I just used the WAG (3 cent delta) price for three reasons:
- The one way losses are already factored into the storage costs (ie what you put in is not what is stored)
- The loss as a $ standpoint is sort of weird since it's really a kWh loss but I see what you are doing with TOU.
- I witnessed my small delta causing the change I needed. It may not be highly accurate (see the discussions on the Impact value), but operationally it seems to do the trick.
BTW since I did create these offset prices I have seen a greater push to use solar during peak to offset the house load (Export Everything) where before (with Export Solar) it would drive just filling up the PWs first and then when it hit peak, rely on PW energy only. Still a lot to learn by both me and my system in this area.
On another note I got my True Up for the last year and it was only around $200. The reason is we had no downstairs AC during 4 months of the summer and I basically drove 4k less miles. Since we upgraded the heap pumps to more efficient units I am going to have to do some deep calculations to figure out how to set all of this so I don't run into over crediting my account $-wise. I won't over produce for sure.