Describe the bug
The numbers reported in the "electricity to/from battery" output are sometimes in DC numbers (a DC connected battery charging) and sometimes in AC numbers (AC battery, DC battery discharging)

To Reproduce
Steps to reproduce the behavior:

1. Run a DC connected battery case
2. Compare PV DC gross numbers to battery charging
3. Compare to grid and AC output numbers to battery discharging

Expected behavior
Numbers in this output field should be more consistent and easily explainable to users.

Leaving this issue without a milestone while we define conventions.