ᐅ Garage Electrical System: Circuit Breaker Panel, Electrical Circuits, Outlets

Then you need to have a three-phase 400V/32A supply installed for the 22 kW. However, your household connection must first support this, and the utility provider needs to agree. If that is not possible or too expensive, in my opinion, 400V/16A, which is 11 kW, is sufficient for electric mobility. You are not just at home for one hour, where your car needs to charge from 0 to 100%. It stays there longer (at least about 8 hours overnight), so 11 kW is more than enough. Especially since there are considerations in the future to charge based on actual power consumption, meaning charging will likely be done at the necessary speed rather than the maximum possible.

BigFoot schrieb:

Then you need to have a three-phase 400V/32A connection installed for the 22 kW. However, your main electrical connection must first support this, and the utility company has to approve it. If that’s not possible or too expensive, in my opinion 400V/16A, which equals 11 kW, is sufficient for electric mobility. You’re not just at home for one hour, needing to charge your car from 0 to 100%. It will be parked longer (at least about 8 hours overnight), so 11 kW is more than enough. Especially since there are considerations in the future to charge based on the required power rather than the maximum possible speed.

Thanks! I’ll take these values with me and see what the utility company says about the 32A.

I’ll join the discussion here as well... I initially neglected the topic of the electric car. Although I mentioned at the start that we wanted to prepare for it, I didn’t follow up during the construction rush. Since we don’t have a shed yet, it wasn’t really necessary at the time. The electrician just gave me a thick underground cable, which I didn’t question further. The civil engineering team laid it together with the conduit for fiber optic as part of the multi-utility duct. Now I checked, and it’s only 5 x 1.5 mm (5 x 0.06 inch). For my current needs—just 1-2 sockets and 2 lighting points in the shed—that’s more than enough. The downside is that it won’t be sufficient for an electric car charger that will likely come at some point. The multi-utility duct is already fully occupied, so eventually I won’t avoid an unsightly core drilling, and I’d rather not replace the 5 x 1.5 mm cable. I don’t want to tamper with the multi-utility duct, and high-current cables in the same duct as fiber optic aren’t good for internet performance anyway.

What cable do I need for an electric vehicle charger? 5 x 6 mm (5 x 0.24 inch) or 5 x 10 mm (5 x 0.39 inch)? I’m considering laying the cable now from the exterior wall of the utility room to the exterior wall of the shed, or even in the shed’s floor slab, before paving and building the shed next year. I’ll have to dig the trench for the 5 x 1.5 mm cable anyway, so it would be easy to do it at the same time.

pffreestyler schrieb:

High-voltage power cables in the same multi-utility conduit as fiber optics are said to negatively affect internet performance.

This has no impact on each other because fiber optics transmit data through light signals, which are not affected by other electromagnetic fields.

pffreestyler schrieb:

What type of cable do I need for an electric vehicle charging station? 5 x 6 mm² or 5 x 10 mm²?

You can’t say that in general; it depends on the length and the power output of the charger. I would recommend at least 5 x 10 mm² (5 x 0.02 inches), as the additional cost is negligible. Sometimes 5 x 16 mm² (5 x 0.03 inches) is even better because it usually has multiple strands, making it easier to install.

So we installed a 5 x 16mm2 cable based exactly on the same requirements. This should be sufficient. However, you won’t be able to charge two Teslas with Superchargers simultaneously, as your main electrical connection can’t support that at all.

gmt94 schrieb:

We used exactly the same specifications and installed a 5*16mm2 cable. That should be sufficient. However, you won’t be able to charge two Teslas with superchargers at the same time, as your main power supply can’t handle that.

It’s likely that the circuit protection from the street or residential area won’t support simultaneous fast charging for all houses with superchargers or similar setups. But fast charging at home is rarely necessary. Usually, there’s enough time to charge slowly overnight.