Charge cost by time incorrect $2.00 vs $13.00

I have setup the charge cost to be 0.333 per minute. The cost shown for a charge is very wrong.  Real cost for a 30min charge $10.  Cost shown on site is shown as $2.30.   I assume this is some kind of setup issue.  I have per kwh set to zero.  Each tier set to 0.333.  What am I missing in my setup to have the cost for each charge calculated correctly?