To avoid the risk of continued stalling before reaching perfection 
I’ve merged the new MySolarPVBattery app into master and stable 
It’s now called MyElectricFlow thanks @Timbones !
and it now integrated the tariff explorer in the same app - so as to reuse the same feed configuration and provide easy switching between energy and cost views for the same time window.
This is now included in v3.3.0 app module stable release: Release 3.3.0 · emoncms/app · GitHub.
The original mysolarpvbattery app and octopus/tariff explorer are still available for backwards compatibility in the short term.
Next steps
- Add option to select different export tariffs.
- Add a custom tariff schedule builder to enable creation simple time of use tariffs.
- Place the older apps in an app archive section, e.g when you go to add a new app, it doesn’t show the older apps by default but provides an option to expand to show the older archived apps if useful for comparison/testing in the short term.
- Update Solar PV documentation to use the new MyElectricFlow app.
- Update Emoncms.org to use this and the latest changes to Emoncms core as well.
I will then come back to the more fundamental questions of how best to present the data that your exploring above @Timbones and further developments such as multiple SOC lines and other load types. Cheers all!