Victron Energy Cyrix-i 12/24V-400A Intelligent Battery Combiner

Victron Energy Cyrix-i 12/24V-400A Intelligent Battery Combiner

The Victron Cyrix-i 12/24V-400A is an advanced battery combiner designed for high-current DC systems. With automatic voltage-based switching and intelligent software logic, it safely connects and disconnects batteries without manual input—making it perfect for automotive, RV, marine, and off-grid energy systems operating at 12V or 24V.

This smart relay offers bidirectional sensing, starter battery prioritization, and zero voltage loss, making it a superior alternative to traditional diode isolators. Its rugged 400A continuous current rating and peak surge capacity of 2000A ensure reliable performance under heavy load conditions.

Key Specifications

• Model – Cyrix-i 12/24V-400A

• Type – Intelligent battery combiner / Voltage-sensitive relay

• System Voltage – 12V or 24V DC (auto-sensing)

• Continuous Current Rating – 400A

• Peak Current Rating – 2000A (1 second)

• Input Voltage Range (12/24V model) – 8–36 VDC

• Connect/Disconnect Profiles – 4 programmable profiles based on voltage/time thresholds

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

• Standby Current Consumption – <4 mA

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

• Remote Monitoring Support – Micro switch included

• 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-mountable design

Features & Benefits

• Smart Voltage Monitoring – Monitors voltage trends, not just fixed thresholds, to prevent premature or false switching.

• Auto Voltage Detection – Instantly adapts to 12V or 24V battery banks with no manual configuration.

• Lossless Power Transfer – Avoids voltage drops commonly seen with diode isolators.

• Bidirectional Operation – Will close the relay even if the auxiliary battery is charging from a source.

• Starter Battery Protection – Always ensures the starter battery is charged before engaging auxiliary loads.

• Emergency Parallel Mode – Manual override switch allows batteries to be joined in emergencies.

• Selectable Profiles – Four connect/disconnect behavior modes are available for different system needs.

• Failsafe Logic – Will not connect at low voltage (<2V) or disconnect prematurely due to dips.