10 20 30 40 50 60 70 80 Weekday Weekend 12 34 56 7+ Number of Connections Per Day figure 3. A normalized histogram of the number of EV connections per day. 3 2.5 2 1.5 1 0.5 12 (a.m.) 3 2.5 2 1.5 1 0.5 12 (a.m.) 24 68 10 12 (p.m.) 2468 10 Time of Day (15-min Resolution) (b) 6-10 a.m. 3-9 p.m. 9 p.m.-6 a.m., 10 a.m.-3 p.m. figure 4. Normalized histograms of the start-charging time per EV connection (weekday). The (a) first and (b) second charging events. 68 ieee power & energy magazine 24 68 10 12 (p.m.) 2468 10 Time of Day (15-min Resolution) (a) if a second charge happened, this typically started after 6 p.m. This demonstrates that a few EVs were charged at home before and after working hours, a finding that aligns with what was reported in the social trials. During weekends, the first charge most likely started between 9 a.m. and 6 p.m., and the second charge occurred later in the evening. In the MEA project, we found no significant differences in the start-charging times among weekdays (Monday- Friday) or between Saturday and Sunday. Charging events occurring on holidays were treated as weekdays or weekends, depending on the day of the week the holiday occurred. Always Expecting a Full Battery? EV drivers are likely to plug their vehicle into the grid when their battery SOC is relatively low, and they will probably leave it plugged in until the battery is full. The MEA project found that the initial and final SOCs depend on the number of charging events and november/december 2018 Probability (%) Probability (%) Probability (%) 1.53 1.92 0.46 0.63 0.15 0.24 0.09 0.10