Dala, thanks for posting this. I can 100% appreciate the interest in the live data as I do something similar with my solar pool automation. It's pretty amazing once you realise how much energy is actually present in a square metre of solar exposure! I calculate live BTU measurements from my system (the system generates up to 100K BTU) based on actual flow and live input/output data as well as post a few data points from my SmarthThings hub, via hundredgraphs. I look forward to updates on your system as to how many kWh you are pumping out
Is the system based on microinverters, or is this a string system?
Here is live data from my pool automation system. You need to click the "All" button on the page to view the data...
So what are you planning to use for the powerwall? I'd take a wild guess and say LEAF battery..ha.