I need to calculate whether adding a batery to my solar system will save me money, and if so how much. To do this I need to know how much “spare” energy is generated by the solar PV that we are not using (that could be used to charge the battery) and how much we draw from the grid (which could potentially be supplied by the battery). If the Vue could give me Watt-hours, then I would not need second by second data, but as far as I know it does not, so I think I need the second by second data to calculate the surplus watt-hours.
How best do I do this?
If it is true that Emporia only stores the second by second data for a few hours, then I can potentially download the data every hour and thus build up the history that I need, but if possible I would like to use historical data, rather than have to wait for a wole year to build up new data.
Rowan