Victron Energy Cyrix-i 24/48V-400A intelligent battery combiner

Victron Energy Cyrix-i 24/48V-400A Intelligent Battery Combiner

The Victron Cyrix-i 24/48V-400A is a robust, intelligent battery combiner engineered for high-current DC systems. Designed to manage multiple battery banks efficiently, it automatically connects and disconnects batteries based on voltage trends, rather than just thresholds. This prevents unwanted switching and ensures safe parallel charging without voltage loss—making it ideal for marine, automotive, off-grid, and industrial applications operating at 24V or 48V.

Unlike traditional diode isolators, the Cyrix-i offers zero voltage drop, supports bidirectional sensing, and features intelligent starter battery prioritization, ensuring your essential systems stay powered when needed most.

With a continuous current rating of 400A and peak performance up to 2000A for 1 second, it is perfectly suited for demanding environments where high reliability is a must.

Key Specifications

• Model – Cyrix-i 24/48V-400A

• Type – Intelligent battery combiner / Voltage-sensitive relay

• System Voltage – 24V or 48V DC (auto-sensing)

• Continuous Current Rating – 400A

• Peak Current Rating – 2000A (1 second)

• Input Voltage Range (24/48V model) – 16–72 VDC

• Connect/Disconnect Profiles – 4 programmable profiles (based on voltage/time trends)

• Over-voltage Disconnect – 16V / 32V / 64V (depending on system)

• Standby Current Consumption – <4 mA

• Emergency Start Function – Yes (30 s push-button assist)

• Remote Monitoring – Micro switch for status feedback

• Status Indicator – Bi-color LED

• Dimensions (H x W x D) – 78 x 102 x 110 mm (3.1 x 4.0 x 4.4 in)

• Weight – 0.9 kg (2.0 lbs)

• Connect Terminals – M8

• Mounting – Surface mount with integrated bracket

Features & Benefits

• Intelligent Voltage Monitoring – Uses voltage trend analysis to avoid false connections.

• Auto Voltage Detection – Supports both 24V and 48V systems with no manual switching.

• Zero Voltage Loss – Replaces diode isolators without efficiency loss.

• Bidirectional Sensing – Operates when either battery receives charge (e.g., via alternator or charger).

• Starter Battery Priority – Ensures the starter battery is charged before connecting auxiliaries.

• Emergency Parallel Function – Manual override allows temporary connection in case of battery failure.

• Multiple Connection Profiles – Selectable behavior for various applications (see datasheet).

• Enhanced Safety – Will not connect at <2V or disconnect too early due to transient dips.