Interpretation of power demand in garage and wall boxes

Good morning!

What capacity and cable size are you installing in your garage? My provider regularly installs 63A and 30KW capacity for the house. Every additional KW costs 95,- net.

Since surely in a few years 2x electric cars will be added, this must be taken into account. Currently, I am debating between 11KW per wallbox and 22KW. In the second case, the total 30KW capacity would of course no longer be sufficient.
Cable cross-section will probably be NYY 5x16mm2.

What have you planned or implemented?

Well, I have an old building, but I can tell you that the energy provider has to approve heavy consumers. For example, we have 2 instantaneous water heaters with 20 kW each, and that is already "forbidden" in the sense that only one is allowed to run at a time. The other is deactivated during this time by a load shedding relay. And that's even though the instantaneous water heater uses only about 5 kW while showering. But still!

So simply installing 2 wallboxes with 22 kW each is not possible. Depending on the energy provider, only 11 kW may be allowed.

By the way, we have no wallbox and 2 electric vehicles.
One charges at just 2 kW from the socket anyway, and the other could do 22 kW but also charges temporarily from the normal socket. Especially during the day when the sun is shining (and the photovoltaic system is running).

For the near future, a mobile 11 kW charging solution is planned. So no wallbox but an adapter like the go-eCharger. We already have a CEE red 16A three-phase socket here at the house. It would then have to be extended 30m to the garage. Then several electric cars can be charged there, just not simultaneously.

Since ours with the small battery (22 kWh) recharges fast enough even at household sockets, it’s not such a priority.
It’s more important to me that I can throttle the charger down to 6 kW to ensure that our photovoltaic system can cover the demand.

I would not install two wallboxes for 2 electric cars. We have one electric car and one wallbox. When the second electric car arrives, it will remain with one wallbox. The cars are not plugged into the power all day (especially not if they can be charged with 22 kW). Our E3DC wallbox could also charge two cars simultaneously, one with 22 kW and one with 3.7 kW or so.

I wouldn’t install two wallboxes for 2 electric cars. We have one electric car and one wallbox. When the second electric car arrives, we will stick with one wallbox. The cars aren’t plugged in all day anyway (especially not when they can be charged with 22 kW). Our E3DC wallbox could also charge two cars at the same time, one with 22 kW and one with 3.7 kW or so.

And the cable reaches all the way over to the other side once?

I believe we have a 7 meter cable. Double garage, the wallbox is in the middle.

We have 16A and 32A in the garage. That should be more than enough. Although I wouldn't let such an electric car into the house in the first place. No desire for emotionless lithium bombs that are produced through child labor under the worst conditions. My health is also important to me, and I don't wear tin foil hats.