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Solar EV Charging Load Profiles By Month

April 26, 2022

Average charging load profiles per EV for a sample of Australian Charge HQ users are presented for the period September 2022 to August 2023.

The data is based only on users who have enabled solar charging, many of whom will also top-up from the grid overnight.

The expected inverse correlation between the level of charging occurring during the day vs evening can be seen across the seasons.

Notable steps in charging load are seen at 22:00, 23:00 and 00:00 as times which users commonly set commencement of scheduled grid charging.

Looking at the average kWh of EV charging per user per day, we can see material variation from month to month. The real cause is not known, but it is suspected to be due to holiday periods altering charging patterns. This may include a mix of more charging occurring away from home and/or less distance being driven by owners while still charging at home. December, January, and April are months either wholly or partly affected by holidays.

More information about the data set:

  • More than 1000 users are included in the data set.
  • Figures presented are based on per user not per EV. The app is not currently designed to manage charging on multiple EVs but a small number of users may be doing so.
  • All values are based on energy consumed by EV charging regardless of source, which will be a mix of grid, solar and home battery.
  • The graphs display the average power consumption at 15 minute intervals. To calculate the average, we sum the power readings for EV charging for all users in the cohort for each interval and divide by the total number of users in the cohort. The user count includes any user who has charged at home during the period being considered. We only count charging at home, acknowledging that there will be a range of users who only charge at home to those who primarily charge away from home. This will affect the average.
  • Considering how the average is calculated, it may be more informative to focus on the shape of the charging profile, and the relative charging power level at different times of day, than the absolute figures presented.
  • Many of the notes and observations from the EV Charging load profiles - Winter 2022 also apply to this data set.

See also