Description
xCyrix-Li-ct 12/24V-230A Intelligent Li-ion Battery Combiner
The Victron Cyrix-Li-ct is a microprocessor-controlled battery combiner designed specifically for lithium-ion battery systems operating at 12V or 24V. It replaces a conventional VSR (voltage-sensitive relay) in dual-battery installations where a Li-ion service bank is paired with a starter battery, allowing charge sharing without risking damage to either battery. It is suited to marine, vehicle and off-grid applications where lithium batteries are in use.
Key Features
- Rated at 230A continuous current, suitable for high-demand dual-battery installations.
- Compatible with 12V and 24V systems, covering the most common Li-ion battery configurations.
- Microprocessor-controlled logic replaces a standard VSR, with behaviour specifically tailored to lithium battery charge and discharge profiles.
- Designed to receive a control signal from a Li-ion BMS, allowing the BMS to open the combiner in the event of a fault condition such as over-voltage or over-temperature.
- Compact and lightweight at 0.3 kg, making it straightforward to install in confined spaces such as engine bays or battery compartments.
- Prevents the starter battery from being discharged by the lithium service bank, protecting engine start capability.
Product Overview
The Cyrix-Li-ct operates differently from a standard voltage-sensitive relay. Rather than simply connecting batteries when a threshold voltage is detected, it is designed to work in conjunction with the charge/discharge control outputs of a compatible Li-ion BMS. When the BMS signals that the lithium battery is approaching an unsafe state, the Cyrix-Li-ct opens the connection between the two banks, isolating the lithium battery from the rest of the system. This is a critical safety function that a conventional VSR cannot provide.
The "ct" designation refers to the charge/discharge control terminals on the unit. These terminals accept a signal from the BMS to either allow or interrupt the combining function. In practice, this means the combiner behaves intelligently based on battery state rather than voltage alone, which is essential when working with lithium chemistries that have a much flatter discharge curve than lead-acid batteries.
At 230A, the unit handles the current demands of typical alternator charging and high-load scenarios without derating. The 12/24V compatibility makes it a single stock item for installers working across different system voltages, reducing the need to carry multiple variants.
Specifications
- SKU: CYR010230412
- System voltage: 12V / 24V
- Continuous current rating: 230A
- Control interface: Charge/discharge control terminals (BMS signal input)
- Weight: 0.3 kg
- GTIN: 8719076034346
Applications
- Marine vessels with a lithium service bank and a separate lead-acid or AGM starter battery.
- Campervans, motorhomes and HGVs using lithium leisure batteries alongside a vehicle starter battery.
- Off-grid vehicles and mobile installations where alternator charging feeds a Li-ion battery bank.
- Any dual-battery system where BMS-controlled isolation of the lithium bank is required for safe operation.
What Is Included
- 1 x Victron Cyrix-Li-ct 12/24V-230A battery combiner
Installation Notes
Installation should be carried out by a qualified electrician or experienced marine/vehicle electrical engineer. The Cyrix-Li-ct must be wired to the charge/discharge control output of a compatible Li-ion BMS for the protection functions to operate correctly. Connecting this unit without a BMS control signal will prevent the safety isolation feature from functioning as intended. Ensure all cabling is rated for the 230A continuous load and that appropriate fusing is installed on both battery connections. For marine installations, follow the relevant wiring standards for your vessel class.
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.