include charging rate profile when charging bus batteries

[nickolasclarke]

Currently we use a fixed charge rate (default of 150 kw) regardless of the battery State of Charge (SoC). This does not match reality and will give us inflated charge values.

[r-barnes]

@nickolasclarke : Is there a simple equation that could be used to approximate the charge profile?

[nickolasclarke]

I'll do some sleuthing. I suspect there is.