Predheat - Display Predbat energy value, not current tariff costs

[headbouyJB]

In reviewing the Predheat Cost chart (from Apexcharts template) the costs appear to use tariff price at time of use.
This doesn't account for the 'time shift' of off-peak power from the battery, and so inflates heating costs.
Table below shows samples from Preheat charts for energy use and cost, and calculated peak and off-peak tariff costs for that energy demonstrating alignment (or nearly so).

Energy stored in the battery should be valued (grid, battery cycle cost etc) and that value reflected in Predheat costs when it's then used for heating. This will give visibility to the value the battery brings to the heating system, and the scale of any potential improvement by increasing battery size.
I've not had sufficient solar generation to know whether its contribution to heating is reflected in the cost.

[springfall2008]

The problem here is that you can't know the true cost of using energy now, but there could be a way to approximate it based on the average unit cost entities that Predbat already creates