2xMPPT100/20, Smart Shunt 300A, Pi4 Venus, Bluetooth Connection

Q&A and troubleshooting
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iI have 2x MPPT 100/20, 1x Smart Shunt 300A, 24v LIFEO4 2s2p.

Max PV is around 84v.
Max PW is 600W but I only get 350W per MPPT.
Each MPPT can generate up to 2.5KW per day.

Initially, I created a Bluetooth network, MPPT1 Master, MPPT2 Slave. Unfortunately, MPPT Master is limiting the total current at 20A instead of 40A for both MPPTs. Therefore, i want to use pi4 Venus DVCC instead of MPPT network. I am having little problem with USB connections. They disappear after 15 minutes.

Can I connect 2x MPPTs and a Shunt to a PI4 Venus with Bluetooth instead of USB ?

In a perfect world, I wish they all connected with wifis.

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If ypu are able to modify programming yes. There arw a few projects available on git and others with members playing with the idea.

Natively no, the venus os is designed mostly for a wired network between critical components.

The real question is why are the pi USBs going to sleep though. I have not had that issue with the one set up i do have a with a pi.
Did you use home made cables or purchased the ve direct to usb cables?

2 Likes
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Hi,
Thank you for your reply.

I can do programming and I will look at that project on git, thank you.

Yes, I used DIY cables. 3 of them. It was pretty simple to make. First I connected red cables as well for power. Same problem but in that case, they were less stable. I disconnected red power cables. They were more stable, but they are disappearing after 15 minutes or so. They are connected to a hub. Hus is not self powered. I will connect them to a self powered hub. I think when the pi4 does not see any power on the red cable, it disconnects them after a while. If I reboot the pi4 from the vrm, they all come back for a while. But I need stable connection to use DVCC and monitoring.

I will post the progress.

I wish they communicated with wifi or rj45 or at least with bluetooth. I don’t like to see too many cables.

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Yesh the home made ones are unstable. If you switch to bought ones you will find it quite stable.

Then this. Also had issues when i used hubs. Pi usually barely have a power supply big enough for itself.

I can say thta with bluetooth it is hard on the pi streaming the information. There are other problems you will discover with that method. I see why it is not implemented.

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DIY Bluetooth may not be the best option because I need reliable two way communications for DVCC.

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Diy anything is not really ideal for something critical. And wifi is also not arls reliable as wired.

The pi will work well with purchased ve direct to usb cables. I have had one in the field for years like that with no issues.