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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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Related Resources

LED indications, warnings, alarm and error codes

Lynx Smart BMS product page

Lynx Smart BMS online manual

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