Howto disable BMS control, while keeping CAN-bms connected

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ryanb asked Oct 12, '20

Howto disable BMS control, while keeping CAN-bms connected

Hi everyone,

Below it shows that BMS control is enabled automatically when a BMS is present:

Is there a way to disable BMS control, so that the MPPT manages charging the battery from its own charge settings, while also having the measurement info (SOC for example) from the BMS displayed via CAN?

MPPT Controllers BMS DVCC

bms-control.png (49.1 KiB)

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Answer 1 · 2020-10-13T22:30:34Z

Daniël Boekel (Victron Energy Staff) answered · Oct 13, 2020 at 10:30 PM

Hi @ryanb

This is not possible, it's a safety feature.

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ryanb commented · Oct 14, 2020 at 07:08 AM

Interestingly enough, I have found that if I disable DVCC (venus version 2.33), then the MPPT does in fact adjust to its own float voltage (which is below the maximum charge voltage sent from the BMS), yet the MPPT still displays that it is under 'BMS control'.

If DVCC in on however, then the MPPT always follows the 'max charge voltage' parameter sent from the BMS via CAN-bus.

This solves our situation, so thank you Victron.

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Daniël Boekel (Victron Energy Staff) ♦♦ ryanb commented · Oct 17, 2020 at 09:37 AM

@ryanb

Ah yes of course...with most CANbus batteries DVCC is automatically enabled, but not all...

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Answer 2 · 2023-01-01T15:40:39Z

over-and-under-victron answered · Jan 01, 2023 at 03:40 PM

I don't understand the safety aspect?

The only reason I've plugged in my BMSs to the Cerbo is for monitoring and data logging.

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