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luigi-miranda asked

Problem with Lynx Smart BMS

Help please! I have a problem with my Lynx Smart BMS in my sailboat.

The setup is: Multiplus II, Lynx Smart BMS, Smart Battery Protect 200 (for loads), Lynx Distributors, Victron Lithium Battery Smart 200ah x 5 in parallel, Cerbo GX with Touch 50, and Orion Tr Smart 12-30.

The Lynx Smart BMS sometimes shuts down in full (bluetooth stays on), leaving the boat with no power at all. It doesn’t send or logs any pre- alarms or warning. It simply opens the contactor and shuts itself off except bluetooh. Batteries are fully charged, all cells balanced and normal temperature. This has happens about an hour or so after turning the Multiplus off with only about 20amps of loads.

How can this happen with no alarms or warnings? As understand, any low voltage would trigger/close the ATD and force the battery protect to open. Even if that would fail, the Lynx BMS is supposed to trigger a pre-alarm. But voltage is fine and no alarms.

multiplus ve.buslynx bms
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klim8skeptic answered ·

@Luigi Miranda @Stefanie (Victron Energy Staff) Sounds odd not to have any warning messages from the Smart BMS or Cerbo.

Have you gone through the Troubleshooting section of the manual?

When the problem happens again, check each battery via bluetooth for a start.

Then check each each batteries BMS cables for proper connection, soundness and damage.

After that look at 8.4.4 and preform the tests on the battery and BMS.

Hopefully it is just a loose BMS connector.

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Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ commented ·

@Luigi Miranda@klim8skeptic

This definitely should not happen. I can only think of a loose connection between battery and LSB, but this wouldn't explain why it is still accessible via Bluetooth, or the current exceeding the max 600A for 5 minutes.

However, more details needed ie. how is everything wired (wiring diagram), is there any error notification when connecting to the LSB via VictronConnect and the contactor is open, what is the mode and state in VictronConnect, what's the LEDs showing prior to and when the contactor opens, any graphs from VRM where one can see what exactly happens ie. voltage and current at the time of disconnecting the load side? The more information, the easier it is to find out what is wrong.

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luigi-miranda avatar image luigi-miranda Stefanie (Victron Energy Staff) ♦♦ commented ·

To your questios:

Please see attached diagram as it is right now.

There are no errors shown in VictronConnect when connecting to the LSB with contactor open.

See attached screen shot of LSB status exactly when the LSB shut down and contactor open.

The only LED of the LSB while shut off is the intermittent blue bluetooth led. There is also an orange status led that lights every 10 min or so and stays on for just about 3 seconds then turns off. LED’s are normal prior to shut off



2bed377a-bc14-4a28-8252-e080d9357f9f.jpeg

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2bed377a-bc14-4a28-8252-e080d9357f9f.jpeg (215.2 KiB)
Robert avatar image Robert luigi-miranda commented ·
Hello, how you made diagrams like this?

Best regards Robert

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luigi-miranda avatar image luigi-miranda Robert commented ·
Microsoft Visio
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luigi-miranda avatar image luigi-miranda Stefanie (Victron Energy Staff) ♦♦ commented ·

VRM graph

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10a19e03-15c7-4594-89e2-baafbd826de6.jpeg (316.4 KiB)
Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ luigi-miranda commented ·
Thanks and please ignore my previous comment. Deleted it.

I'll take a closer look.

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Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ luigi-miranda commented ·

Just to make sure the kill switch isn't defective and causing the problem, can you replace the switch with a jumper wire between pins 10 and 11 of the multi connector and see if the problem persists?

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luigi-miranda avatar image luigi-miranda Stefanie (Victron Energy Staff) ♦♦ commented ·
I checked the kill switch for continuity when on and off and it is OK. The thing is that the problem only has happened while the multiplus is OFF.
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Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ luigi-miranda commented ·

Strange indeed. But that could also be a coincidence. I'd just bridge pin 10 and 11 as previously stated, just to make 100% sure it's not the switch.

How exactly did you wire the comms cable between Multi and Cerbo GX? Did you check the RJ45 cable from the Multi plugs into the VE.Bus port of the Cerbo? Are LSB and Cerbo properly terminated on the VE.Can side?

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klim8skeptic avatar image klim8skeptic ♦ luigi-miranda commented ·

Something I noticed.

Is it possible to drive a 1000Ah of batteries down to 13.25v with only a 25a load?

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Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ klim8skeptic ♦ commented ·
I'd say yes. It's still 3.32V per cell. Idle voltage.
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luigi-miranda avatar image luigi-miranda Stefanie (Victron Energy Staff) ♦♦ commented ·

Battery status when shut off. I also checked each cel voltage of every battery and all where OKe806c041-91ac-4c9b-b49a-9ab0cb842114.png

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e806c041-91ac-4c9b-b49a-9ab0cb842114.png (364.1 KiB)

Related Resources

LED indications, warnings, alarm and error codes

Lynx Smart BMS product page

Lynx Smart BMS online manual

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Additional resources still need to be added for this topic