Multiple charging periods per session

[robogeek]

Reading the Session data collection, isn't there a possibility of multiple periods of charging per session?

The specification says a charging session begins when the cord is plugged in, and ends when the plug is removed. It is possible to turn the charging station on and off multiple times between those two points in time. This is alluded to in the discussion of the charging_duration field.

This suggests there should be a field containing an array of

• charge_start
• charge_end
• duration

Maybe some other fields like energy_kwh, peak_kw, fee_charged, and energy_fee could be in this array.

Then, existing fields would be an aggregation of the values in the detailed array.

[jamesdifilippo]

Thank you for your input!

While we agree that a session might include multiple charging periods, because the intent of the session reporting specification is to provide reporting and compliance information that is easily consumable by a regulator or program administrator, we have chosen to simplify by requiring aggregated single-session metrics for the session reporting table. EVSPs and other charging data providers are responsible for aggregating the sub-session information they collect into session-level reporting metrics, including summing individual charging period durations into an overall charging duration metric.

A standard for collecting sub-session energy and power use metrics (interval data) is a planned extension to this specification.