Thanks mainly to BB and willisave I finally got PVOutput recording and displaying my Powerwall 2 data. Now I’m trying to put on a sensible air temperature line on the live graph. I registered with OpenWeatherMap as basic data is free and got data at mostly 10 minute intervals in the table but nothing on the graph, except 2 data points which I realised were at 5 minute intervals. Finally got a line showing by changing Status Interval to 10 minutes but it’s broken where the data interval is more than 10 minutes - and I’d prefer a 5 minute interval anyway. Is there a solution to this? The OpenWeatherMap instructions suggest a minimum interval of 10 minutes.
Alternatively is there a better alternative free source? Wunderground appears to be a fully paid service, and I think you have to have a weather station.