Victron Multi RS 48/6000 + JK BMS CAN Communication

Victron & JK BMS

JK BMS and Multi RS Solar: CAN setup guide

Connecting a JK inverter BMS to a Victron Multi RS Solar 48/6000 involves three separate checks: the CAN connection, the battery data reaching the GX device, and the inverter responding to the battery’s limits. Getting the battery to appear on screen is only part of the job.

This guide focuses on the JK-PB2A16S20P and the community-reported setups linked below. It brings the wiring, configuration and troubleshooting advice into one place, while keeping the original discussions available for their screenshots and hardware details.

Before you start: confirm the exact hardware

Record your JK BMS model and hardware/firmware versions, the GX model, Venus OS version and Multi RS firmware. Ask the battery or BMS supplier for the matching CAN pinout, Victron protocol instructions and supported charging settings. A working example with another JK revision is a useful lead, but does not establish compatibility for yours.

JK is not listed on the Victron battery compatibility page checked for this guide. Victron provides limited support for DIY BMS systems; the DVCC manual says to enable DVCC only where it is explicitly supported for the battery type. Confirm the integration with your supplier before commissioning it. The battery must retain its own independent protection and disconnect capability.

1. Keep the two CAN networks separate

For the 500 kbit/s JK CAN arrangement discussed here, the communication paths are:

Multi RS Solar → GX VE.Can interface: 250 kbit/s.
JK BMS CAN → separate GX CAN interface: configured for the battery’s 500 kbit/s BMS profile.

On an original Cerbo GX, the dedicated BMS-Can interface is fixed at 500 kbit/s. A Cerbo GX MK2 has two configurable VE.Can interfaces. Two RJ45 sockets on one interface are part of the same bus; they do not provide two independent networks.

Terminate both ends of the Multi RS VE.Can network. On the battery network, fit the GX terminator and follow the battery manufacturer’s termination instructions. Check for built-in termination before adding more resistors.

The Multi RS connects to a GX through VE.Can; its VE.Direct connection is not a substitute for this link. See Victron’s CAN interface and RS connection guidance. The original Multi RS protocol discussion is retained for the reported loss of PV/load data when the bus configuration was changed.

2. Match the cable to the JK pinout

Use the JK port identified as CAN in the documentation for your exact unit. Do not identify it solely by socket position or plug it into an RS485 port because the connector fits.

Victron Type A and Type B cables have different battery-side ground connections. Neither is a universal “JK cable”. Match CAN-H, CAN-L and ground to the supplied BMS pinout, and observe the cable’s battery/GX end labels. Do not assume ground can be omitted.

Use the official Victron cable pinout guide when checking the cable. The original JK inverter BMS not visible discussion remains useful for port and protocol troubleshooting; its cable advice should be checked against your hardware documentation.

3. Check the JK CAN protocol

The linked community setup discussion includes a report using protocol 4 and a Type A cable. Treat the number as a reference to that setup: select the Victron CAN profile specified for your JK firmware and confirm its bitrate with the supplier. Do not change an RS485 protocol setting and assume CAN has changed too.

After configuration, look for the battery in the GX device list. Check that voltage, current and state of charge update and agree reasonably with the JK app. Then inspect the battery’s parameters for charge voltage and current limits. Record any missing fields or alarms before moving on.

4. Verify BMS control through DVCC

In a supported managed-battery setup, DVCC passes the battery’s charge voltage limit (CVL), charge current limit (CCL) and discharge current limit (DCL) through the GX system. Current GX documentation places these controls under Settings → System Setup → Charge Control; older versions use Settings → DVCC.

Check the controlling BMS selection separately from the battery monitor used for state of charge. A SmartShunt or BMV can supply SoC while the BMS remains responsible for DVCC limits. Do not enable every shared-sensing option by default; follow the battery-specific instructions. See Victron’s DVCC requirements and settings.

During commissioning, confirm the Multi RS reports BMS/external control and that its charging behaviour respects the transmitted limits. Seeing SoC alone does not establish this. The original Multi RS charging discussion illustrates why battery visibility and effective control need separate checks.

Troubleshooting

The battery does not appear

Start with the CAN socket, cable pinout and orientation, selected JK protocol, GX interface profile and termination. Compare each item with the exact hardware documentation. Changing several settings together makes it harder to identify the cause.

Multi RS readings disappear

Recheck the two network paths above. A battery profile applied to the Multi RS interface is a reason to revisit the bus configuration before investigating the inverter itself.

The battery appears, but control is missing

Capture the battery parameters and alarms, the controlling BMS selection and the Multi RS status. Ask the supplier to confirm the expected CAN data for that firmware. Avoid treating a reboot or a correct-looking SoC percentage as proof that the issue is resolved.

Charging cycles or over-voltage protection trips

Record the highest and lowest cell voltages, battery current, requested CVL/CCL and the JK alarm at the time of the event. Have the battery supplier review cell balance and charging targets against the cell specifications. Do not raise protection thresholds or bypass the BMS to suppress an alarm.

Victron’s DIY BMS compatibility notes explain that charge-limit behaviour near full charge can cause unexpected warnings. The original JK charging/discharging cycling discussion and RS 450/200 over-voltage discussion are retained as troubleshooting background. The latter concerns an RS 450/200, not the Multi RS Solar 48/6000, so it should not be treated as a matching installation guide.

Original discussions and further reading

JK BMS + Multi RS Solar protocol issue — reported setup, CAN networks and protocol selection.
Cerbo GX BMS-CAN — JK inverter BMS not visible — connection and detection checks.
Nearly no solar preference after factory reset — Multi RS — battery data and BMS control.
Battery overcharging hitting OVP — JK BMS + Victron RS450/200 — charging troubleshooting on different RS hardware.
JK BMS jumping charging/discharging — community discussion of cycling behaviour.

Use these reports alongside the current manufacturer instructions. If requesting help, include the exact models, firmware versions, a sketch of both CAN networks and screenshots of the battery limits and active alarms; that gives your supplier much more to work with than “the BMS is connected”.