@lostOzone - I used a separate circuit with its own Utility Meter, so I know there wasn’t any other usage. What do you mean by ‘DIM counter’ ?
I’ve charged the car yesterday for 3 hours and 10 minutes at 6A (4,2 kW) = ±13,5 kWh.
the added energy reported by the Wallbox shows 13,5 kWh.
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I meant the MID meter used to invoice. I’ve installed one to calculate the real loss during the charges. From the Wallbox website:
What is an MID Meter?
An MID (Measuring Instruments Directive) Meter is a certified power meter that records the energy consumption of your Wallbox charger installation with high accuracy. Complying with the MID standard, it provides precise energy readings, ensuring that you can use this data for billing or reimbursement purposes.
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@Krivatri - Looks like your Wallbox is a lot more accurate than mine. When charging @ 6A, mine says 1.2kW (single phase) whereas it should say 1.4kW. It has always read significantly on the low side.
I’m not too worried about it because nobody pays me for energy used in charging my EV. It would be different if I had an employer or someone else who needed accurate invoices as @lostOzone does. Then it would make sense to install an MID meter.
Most of my energy comes from solar (especially during summer), so I can’t complain about that 
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do you have a power boost meter installed?
I have one installed, maybe the Wallbox gets the values from this device, but I’m not sure.
No, I don’t have a Power Boost meter installed. Maybe that’s the reason, as you say.
My Wallbox also gives a very poor measurement of the charging power. I know because I have a calibrated power meter connected to it for use in HA.
I also have a Power Boost meter connected. That however does NOT give the Wallbox a charging power/energy reading. The Power Boost meter measures the whole house current so the Wallbox can protect the main fuse. In my case that is helpful because I only have a 50A single phase mains connection. The Power Boost function is really a power limit function. The Wallbox will constrain the charging to keep the total current well below 50A. Works a charm when charging, cooking and washing f.i.
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