Victron Energy Cyrix-i 12/24V 400A Intelligent Battery Combiner is a high-current intelligent combiner relay for paralleling starter and house batteries in 12V/24V systems — best for RV, marine, and dual-battery owners replacing lossy diode isolators. Now $51.75, about 51% off the $105.00 compare-at price. Buy online and save $53.25.
How the Start Assist Button Works
Press the Start Assist button (or a remote switch) and the Cyrix-i engages for 30 seconds to parallel both batteries — an emergency jump-start when the starter battery is discharged or damaged. If charging voltage rises enough, it stays engaged to continue charging.
Cyrix-i 400A vs Cyrix-ct 120A
The Cyrix-ct 120A suits smaller charging sources; the Cyrix-i 400A handles high-output alternators and large banks. Choose the 400A when alternator output or combined loads exceed 120A continuous.
Lithium Compatibility
The Cyrix-i works in 12V/24V systems; for BMS-managed lithium banks, use the Cyrix-Li-Charge / Cyrix-Li-Load models, which respond directly to BMS control signals.
Replacing a Diode Isolator
Disconnect and remove the diode isolator, connect the Cyrix-i main terminals between both battery positives, and mount near the batteries. Unlike diodes, the Cyrix-i has virtually no voltage drop — no alternator voltage compensation needed.
Specifications
- Brand: Victron Energy
- Model: Cyrix-i
- Product Type: Intelligent battery combiner relay
- System Voltage: 12/24V DC
- Current Rating: 400A
- Features: Trend-based intelligent switching, over-temperature protection, Start Assist (30 s)
- Voltage Loss: Virtually zero (diode isolator replacement)
Price and Deal Value
Buy at $51.75 — a $53.25 discount off $105.00. Stack coupon OUTPOST12 for an extra 12% off and cross $45 for free shipping. Genuine Victron dual-battery management at discount-retail value.
