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Hi,
The BMW 712 is very useful for state of charge estimation and instantaneous current/voltage readings. Would it also be possible to add full time series (e.g. minute resolution?) plotting of voltage/current/charge to the app which would be really useful for diagnosing specific issues?
Thanks very much,
Tom
Hi @t0mb0,
have you seen VRM?
https://vrm.victronenergy.com/
You need a Venus Device for the data to be transmitted there.
Regards,
Markus
I was asking about the BMV because it's already installed and it would be really neat additional functionality given it must already measure all the required parameters - just a case of recording and plotting them.
You can even install Venus on a Raspberry Pi. Easy and cheap solution to transfer data to VRM. Even with a smartphone created Hotspot in a small camper ;o)
Have a look at:
raspberry-pi-running-victrons-venus-firmware
Regards,
Markus
Ah, I see! Thanks very much, that's interesting.
Having a quick look at the VE Direct protocol, it's clear the BMV unit doesn't store history itself, which is a shame, so an external unit (e.g. raspberry pi) would definitely have to do the logging. Definitely possible, but a fairly major project! I'll let you know how I get on if I give it a go.
I am embarking on a similar path and are also looking for 'local' logging as we are a yacht and frequently not within GSM coverage to upload to VRM but still want the logging available - perhaps operationally even more important off line if there is a problem in a remote location. Have the RPi in the 'planning' but as you say a different problem and do not want this device to be 'in-line' with operational equipment if at all possible.
This logs every minute locally and displays ii beautifully in various and adjustable grafana graphs. Runs on a pi and works for BMV, Solarchargecontrollers and Phoenix inverters. Way more possibilities with remote this and that too. Needs VE to bluetooth cable, a pi, and a screen which can be an existing TV
