I saw online some cheap hardware ~10$ that can measure Volt, Amps, Watt and Kwh and display the results on an LCD screen.
I could buy and plug these on my 12V solar panel system to monitor it. (5 of them)
But thinking about it, I wish to use my RPI to monitor these numbers. - Trigger some events on specific values.
And display all of it in a web interface or whatever. (That won't be a problem.)
My question is : What kind of hardware can I use to simply measure the Volt, Amps, Watt and Kwh and send the value to my RPI ? (in 5 different places in the circuit.)