kg
- GTIN: 8719076022213
Applications
- Dual-battery systems in motorhomes and campervans, keeping the starter battery isolated from the leisure bank.
- Marine installations requiring automatic charge sharing between engine start and house battery banks.
- Off-grid vehicles and 4x4 expedition builds where reliable battery separation is critical.
- Commercial vehicle auxiliary power systems where a secondary battery bank powers equipment without risking the starter battery.
- Solar off-grid systems with a dedicated starter battery alongside a house bank charged by a solar charge controller.
What Is Included
- 1 x Victron Cyrix-ct 12/24V 230A intelligent battery combiner
Installation Notes
The Cyrix-ct should be installed by a competent electrician or qualified auto-electrical engineer familiar with dual-battery systems. Correct fusing of both battery connections is essential before installation. Ensure cable sizing is appropriate for the 230A continuous rating. The unit is not suitable for use with 48V systems. For lithium battery installations, verify that the charge voltage thresholds of the Cyrix-ct are compatible with the battery management system in use before connecting.
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:
- 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.