Distribution
Victron Cyrix-Li-Charge 230 wiring diagram
BMS-controlled charge disconnect relay for lithium systems, 230 A. Installs between a charge source and the lithium bank; engages only when charge voltage is present and the BMS allows charging, and opens on the BMS charge-disconnect signal.
Wiring diagram
How the Cyrix-Li 230 is wired.
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Cable sizing for this example
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Installation notes
Before you install.
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Verified against the manufacturer's documentation, checked 2026-09-29. Manufacturer documentation →
Which Cyrix-Li 230 is this?
The catalog and product label identify the Cyrix-Li-Charge 12/24-230. Victron's two-page instruction sheet covers three different devices: Li-Charge connects a charger, Li-load disconnects loads, and Li-ct combines starter and lithium batteries. Use the Li-Charge column and top connection diagram. Li-ct voltage thresholds and its start-assist function do not describe this component.
The Li-Charge is a relay controlled by a BMS, not a charger or a stand-alone lithium protection system. It does not set a charging profile or limit charge current. The battery and charger still need to be compatible, and a BMS must decide when charging is allowed.
How do A and B map to the real unit?
Use canvas A for the charge-source positive and B for the lithium-bank positive. On the housing these main connections are labelled Charger + and Li-ion Battery +. The manufacturer's diagram includes a fuse between the battery and relay. Size protection for the cable and system; the sheet does not prescribe one fuse value or a stud-tightening torque.
The two canvas terminals omit essential control wiring. The supplied control cable must connect to battery negative and the BMS charge-disconnect output, as shown on page 2. A high control input, approximately battery voltage, permits connection; floating or low commands disconnection. Check the BMS output's compatibility rather than treating the relay as an ordinary two-wire switch.
Why might the relay remain open?
For a 12 V installation, closing requires BMS permission, at least 13.0 V on the charger connection, and at least 2 V on the battery connection, followed by a 3-second delay. The charger threshold is 26.0 V for a 24 V installation. No connected battery means no closure. Loss of BMS permission opens it immediately.
While closed, it opens after one hour to check that the charger remains available, then reconnects after the delay if the required charger voltage returns. With little discharge, battery voltage may stay high after a charger is switched off, so immediate separation is not guaranteed.
What does the 230 A rating mean?
The sheet rates continuous current and breaking capacity at 230 A for 12/24 V, with under 4 mA consumption while open and an IP54 enclosure. It also lists a separate 24/48 V variant whose 48 V breaking capacity is only 80 A. That variant is not the 12/24 V product pictured here; do not extend this catalog entry to a 48 V design.
Fit check
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Technical reference
Specifications and terminal map.
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Catalog specification
BMS-controlled charge disconnect relay for lithium systems, 230 A. Installs between a charge source and the lithium bank; engages only when charge voltage is present and the BMS allows charging, and opens on the BMS charge-disconnect signal.
Connection limits are listed in the terminal map. Use the manufacturer's documentation for the full specifications.
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
A
neutral · input
B
neutral · output
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
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