2.2%! That's pretty significant. Very interesting!jashev - good question.
Earlier this year was, I part of a data logging trial for 3 months, a study done by FleetCarma. On my 2012 Volt, here's what I observed:
Miles driven: 4,863
Electric %: 100%
Total charge events: 269
Level 1 charges (120V): 78
Level 2 charges (240V): 191
Total energy (kWh): 1,242
Total charger loss (kWh): 160 (12.9%)
Level 1 energy (kWh): 385.8
Level 1 charger loss (kWh): 55.68 (14.4%)
Level 2 energy (kWh): 856
Level 2 charger loss (kWh): 104.1 (12.2%)
Even more impressive. Since I am pretty much retired, I also find it convenient to be able to run around in the morning, get home and charge, then have full range again in the afternoon.jashev,
I diced my data some more. For L2 charging events greater than 2.0 kWh (119 events), charger loss averaged 12.1%.
Similarly, L1 charging events greater than 2.0 kWh (56 events), charger loss averaged 14.6%.