Victron Cyrix-Li-load 24/48V-120A Intelligent Load Relay | CYR020120450

The Cyrix-Li-load is a microprocessor-controlled load relay for lithium battery systems running at 24V or 48V. It disconnects non-essential loads once the battery reaches a low-voltage threshold, protecting cells from deep discharge, and is rated at 120A continuous for demanding DC load circuits.

Key features

• Current rating, 120A continuous, suited to substantial DC load circuits at 24V or 48V.
• Switching logic, microprocessor controlled, monitors battery voltage and disconnects loads at a programmable low-voltage threshold.
• Battery chemistry, designed specifically for lithium systems, where accurate low-voltage disconnect matters for cell longevity.
• Reconnection, automatic once battery voltage recovers to the set reconnect threshold, no manual intervention needed.
• Weight, 0.12 kg, compact enough for tight battery enclosures or distribution panels.
• System voltage, works on 24V or 48V DC systems.

How it works

The relay continuously monitors battery terminal voltage. When voltage drops to the low-voltage disconnect threshold, it opens and isolates connected loads from the battery, preventing discharge beyond safe limits. This matters most on lithium chemistries, where over-discharge can cause permanent cell damage or trigger a battery management system shutdown.

Unlike a fuse or manual isolator, the Cyrix-Li-load reacts automatically to battery state. Once the battery recovers, the relay closes again and restores power to the loads, making it suited to unattended installations such as remote cabins, liveaboard vessels or vehicle auxiliary systems.

Applications

• Low-voltage load disconnect on lithium battery off-grid systems at 24V or 48V.
• Marine auxiliary load protection on liveaboard or commercial vessels with lithium house banks.
• Vehicle and motorhome auxiliary circuits needing battery protection without manual switching.
• Remote off-grid cabins and telecoms sites where unattended operation is essential.
• Load shedding in solar storage systems to protect the battery during low charge periods.

What's in the box

• 1 x Cyrix-Li-load 24/48V-120A intelligent load relay

Installation notes

Fit this with a qualified electrician or systems integrator familiar with DC battery installations. Check the unit is rated for the total connected load current and that appropriate fusing sits on all battery connections. It's intended for lithium battery systems, so confirm compatibility with your battery management system beforehand. Marine installs should follow applicable NMEA and flag-state wiring standards.