How much Grid Energy Does it take to Charge a Taycan with Porsche Charger?

[Scandinavian]

In my installation the wall box app reports 500W more being supplied than the Taycan reports as charging, 7.2 supplied and 6.7 charging on the Taycan display or 2.6 supplied and 2.1 charging.
I was expecting it to be less in summer but it has been the same from December to July.
It means slower charging is more wasteful since you are paying for the 0.5kw overhead for more hours.

Is your thoughts that the difference, summer vs winter, would be related to the initial battery temperature? Since all other resistance losses in electronics and cables probably would be the same?

Battery temperature probably only has a very small to none, influence on charging with AC at 7.2 kW. In arctic minus 20 degrees you would likely see more variations, than in normal UK weather?? If I remember correctly temperatures below freezing are not good for lithium batteries?

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