Energy Stats UK
Apart from the Lux software to monitor the system I have been using the following to research Octopus Agile pricing
Energy Stats is a great site for comparing Octopus Agile historically. I also publishes the daily Octopus Agile tariffs each day. The data was very helpful when I was comparing my usage to what I would have paid with Octopus Agile
In December I would have been £26.52 worse off. Saying that, it was straight comparison with no battery charging to avoid the higher slots.
In January where the battery was used I saved £24.76. So far in February I have saved £5.10, only 5 days in