Victron Cyrix-Li-Intelligent Load Relay 24/48V-120A

Victron Cyrix-Li-Intelligent Load Relay 24/48V-120AVictron Cyrix Li load 24 48V 120A: Intelligent Load Disconnect for LiFePO4 Battery Systems Precision Load Control for Lithium Battery Protection The Victron Cyrix Li load 24 48V 120A is a specialised intelligent relay engineered to safeguard LiFePO4 batteries by automatically disconnecting loads when critical thresholds are reached. Designed to integrate seamlessly with the VE. Bus BMS, it provides a reliable second line of defence against cell under

Victron Cyrix-Li-load 24/48V-120A: Intelligent Load Disconnect for LiFePO4 Battery Systems

Precision Load Control for Lithium Battery Protection

The Victron Cyrix-Li-load 24/48V-120A is a specialised intelligent relay engineered to safeguard LiFePO4 batteries by automatically disconnecting loads when critical thresholds are reached. Designed to integrate seamlessly with the VE.Bus BMS, it provides a reliable second line of defence against cell under-voltage, over-voltage, and over-temperature conditions, ensuring your battery investment remains protected in demanding 24V and 48V DC systems.

Unlike generic relays, the Cyrix-Li-load responds directly to BMS control signals, eliminating the risk of deep discharge damage that can permanently reduce lithium battery capacity. Its low current consumption of less than 4 mA when open minimises parasitic drain, a critical advantage for off-grid and mobile installations where every watt-hour counts.

How the Cyrix-Li-load Enhances System Reliability

In a typical lithium battery setup, the VE.Bus BMS monitors individual cell voltages and temperatures. When it detects an imminent under-voltage event, it signals the Cyrix-Li-load to disengage the load circuit. This immediate response prevents cells from dropping below safe voltage levels, a common failure point in poorly managed systems. After disconnection, the battery voltage often recovers slightly, and the Cyrix will attempt to re-engage after 30 seconds. If the underlying issue persists, it will lock out after three attempts until a proper charge cycle restores voltage above 13 V (26 V or 52 V for 24V/48V systems) for at least 30 seconds.

This intelligent re-engagement logic avoids nuisance cycling while ensuring loads are only reconnected when the battery is genuinely ready. For installers, this means fewer callbacks and greater confidence in system uptime.

Key Features

• BMS-Controlled Load Disconnect: Directly interfaces with Victron VE.Bus BMS for automated protection against cell under-voltage, over-voltage, and over-temperature.
• High Continuous Current Rating: Handles 120 A at 24 V and 40 A at 48 V, suitable for most auxiliary loads in mobile and off-grid applications.
• Ultra-Low Standby Consumption: Draws less than 4 mA when open, preserving battery charge during storage or idle periods.
• Robust Enclosure: IP54-rated housing protects against dust and water splashes, with compact dimensions of 46 x 46 x 80 mm for easy installation in tight spaces.
• Integrated Transient Suppression: Built-in voltage spike protection safeguards connected equipment during sudden disconnections.
• Clear Status Indication: Multicolour LED provides at-a-glance operational state, simplifying diagnostics.

Installation and Integration

The Cyrix-Li-load features M8 (approx. 5/16") stud terminals that accept heavy-duty lugs, ensuring secure, low-resistance connections for high-current wiring. Its side mounting flanges allow straightforward attachment to flat surfaces, while the integrated wiring diagram on the unit aids correct setup. The control interface connects directly to the BMS, requiring no additional programming or complex configuration.

For systems where the VE.Bus BMS cannot directly control all loads or chargers, the Cyrix-Li-load acts as an essential intermediary, extending protection to devices that lack native BMS communication. This is particularly valuable in retrofits or mixed-brand installations where compatibility is a concern.

Applications

This relay is ideally suited for:

• Marine and RV house battery systems requiring automatic load shedding to prevent deep discharge.
• Off-grid solar installations where lithium batteries power inverters, lighting, or DC appliances.
• Industrial backup power systems demanding fail-safe battery protection.
• Any 24V or 48V LiFePO4 setup using a Victron VE.Bus BMS for centralised management.

By isolating loads during fault conditions, the Cyrix-Li-load helps maintain battery health and extends cycle life, reducing total cost of ownership over time.

Why Choose the Victron Cyrix-Li-load?

Compared to standard voltage-sensing relays, the Cyrix-Li-load offers precise, BMS-driven control that reacts to cell-level conditions rather than aggregate battery voltage. This granularity is critical for lithium chemistries, where a single weak cell can trigger a cascade failure if not addressed promptly. The relay's fast disengagement and intelligent re-connection logic minimise downtime while maximising safety.

With a weight of just 0.11 kg, it adds negligible mass to mobile installations, and its IP54 rating ensures reliable operation in engine rooms, battery compartments, and outdoor enclosures.

Equip your lithium battery system with the Victron Cyrix-Li-load 24/48V-120A for dependable, automated load protection. Order today to enhance the safety and longevity of your energy storage investment.