ᐅ Are home battery storage systems for electric vehicles also not cost-effective? Costs of charging station and battery storage

Hello everyone,
I am planning a 15 kWp photovoltaic system for our single-family house and garage. Currently, without an energy storage system, since according to the latest information, it is still not economically viable. It is often advised against for that reason. Does this apply only to normal household use, or would it be different if you have an electric car?
I have a relatively long commute of 80–90 km (50–56 miles), so I’m considering leasing an electric car.
For that, of course, I would need a wallbox (as the interface between the energy storage system and the car) and an energy storage system. It does sound interesting because I could save a few thousand euros on diesel, and energy storage systems and electric cars are currently subsidized as well.
What additional costs should I expect? According to ADAC, a wallbox with 11 kW charging capacity costs about 500 EUR (e.g., HEIDELBERG Wallbox Home Eco). Accordingly, I would also need an energy storage system with a somewhat larger capacity. With an electric car (e.g., VW ID.3, but no Tesla), the payback period should be significantly shorter, right?
Let me know what you think.
Best regards

Wallbox yes – in many federal states it is available almost for free.
I am (still) not convinced about the energy storage. In my opinion, the price-performance ratio is not reasonable yet, despite subsidies. Calculate what you save. Keep in mind, self-consumption must also be taxed!

So, should I just use the wallbox alone? Then the car would always need to be connected whenever the solar panels are generating the most electricity, right?

Hmm, that could be a problem if the sun doesn’t shine on Saturday and Sunday, because from Monday to Friday I’m at work during the day, and unfortunately, there are no charging stations available then.

In the facility, the evening hours are more than enough for you. If you can plug in at 5 p.m., the car will still charge for 4 hours.

annab377 schrieb:

Hmm, this could be a problem if the sun doesn’t shine on Saturday and Sunday, because from Monday to Friday I’m at work during the day and unfortunately there are no charging stations there.

If you’re using a “real” electric car anyway, you don’t need to charge every day. For example, an ID3 with a 58 kWh battery – you only draw about 8 kWh from the storage. What about the rest?
And if you had to charge every day, you would need a lot of sun. Six hours of full power to charge the ID3.
Or do you want to buy several storage units that end up costing more than the car?
If you’re thinking about a hybrid (the GLC 300de is a great car as a diesel hybrid), then the storage is enough for one tank fill. But even then, one hour of sun would be enough.

How does battery management work in fully electric cars?

You probably should never fully drain the battery. But if I plug the car into the charging station every day and charge a bit more in the late afternoon using solar power, is that good for the battery? I’m referring to this frequent short top-up charging. That’s why I initially thought of having a battery storage system that’s fully charged over the weekend and then charges the electric car in one go. But it seems like a regular charging station with “live power” is sufficient.