Quattro reads wrong voltage (Higher)

Q&A and troubleshooting
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1

Hello everybody,

On my boat I have a Quattro, Victron Lithium Batteries, VE.BUS BMS, Cerbo, BMV, and several MPPTs and several other components that are networked. Recently my Quattro started going into Float during running the Generator. For some reason, the Quattro is sensing voltage that is about 0.4 volt higher than the actual battery voltage and even the voltage that I measure at the DC Connections inside of the Quattro. It seems that it is thinking that the voltage is higher. (This happens even when the Generator is not running, and when the inverter is running).
I am now in the french polynesia and my dealers are in the other parts of the world, so I am trying to figure out how to get help… (I contacted the local dealer and he said that he really cannot help me unless I bring the device in his shop and then he would need to figure out which part to order from Victron and send and that would take weeks if not months).
So I am trying to at least troubleshoot what’s wrong with the device. This started happening about a month ago, prior to that the charging was correct and the system would fully charge before going to float.
To recap:
All my devices are networked. All of them are showing the proper voltage (let’s say 13.2 volts). I measure using multimeter at the battery, and it shows 13.2. I measure inside of the Quattro, and it shows 13.19. But in the Cerbo, when I go to Quattro - it shows 13.6. Or if it is sunny, and my voltage on the batteries, BMV and mppts is showing 13.5 volts, the Quattro is showing 13.9 .

Please advise.

Thanks

2

Welcome.

Do you have DVCC enabled?
Is the BMV set as the battery monitor?

1 Like
3

I dont have the DVCC Enabled because the Cerbo is not connected directly to the Batteries, and it is connected to the bus bar inside of the boat. So if the ‘Battery Protects’ turn off the ‘House’, the Cerbo is also turned off.
BMV is set as Battery Monitor. And it is networked with all the MPPTS and I assumed that it was also with Quattro…

4

Its the voltage drop over the cables while charging.

5

If the mppts are connected to the cerbo with the inverter and bmv there is no need for the smart network.
And then with SVS in DVCC the system will base what it needs to do on the bmv reading.

6

It is not a drop in voltage. The voltage is higher. And it is not during charging. All the time when the inverter is on , the voltage that shows coming from Quattro is higher than the actual batteries. Whether the MPPTs are on or not.

7

I cannot have the DVCC. Because the Cerbo is not connected to the batteries. They are behind the battery protects.

8

Electrically or with communication? If electrically that is irrelevant.
With comms the bmv with ve direct connects to the cerbo for soc and voltage which is shared with the mppts etc.