Area graph with zero in the middle

Hello guys,

I’m looking for a panel do display my energy consumption over time.
I have 2 values:

  • injected power
  • consumed power

I want to display the in a way the the zero is in the middle, the injected is above the zero, and the consumed is below the zero. Now I do it by multiplying the consumed power by -1, but this screws up the min/max values in the legend.

Is there another way to fix this (or is there a better solution anyway…)