question

stourel avatar image
stourel asked

Cerbo DC Power

Hi everybody,


I have a Cerbo GX, together with a Quattro Multiplus 12V/5000, a BMV712 and a MPPT Solar from Victron.


I have been wondering about the power consumption of the Cerbo, which you can see on the picture is in the range of 70w to 130w. It is quite far away form the 20w mentioned in the forum and I wondering what is going on. Cerbo is the only 12v device connected to the battery,


I also noticed that the Ah deducted by the BMV 712 is higher that the real Ah consumed. for example, overnight the % of the batterie decrease from 100 to 90% and the following day, the battery charge to 95% reaching floating. The BMV noticed that the battery are full and reajust the SOC to 100%.


The problem is if I am not reaching the required voltage corresponding to 100%, the SOC reduce too much from about 5% everyday. for example 1 week ago, my battery voltage was 12,8V under 250w consumption but the SOC was 60%. This can not be right.


Can somebody help me? I hope it is quite understandable.


Thank you.




Best



Sylcerbo-gx-160522.jpg

cerbo gx
cerbo-gx-160522.jpg (41.4 KiB)
1 comment
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra avatar image Alexandra ♦ commented ·

@stourel

If you disconnect averything from the bmv do you see a current draw?

You may have to do a zero current calibration.


1 Like 1 ·
2 Answers
stourel avatar image
stourel answered ·

Hi Alexandra,

Thank you for your reply. How can I disconnect everything from the BMV? Inverter off, cerbo unconnecting. what else?

12 comments
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Alexandra avatar image Alexandra ♦ commented ·

Hi @stourel

The instructions are here.

Once everything is off, you have to physically disconnect everything from the load side of the shunt.

Use Victron Connect to see what the BMV says is happening. If it sbows no current draw then you dont need to do the zero current calibration.

If it is showing current draw with nothing connected then go to battery settings and at the bottom you will see the option.

screenshot-20220516-192617.jpg


1 Like 1 ·
Show more comments
stourel avatar image
stourel answered ·

one is sure, the consumption was more inacurate before the zero calibration


2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.