Description
xVictron Cyrix-Li-Charge 24/48V 120A Intelligent Charge Relay
The Cyrix-Li-Charge is a microprocessor-controlled charge relay designed to combine a lithium battery bank with a secondary battery or charging source in 24V and 48V systems. It is aimed at professional installers working on off-grid, marine, and vehicle power systems where lithium and lead-acid batteries need to be managed separately but charged from a common source.
Key Features
- Rated at 120A continuous current, suitable for 24V and 48V battery systems.
- Microprocessor-controlled logic monitors battery voltage and connects or disconnects the charge circuit automatically.
- Designed specifically for lithium battery chemistries, preventing incorrect charge sharing that could damage Li cells.
- Allows a lithium battery to be charged from an alternator, solar charger or other source via a secondary lead-acid or lithium starter battery.
- Compact and lightweight at 0.12 kg, making it straightforward to install in confined spaces.
- Compatible with Victron's broader battery management ecosystem, including BMV monitors and BMS units.
Product Overview
The Cyrix-Li-Charge operates by monitoring the voltage of the starter or secondary battery. When that battery reaches a threshold indicating active charging, the relay closes and allows current to flow into the lithium bank. When charging stops and voltage drops, the relay opens again, isolating the two banks. This prevents the lithium battery from discharging back into the starter battery or alternator circuit.
The 24/48V rating makes this unit suitable for larger off-grid and commercial vehicle installations where 12V is insufficient. At 120A, it handles substantial charge currents without requiring an oversized relay or external controller. The microprocessor logic removes the need for manual switching and reduces the risk of incorrect operation in unattended systems.
This relay is intended for use alongside a dedicated lithium BMS. It does not replace BMS protection functions. Installers should ensure the BMS retains full control over cell-level protection, with the Cyrix-Li-Charge handling only the charge-source combining function.
Technical Specifications
| Specification | Value |
| SKU | CYR020120430 |
| Voltage | 24V / 48V |
| Continuous Current Rating | 120A |
| Battery Chemistry | Lithium (Li-ion / LiFePO4) |
| Control Type | Microprocessor-controlled |
| Weight | 0.12 kg |
| GTIN | 8719076022268 |
Applications
- Off-grid solar systems using a 24V or 48V lithium battery bank with a secondary lead-acid starter battery.
- Marine installations where alternator output needs to charge a lithium house bank without direct alternator-to-lithium connection.
- Commercial vehicles and motorhomes with split 24V or 48V battery systems.
- Hybrid battery setups where lithium and lead-acid banks must be isolated during discharge but combined during charging.
What Is Included
- 1x Victron Cyrix-Li-Charge 24/48V 120A intelligent charge relay
Installation Notes
Installation should be carried out by a qualified electrician or accredited installer familiar with lithium battery systems. The Cyrix-Li-Charge must be used in conjunction with a compatible lithium BMS; it does not provide cell-level protection independently. Ensure correct polarity and that all cabling is rated for the full 120A continuous load. For marine installations, follow applicable NMEA and flag-state wiring standards. Do not install in sealed, unventilated enclosures without confirming thermal ratings are met.
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.