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I have a victron smart solar with VEdirect to USB cable.  I found a script that is supposed to be used on the Raspberry but I am completely new to this system and cannot figure out how to integrate it.  I would like to use it for remote monitoring of battery state. There are several alternatives listed in Victron Open source page.
https://github.com/SignalK/vedirect-serial-usb
I am interested in this also -I have smart solar mppt and bmv712 battery monitor (which can use bluetooth) but using a direct cable to a MFD with openplotter would be excellent for many cases.
https://www.victronenergy.com/blog/2019/...-signal-k/

https://www.victronenergy.com/live/open_source:start

https://www.victronenergy.com/blog/2018/...on-energy/

https://community.victronenergy.com/ques...ignal.html

it tells how in the link you posted.
installation

Use the Signal K app store or install via NPM in the Signal K server root directory: npm install @signalk/vedirect-serial-usb
Usage

Set up the appropiate device on the settings page of this plugin in the Signal K server admin UI, for instance to /dev/ttyUSB0 and enable the plugin. Your VE.Direct data will be available in Signal K format via various clients and apps.
I got my first panel arco m55 back in1982 and have lived off-grid on solar for over 40 years will never go back to a grid home. I recommend this blog https://websolarguide.com/am-solar-fence-charger/