The previous chapter dealt with loading at home, in principle in the safe garage, but possible on a lockable box in the driveway. As you can see from the picture here, only the box can be secured, but not the supply cable. It is exposed to vandalism.

A little anecdote: At some point I had switched from the car as a means of transport for work to the train, but needed a bicycle to get to my place of work. Most of the time it went well, even over the weekend. Just when I had the colleagues to a further training to guest on a Monday, the tyres were flat and the valves away.

This is perhaps typical of solutions such as the one shown above. It usually works well, but exactly when you need functioning technology most urgently, it is not available. It doesn't help much if the mobile phone tells me in the middle of the night that there's something wrong with the power supply.

So and now something fundamental, which is not really often noticed: Batteries do not feel comfortable at all if they are always fully charged. So if you always bring your electric car into the state of highest readiness, then the battery life decreases. All in all, it has lasted quite a long time, but it takes revenge with less and less capacity.

Experts therefore suggest a scenario in which every possibility of partial charging is used. This could then be a supermarket or DIY store with loading columns at the parking lots. It's astonishing that this new electrical world fits perfectly into the everyday life of an average person, but not into that of a salesman or holidaymaker several times a year. At least not if he wants to go by car.

May be, as a consequence, much more people will take the aeroplane in the e-future and the child will be poured out with the bath water. Also the enormous acceleration despite high weight is a plus point for the short distance. If you drive longer, a high average would make more sense than the ability to spurt, because this promotes the range problem. The industry, especially the one responsible for automobiles, naturally has an answer for everything and that is 'quick charging'. If, however, you ask experts in electrical engineering again, they are very sceptical. Their first counter-argument is again the service life of the batteries, which drops to about half if they are constantly charged quickly.

It is not for nothing that to each Tesla is given a kind of recording agenda. Even after hundreds of thousands of kilometres, you can still read how often the battery has been quickly charged. If not manipulated, this is by the way a great possibility not to be tricked when buying a used Tesla model.

But there are other reasons to be against fast charging. But one after the other. In the previous chapter we assumed 40 kWh. If you follow newer plans, the lower limit rises to 48 kWh and reaches a maximum of 110 kWh. You will suspect that even the best house system will hardly follow in a reasonable time. But the market demands more range.

Now, however, you cannot combine a battery weighing tons with a motor that is too weak. On the contrary, since this is a premium product, it must of course be particularly sporty. And how do you solve this dilemma? Quite simple: First the voltage is drastically increased to e.g. 800 volts and then the charging is reduced to utopian low time values.

You won't believe me, but apparently Porsche claims to implement 400 km in 19 minutes. No, not 20, 19 minutes, the announcements are suddenly so exact. Now we do not want to assume 400 km at crawl speed. You will probably live up to the brand, if you assume at least 30 kWh per 100 km. Based on the current driving profile of this brand and the corresponding increase in weight, it would have to be much more.

So 30 kWh at 100 km results in 120 kWh at 400 km. Ouch. More than 360 kWh, that doesn't work. So Porsche assumed a slow speed of 20 kWh. So you get to know the brand from a completely new perspective. We have to calculate with 80 kWh in 19 minutes. We take nevertheless with '3' times and receive proud 240 kWh. Just for your orientation: A Tesla Supercharger only achieves 125 kWh.

By the way, if there are up to eight of these at one location, then only four guarantee the full loading capacity. And then you'd like to see how it works at full capacity. Tesla would be trustworthy, they have it and now more than one Porsche is coming and demands 240 kW. So far this has probably worked because it is charged at a special charging station in the factory. But the company IONITY, founded jointly by Porsche, BMW, Daimler and Ford Europe, is going one better and even talks about 'up to 350 kW charging power'. In the previous chapters we have assumed a maximum of 11 kW per vehicle and had warned of peaks. Even at 240 kW we have to assume that 21 cars will be fully charged at the same time and that creates problems.

Please do not forget that the cable cross section also depends on the current strength. A high voltage is favourable here, but even at 800 volts, 300 amperes of electricity flow at 240,000 watts. According to the table, 300 A require a cross-section of almost 100 mm², i.e. 10 x 10 mm. For outgoing and return lines and the density of copper, a 3 metre long cable with corresponding insulation and cross-sections at the plug weighs almost as much as a full bucket of water. Will the Porsche return to its old days and become a men's vehicle? Or will industry fool us? After all, IONITY promises another 50 percent more loading capacity. And here not, as with Tesla or at home, the performance of more than one vehicle is throttled because it is always one and the same vehicle. And that's something even a network can hardly do. let alone more vehicles meet.

They might still find a way. You suspect it, it will be complicated and very expensive. Then the charging station has the appropriate battery capacity and Porsche drivers are probably here for this loading capacity will have to pay a special fee. The general public will probably not be able to expect such a thing. However, not all charging stations are covered either. And the Porsche driver is still not served, because he/she creates the announced 400 km only with very moderate driving style with 20 kWh/100km consumption.