Consideration of charging the home battery at night to increase cost accuracy

[ptar]

Initially suggested in the TSC forum thread (German)

If the battery is charged at night (in winter), the grid or spot price must be assumed (and of course the loss described in #1656), not the PV price.

It should be sufficient for TSC to track the charging of the home battery in the same way as the charging of the Tesla battery. In my opinion, this should result in a relatively good price determination for the electricity from the house battery. The TSC could then use the current price for electricity from the home battery to charge the Tesla.

I can think of two simplifications that might make implementation easier:

• For the cost, there is only a distinction between
  • Charging at night (sunset to sunrise) with grid price or spot price
  • and during the day (sunrise to sunset) with the PV price.
• The underlying home battery charging processes are only taken into account for a few days, e.g. a week.