Tool to assess the impact of battery storage

I've put together a simple tool to assess the impact of adding a battery ESS to my home.

In case anyone else is interested in using or improving it, please find it here:

https://github.com/hgomersall/Battery-Energy-Sim

Essentially, you can load CSV smart meter data exported from glowmarkt, add a battery, and add and adjust the tariffs to see what the impact would have been over that period on your electricity spend.

Current limitations that should be easy to fix are: (1) the raw data always uses the default price; (2) the charge rate is fixed at 3kW, the discharge rate is unbounded.

Less simple things to fix are (1) there is no facility for including solar; (2) I'd like to include gas data alongside historic temperature data and CoP data to estimate the effect of using a heat pump to replace the gas heating.