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 Wallbox 2
kfz-tech.de/YeD12
So far we have been of the opinion that you don't need a wallbox. However, if there are people who hate too many hassles around their electric car and are prepared to spend the money for it, e.g. at VW currently 400 euros
plus installation service, then they are hereby excused. Everyone else is referred to the video above. Hopefully we will keep the link to it for a long time. However, you could still read on and understand it.
An electronics engineer has built his own wall box, which gives us the opportunity to find out what is actually needed for such a project. However, he himself initially describes the largest component, a display unit for all
possible charging parameters, as superfluous. There still remains his three-phase switching unit and, particularly important, the charging electronics. But we will first deal with the switch.
In principle, this is already present in the meter box if a high-voltage line with a corresponding socket comes out of it. If not, then you can do everything right straight away. Of course, we must point out that installations in the
meter box are the responsibility of appropriately qualified specialists. The next hurdle for high-voltage power that has already been installed is the so-called residual current device (RCD).
The purpose of such a circuit breaker is to measure the current against earth or, for example, against the metal casing of electrical devices and to switch it off before it could become dangerous for people. Even as a
layperson, you have a good chance of recognizing whether the high voltage current is only protected by three phases or is also equipped with such a circuit breaker. It is also available as a combination switch (RCBO),
sometimes also referred to as LS/FI. It became mandatory more than ten years ago.
It is best not to worry about any existing protection of continuance, but to ensure that you retrofit it if it is not already there. We only found three individual Fis for 15 euros each, but they are also available as a combination. If
your high voltage power needs to be reinstalled, you will choose the combination anyway. Now we can first establish that the supply line is in place, assuming that there are appropriate plugs to the power source and the car.
It is also important that it can be used variably, because you could, for example, charge it while you are at work, even with up to three times 32 A, if your electric car allows it. Yes, the plugs are the problem for now. Less so
the plugs for the power source, because these cost around 2 euros plus shipping, regardless of whether they are 16 or 32 A. However, we only found a type 2 plug for the car with difficulty for just under 50 euros. Either there
are still too few electric cars, or the prices are being kept artificially high.
At least the type 2 plug has the advantage of being able to accommodate the charging electronics. Our electronics engineer chose a larger circuit board with components that costs around 70 euros (video below). But we
also found smaller ones for around 50 euros that actually fit. For the charging cable, five x 2.5 mm3 should be sufficient at 16 A. But you can now either add a second cable with 32 A or a corresponding adapter.
| Without a charging brick, the cable also requires less storage space. |
Now you're fine. You charge alternating current wherever possible and, if necessary, save the complex home installation with an extension cable for high voltage. If you dare or have professional help to unscrew and re-screw
the plug, you can even lay it firmly and through walls. After all, you would have to pay around 650 euros for a ready-made cable set with various plugs. The high voltage installation would then be added on top.
kfz-tech.de/YeD13
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