ᐅ Are home battery storage systems for electric vehicles also not cost-effective? Costs of charging station and battery storage
Created on: 11 Aug 2020 07:54
A
annab377
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
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
The idea is quite simple: you charge the car battery with 100% electricity, but due to charging and conversion losses, only about 88% remains. Then you consider using this electricity for the house, which involves another round of extraction losses. Now the car battery is empty, but you still need it fully charged for work, so there are charging and conversion losses again.
And the car battery is not free. It’s like saying the heat generated by your car heater is free. If you’ve ever seen how quickly an oven, stove, dishwasher, and hot water consume 10 kWh, you will quickly dismiss this idea.
Therefore, this bidirectional charging is just marketing talk. Sure, it works, but it doesn’t really make sense.
My electricity cost was 900€ per kWh including labor, without subsidies. With subsidies, it breaks even, which is sufficient.
And the car battery is not free. It’s like saying the heat generated by your car heater is free. If you’ve ever seen how quickly an oven, stove, dishwasher, and hot water consume 10 kWh, you will quickly dismiss this idea.
Therefore, this bidirectional charging is just marketing talk. Sure, it works, but it doesn’t really make sense.
My electricity cost was 900€ per kWh including labor, without subsidies. With subsidies, it breaks even, which is sufficient.
@Zaba12
If you can charge for free because there is currently a surplus in the grid and then use the electricity when it costs 50 cents instead of 25 cents, the charging losses don’t really matter.
Of course, it has to be intelligently controlled so that there is always enough power stored in the battery when you need to drive the car.
It must be defined in advance what the minimum charge level should be and when the full charging capacity needs to be available.
However, this kind of control is better managed externally rather than by the car itself.
If you can charge for free because there is currently a surplus in the grid and then use the electricity when it costs 50 cents instead of 25 cents, the charging losses don’t really matter.
Of course, it has to be intelligently controlled so that there is always enough power stored in the battery when you need to drive the car.
It must be defined in advance what the minimum charge level should be and when the full charging capacity needs to be available.
However, this kind of control is better managed externally rather than by the car itself.
N
nordanney12 Aug 2020 18:01Musketier schrieb:
installing a ZOE permanently instead of a battery? You mean that plastic sphere with four wheels? I prefer driving a proper car that can fit more than one driver.
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