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).

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:

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

Does anyone have an idea?

Every advice is very much appreciated!

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nickdb ♦♦ commented · Apr 23 at 05:35 AM

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 ♦ nickdb ♦♦ commented · Apr 23 at 07:10 AM

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

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cflenker Alexandra ♦ commented · Apr 23 at 08:26 AM

All DC voltage measurements are quite the same (VE-Bus, SmartShunt, SerialBatteryDriver) and all are far above CVL.

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Al commented · Apr 23 at 10:11 AM

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 Al commented · Apr 23 at 11:10 AM

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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Al cflenker commented · Apr 23 at 11:29 AM

I'm not sure as I've not checked myself when CVL is limiting, but if you look on dbus-spy at your BMS (Serialbattery JKBMS) and Info/MaxChargeVoltage when you hope to see limiting, does it reduce? If it does, is it also the same for the system: Control/EffectiveChargeVoltage? I assume it should pass on the CVL voltage to System.

You could install batteryaggregator then you could see on the remote console the aggregator in device list and parameters tab will show the called for CVL. < but that's maybe a lot of hassle to install everything and set up just to check.

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