question

Sarah avatar image
Sarah asked

VE.Can - who’s the Boss when the Multiplus II is off.

914deb86-4310-4dc9-845c-ef9863f08764.pngdear brains trust,

I have two MPPT controllers connected to my VE.CAN bus along with a Cerbo GX and Lynx Shunt. My batteries are AGM and unmanaged. I also have a Multiplus II interfacing with the CerboGX. My understanding is that when the Multiplus is inverting/charging it takes control of the charge algorithm as indicated by ‘External Control’ display on the MPPT controllers. This continues even when the Multiplus II has been turned off for several days. I have tried to configure Bluetooth VE.Smart to no avail. So what I want to know is when the Multipluss II is out of town who is wearing the pants (and where do I change the maximum absorption time - as the devices do not revert to float mode - I have also changed the maximum absorption time settings in both MPPT controller with no impact. Devices are configured for Victron AGM batteries with a maximum 6 hour absorption and adaptive charging). I have an 1180 AGM 12 v bank and after a day of absorption battery charge is minimal yet no float. All software is up to date including Venus 8.89.36.
kind regards

Sarah

Multiplus-IIMPPT Controllerscerbo gxVE.Can
914deb86-4310-4dc9-845c-ef9863f08764.png (642.3 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

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

2 Answers
bathnm avatar image
bathnm answered ·

I am surprised to see the MPPTs in external control. You say you have AGM batteries and therefore there is nothing to be driving that external control. Take a look at the DVCC portion of the GX Manual (here). Section 8.3, has a great table that would imply the MPPTs are controlling teh charge algorithm.

You also mention that the Venus version is 8.89.36, that is not a standard Venus OS version number.

Maybe turn DVCC off on the CerboGX, as it is really not doing much for you.

Using DVCC and VE.Smart is not a valid configuration, it is one or the other.

7 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

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

Sarah avatar image Sarah commented ·
Hi Bathnm, you are correct re Venus OS version we are running 2.80.36 (the latest beta release). Thanks for the link to the DVCC documentation - the scenario that I am describing seem to match the ESS Assistant config described in section 8.3. Which is great except I don’t have any ESS Assistants configured. I’ll try dialing back DVCC see what effect that has. Thanks for your input.
0 Likes 0 ·
bathnm avatar image bathnm Sarah commented ·
@Sarah it might also be worth reverting back to released code and understanding what is happening. You may have uncovered a bug/problem with the beta release. If everything works as expected with DVCC on, in the last released code (2.73 I think). Then I would report the problem in the beta thread here so Victron can investigate.
0 Likes 0 ·
Show more comments
bathnm avatar image
bathnm answered ·

@Sarah glad it has all worked out

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

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