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U/I Measurement

I am trying to make a remote DC current measurement with the Raspberry Pi connected to an USB Amp-meter. This remote Amp-meter will be used to measure the charging current of a battery set powered by a remote solar panel.

Sample Chart

I will use the Apache web server running in the Pi, to run the PHP code and serve the http requests for the DC current measurement values.
Basically I will be able to see the DC charging current values of the remote solar system from 1000`s of kms away..
Such remote Amp-meter device would costs hundreds of EURs, but can be build this ways for a portion of that cost.

The solar system is a 80W mono crystal panel and a 20A pulse charging charge controller and a 70Ah solar deep cycle AGM maintenance free battery.