question

ryanb avatar image
ryanb asked

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 ControllersBMSDVCC
bms-control.png (49.1 KiB)
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1 Answer
Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @ryanb

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

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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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@ryanb

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



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