Is energy storage also unprofitable for electric cars? Costs of wallbox + storage

Well, it’s not really futuristic anymore. Nowadays, everything works without problems, meaning you can just charge from the surplus of your own roof, etc., but hardly anyone wants to pay for the technology. Basically: Why bother, it works like this too... I can just go outside and plug or unplug the car if I want.

What most people put on their roofs is 9.9 kWp, meaning that even with perfect south orientation and a Type 2 wallbox, you can’t even get 11 kWh at 12 o’clock (which really only means fast charging in marketing speak). The current vehicles now have a 40 kW battery. In reality, you can definitely fully charge 2 vehicles on a summer Sunday. During the week, you can forget about that. For example, with 40 km one way, you will have to charge starting Wednesday, which you can’t do without grid access since you only get home from 5 to 6 p.m. There is no realistically usable case without the storage or photovoltaic system being oversized so that you can charge without grid access, especially not in autumn or winter. This doesn’t mean that an electric car isn’t cheap to maintain; it definitely is, but under normal conditions, you have to let go of the idea of being able to charge the electric car with your own electricity. Although corona, regarding working from home at least in summer (May–September), gave me a charging window during the week.

Using the vehicle as storage (in the sense of a home battery) is the most nonsensical thing ever. Here, the charging losses and extraction losses are significantly higher than with a home battery.

Well, it's not that much futuristic stuff anymore. Nowadays, everything works fine without problems, meaning you can charge only from the surplus of your own roof, etc. It's just that hardly anyone wants to pay for the technology. Basically: Why bother, it works fine like this anyway... I can also go outside and connect or disconnect the car whenever I want.

For example, that's how I do it. It's no big deal. It's no different than telling the wife to only start the washing machine, dryer, stove, and oven after 10 a.m. and to largely avoid major power consumers after 6 p.m. And honestly, that's not even a radical idea or action. Because if you ignore this type of optimization regarding power consumption, the solar technician's bill won't pay off after 11-13 years.

Yes, of course, that's what I mean. You can discipline yourself and then do many things by hand. It works...

And it also works fully automatically. The technology has been available for a long time.

What most people put on their roof is 9.9 kWp, meaning that with a perfect south orientation and a Type 2 wallbox, you can’t even reach 11 kWh at 12 o’clock (which really only means fast charging in marketing speak).

Are there still kWp limits that make sense or don’t make sense? Why only 9.99 kWp when 15 or even more kWp can fit on the east-south-west roofs? Should I perhaps also only install 9.99 kWp or what? (As far as I know, there is the 30 kWp limit, but that will probably be difficult for most usual single-family houses)

I already see that selling my nearly 3.5-year-old car now and leasing an electric car might not be the right time yet. Maybe in 3-5 years, when there have been changes in the storage or also photovoltaic-capable wallbox market. Or if politics changes something regarding taxes on self-consumption?

Using the vehicle as storage (in the sense of a home storage system) is the most nonsensical thing ever. Here, the charging losses and discharge losses are significantly higher than with a home storage system.

I don't see it that way. The storage in the vehicle is free, your home storage system costs at least 1000 euros per kWh. That would be 30,000 to 80,000 euros in storage costs for most cars! Where are the big losses here, and we don't even need to talk about the investment in your battery. Since many people work from home and part-time, at least one car is almost always at home. I find it one of the most interesting developments currently.