Question about Venus OS and multiple VE.Bus systems

[wolferl]

referring to “Control MK3-USB connected inverter/charger system” in DVCC

I set up a system with 3 MP-II for a 3 phase ESS system today, which works flawlessly. Added a 4th MP-II to charge the battery via generator, hardware is wired and 4th MP-II shows up in Venus-OS.

I need to add, that I use a Pi4 with two MK3 interfaces, so no internal VE.Bus connector.

Is there any documentation available how to configure the 4th MP-II connected via separate MK3 USB interface? Are there any assistants needed and is CVL, CCL and DCL also reflected in the dbus path of the 4th MP-II?

Is the minimum SOC also reflected in the 4th MP-III? I see that the primary system (3 phase) is not charging as the minimum SOC is reached while the secondary system (single MP-II in Charging only mode) is still charging, even if the minimum SOC is already achieved…

If there is any documentation available, a link would be great, I couldn’t find on.

Thank you for the great feature!!!

[BartChampagne]

First, I don’t see why your post is relevant to the VenusOS v3.70 beta testing, so you’re probably in the wrong group.
Second: even though it works, your configuration is highly unsupported so you won’t find a lot of help or documentation for it here.

That being said:

• You can download/upload the configuration of each VE.Bus system via VRM and edit with VEConfigure3
• There are no assistants related to running multiple VE.Bus systems on the same GX
• For CVL/CCL/DCL, the only reference I could find was this:

@mpvader

v3.70~29 up to and including v3.70~32

• DVCC: Add limited CCL control for second Multi aka VE.Bus systems connected to a GX using an MK3-USB. Having such control at all was introduced in a recent official release, but didn’t include CCL control of the second Multi. The use case for which it’s added now is when having each system connected to a different AC source, for example one to the grid and the other to a generator. And the feature is that when a BMS requests a complete stop of charging, for example due to low cell temperature or high cell voltage, it now also stops charging by the 2nd Multi.

• For the dbus paths I’m not sure, your best bet is to check for yourself with dbus-spy or MQTT Explorer
• Minimum SoC is an ESS specific parameter, since your 4th MP doesn’t participate in the ESS setup, it is not affected by it.

Disclaimer: info might be wrong, there are posts addressing a 2nd VE.Bus system on the same GX though.
Search hard and ye shall find.