If interested, it is possible to plug in a raspberrypi to track and post your solar energy production to the solarcoin blockchain. Will use 3-4 watts. You can also mint (POST) Solarcoin using the same raspberry pi as a full node.  more info on www.electricchain.org There is also a solarcoin telegram channel which is pretty active.

https://github.com/Scalextrix/SolarCoin-Raspberry-Pi-Node