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sum1youno avatar image
sum1youno asked

VE.Bus BMS v2, Multiplus control with Venus OS on Raspberry Pi

I have a system comprising:

  • 3x 100ah Smart Lithium Batteries
  • VE.Bus BMS v2 (replaced a previously installed VE.Bus BMS v1)
  • Multiplus 12/1600 (firmware v506)
  • Venus OS (v3.40~2) on a Raspberry Pi 4 (connected to VE.Bus BMS v2 via MK3-USB)

I have been trying to get the remote-control for the Multiplus working in VRM and the Venus GUI, but have had no luck; instead I receive the "this setting is disabled when a VE.Bus BMS is connected" error.

I don't seem to see a separate device in Venus OS for the VE.Bus BMS v2, but see the following firmware and version information underneath the entry for the Multiplus:

  • VE.Bus version: 2663506
  • MK2 device: MK3
  • MK2 version: 1170216
  • Multi Control version: --
  • VE.Bus BMS version: 1146113

I have double and triple checked the VE.Bus connections between the VE.Bus BMS v2, the raspberry pi (via MK3-USB) and the Multiplus, and they are correct as-per the installation manuals as far as I can tell. I have also reset all of the multiplus settings in case there was something incorrect there. Using the 'redetect VE.Bus system' button does not make a difference.

Are there known issues with using a MK3-USB and Raspberry Pi instead of a full Cerbo in this situation? Should the remote control functionality work in this setup?

Venus OSRaspberry Pimultiplus ve.bus
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ejrossouw answered ·

@sum1youno Try using the offical version of Venus OS and not beta (?) as well as update all the firmware on all the devices and let us know how that worked out. Maybe consider the modifications space where you may find other answers on this topic.

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sum1youno avatar image sum1youno commented ·

Thanks @ejrossouw.

I have made sure I'm up-to-date on all firmware, and have reverted to the latest official Venus release, but still have the same problem:

1715843479111.png

This is the current state of firmware on my devices (from VRM):

1715843573892.png

As you can see, the VE.Bus BMS v2 is recognised here, so not sure what/where the problem is.

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ejrossouw avatar image ejrossouw sum1youno commented ·

I do not have experience with pi, but have see this on one occasion on my testbench (cerbo), but all is well today although as per below I should not be able to control the system, yet I can ?? Inverter is on firmware 510, latest venus beta 3.40-13 (original interface) and selected the VE.Bus BMS option in VE.Config.

1715853986868.png

1715853699185.png

1715853750782.png


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sum1youno avatar image sum1youno ejrossouw commented ·

Yes, that is identical to my VE Config (except for the charge current setting):

1715858941426.png

Interestingly, when I tried resetting the Multiplus settings (then selecting Lithium batteries without VE.BUS BMS) and reconnected everything (following the commissioning example here), the system reconfigured itself automatically, checking the 'Configured for VE.Bus BMS' checkbox and selecting the Lithium i.c.w. with VE.Bus BMS battery type. Going from the commissioning example, this seems like correct/expected behaviour.

I feel like there is either some conflicting setting somewhere, or the issue lies with connecting via a MK3-USB, since this is an obvious difference to the real Cerbo.


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sum1youno avatar image sum1youno ejrossouw commented ·
The only other difference I can think of is that the system previously had a VE.Bus BMS v1. I wonder if something about this is lingering in the memory of the Multiplus or Venus OS (I haven't tried factory resetting the Venus OS, since I don't want to lose the history)?
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