In 2015, I installed 6KW worth of solar panels on my south facing roof. I did not install a battery because at the time it was very expensive for the amount of storage. In 2018, I installed a 12KW heat pump so my demand on electricity had increased significantly above what my panels could supply (particularly in winter) meaning fluctuations in electricity unit prices had an increased impact. Battery price vs storage have dramatically improved since then, so in 2022, I purchased my first Tesla Powerwall. I was very impressed with the technology however it was a big investment and I wanted to make sure I realised the full potential from my Powerwall in order to make the quickest return on my investment (particually with the fact there are numerous YouTube videos stating you can never make the price of a powerwall back).

Moving forward a year, I have now purchased my second powerwall because I believe the economics of owning a powerwall make financial sense when properly managed. I initially developed a very simple way of programming the powerwall to take advantage of off-peak electricity pricing. I have now developed a more sophisticated program that manages the powerwall automatically for me on a day-to-day basis. With tariffs like the agile tariff from Octopus Energy, where energy prices are linked to wholesale prices and vary every 30 minutes. Prices even go negative on this tariff meaning you get paid to use electicity. Having an automated program to constantly monitor the electricity price and my available stored electricity becomes incredibly powerful

This website I created will give you the opportunity to use my program to make the most from your own powerwall, whether you have a tariff like agile or a standard day and night rate tariff. It also will show you very clearly your grid/battery/solar usage, the benefit you have made from having the powerwall and many other useful views.

Finally, I recently brought a Tesla Model Y and another 2.5KW of solar panels, further increasing my dependency on electricity. My program yet doesnt manage the interaction with the car but I fully expect to develop connections with the car to automatically charge when excess solar is avaliable and the battery doesnt need it.