@wavesculptor @pvonhellermannn @skolima @davidnjoku
I can search that for you. Can you share yours ?
It comes down to three factors : power supply are usually less efficient at low loads, batteries have lower internal resistance when warm (they get warmer if charging a bit faster) and there are fixed consumptions during charging : cooling pumps and fans, onboard computer etc.
Here's one, which is dated (2014), but results won't be very different today :
https://www.energy.gov/sites/prod/files/2014/03/f13/vss096_francfort_2013_o.pdf
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