Victron Energy Cyrix-Li-Ct 12/24V-120A Intelligent LiFePO4 Battery Combiner

Managing multiple LiFePO4 batteries in a 12V or 24V system often leads to uneven charging, premature disconnection, or the need for complex external relays. The Victron Energy CYR010120450 Cyrix-Li-Ct solves this by acting as an intelligent, bidirectional battery combiner that automatically connects or disconnects batteries based on voltage, ensuring safe and efficient parallel operation without voltage drop.

Who is it for

This device is ideal for marine, automotive, and off-grid energy systems where two LiFePO4 batteries need to be combined for charging or load sharing. It is particularly suited for installations using Victron LiFePO4 batteries with integrated BMS, but it also works with other lithium batteries that have a compatible BMS signal.

Main features

• Bidirectional battery combiner: automatically connects two batteries when charging voltage is present and disconnects when voltage drops, preventing reverse current flow.
• Microprocessor-controlled intelligent relay: no voltage drop across the contacts, ensuring maximum efficiency.
• Start Assist function: allows a short peak current of 180 A for 5 seconds to assist engine starting from the auxiliary battery.
• Over-voltage protection: disconnects if voltage exceeds safe limits, protecting sensitive electronics.
• Optimized for LiFePO4 batteries: works seamlessly with Victron LiFePO4 batteries and their BMS, but can also be used with other lithium chemistries via adjustable voltage settings.
• Low power consumption: less than 4 mA when relay is open.

Specifications

• Nominal system voltage: 12V / 24V (auto-detect)
• Continuous current rating: 120 A
• Peak current rating: 180 A (5 seconds)
• Power consumption (relay open): < 4 mA
• Power consumption (relay closed): < 120 mA
• Operating temperature range: -40 to +60 °C
• Protection rating: IP54
• Battery connection type: M6 studs
• Control connection type: 6.3 mm Faston
• Enclosure material: Plastic
• Mounting type: Surface mount
• Relay type: Microprocessor-controlled intelligent relay
• Disconnect voltage (12V system): 13.2V (adjustable)
• Connect voltage (12V system): 13.8V (adjustable)

Tips

For optimal performance, mount the Cyrix-Li-Ct close to the batteries with short, thick cables to minimize voltage drop. Ensure the BMS signal wire is properly connected if using non-Victron lithium batteries. The adjustable voltage settings allow fine-tuning for specific battery chemistries; refer to the manual for detailed instructions.