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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.
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I remember feeling a bit overwhelmed when I used a Pi for a small home project. My approach was to take it step by step, beginning with simple Pi tutorials, then gradually working up to the script I needed.
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Should be simple enough if you are already running openplotter: plug the VE direct into the RPI running signalk. Go to the SK app store and install the vedirect-serial-usb plug in and reboot. Then go into plugin settings, activate the plug in and set it up. Should be very straight forward.
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As you normaly have a lot of Voltage going into SolarControllers (>50V) be carefull in using
only opto isolated VE-Direct Cables. Of course it is easy to connect the devices directly with cheap cables,
some spray water or moisture could destroy your pi and more.
ym2c - Holger