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cflenker avatar image
cflenker asked

CVL of DVCC does not work

We are operating 5 quite similar victron 3phase systems with ac-out connected pv-inverters and diy lf280k battery packs with serialbattery-driver.

The serialbattery-driver reduces CVL (charge voltage limitation) if a single cell rises above 3.46v to prevent overcharging of this single cell and give time to the active balancer (jkbms).

This works fine for 4 of the 5 systems.

But the 5th systems seem not to obey CVL especially when we have high pv-Power (i don't understand this dependancy - grid is on and the pv-power can be fed into the grid).

1713839057452.png

I checked all settings and compared them to the other 4 systems that work fine.

The only difference I can see is the way the serialnummer of the multiplus are displayed in the remote console:

Here the system that does not work:

1713839345452.png

1713839385268.png

For the other 4 good working systems only the present devices are shown:

1713839511194.png

Does anyone have an idea?

Every advice is very much appreciated!

Multiplus-IIDVCCserialbatterycvl
1713839057452.png (64.8 KiB)
1713839345452.png (20.0 KiB)
1713839385268.png (18.8 KiB)
1713839511194.png (17.8 KiB)
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nickdb avatar image nickdb ♦♦ commented ·
Same Cerbo versions and firmware?

The serial driver is unsupported, so if the obvious is eliminated then, this is better off moved to modifications section.

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Alexandra avatar image Alexandra ♦ nickdb ♦♦ commented ·

In commissioning was there any differences noted on the ve bus dc measurements?

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cflenker avatar image cflenker nickdb ♦♦ commented ·
Thank you for moving to the correct chapter.

Cerbo-S GX is on the newest Version V3.30.

On the other systems we use Cerbo GX (without -S) but same Firmware Version V3.30.

May this be the Problem? I think Cerbo-S GS should work as well. Don't you think so?

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Al avatar image Al commented ·
I guess you only have one BMS for each installation, so you don't need battery aggregator? The Pulquero aggregator needs an edit to the config. JSON to allow serial battery CVL limitation to work as expected.
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cflenker avatar image cflenker Al commented ·

Hello @Al, thanks for your hint. In this installation we only use one battery-pack and only one BMS. I can only measure the CVL that comes out of the serialbattery-driver. This CVL is correct. It would be interesting to measure the CVL on the VE.Bus to the Multis. But I don't have an idea how to do this. Is there a way to do this?

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