Looks like it is intended to help guide grid operators (and maybe, businesses providing multi-vehicle AC charging) manage charge rates between BEVs/PHEVs.
http://avt.inel.gov/pdf/fsev/SteadyStat ... 15Leaf.pdf" onclick="window.open(this.href);return false;Key Insights from Testing
• Nissan Leaf charging is most efficient and has the best power quality
when charged at the maximum charge rate.
• When charging a 2015 Nissan Leaf, Level 2 charging should be
used instead of Level 1 charging whenever possible. Level 2 charging
is much more efficient than Level 1 charging.
• When reducing the charging of a group of 2015 Nissan Leafs,
the charge rate can be reduced to a point with minimal impact to
charging efficiency and power quality. If it is desirable to reduce the
charge rate below this point, it is better to discontinue the charging
of some vehicles to reach the charge reduction target than to
continue to charge all vehicles at a lower charge rate where both
efficiency and power quality will be negatively impacted...
Many AVTA reports on 2011-14 LEAFs available here:
http://avt.inel.gov/fsev.shtml" onclick="window.open(this.href);return false;