Memory enable more than 80 percent of its own solar power in the E-car

Memory enable more than 80 percent of its own solar power in the E-car-enable

The electromobility is directly connected to the operation of private charging stations, as a recent examination of EUPD Research shows. With solar power from your own house roof, the additional electricity requirement of an electric car can be covered ecologically and cost-effectively. The stationary power storage is mainly contributing to the integration of the solar power. For an average driving profile with 2500 kWh power consumption, a 7 kWp solar system with a corresponding home memory is sufficient to load the electric vehicle to a good 80 percent with its own solar power. Depending on the system configuration, photovoltaic and home memory can save more than 50 percent of charging costs compared to the budgetary electricity price, the market research and consulting company in a recent communication.

In addition to the steadily growing supply of full and partially electrical vehicles, electromobility requires in particular an adequate charging infrastructure. Despite a strong increase in charging stations in public space, its own charging station is clearly in focus for the future E motorist. This shows a current survey of the Bonn consulting house eupd Research among good 500 homeowners in Germany. The examination on behalf of the power storage specialist E3 / DC discloses that for three quarters of respondents the local charging station has the top priority. With a clear distance and only six percent of the answers, the range of charging options is preferred when shopping. For five resp. Four percent of the survey group remains the classic gas station on the highway or in the city of the most important place for a charging station. Only for three percent of the householders surveyed is the shop in the workplace most important.

With the installation of the Native Wallbox, the question arises which current is to be loaded via the charging station in the electric car. Currently there are good 100 energy suppliers in Germany specific car power rates. With such a current tariff, an average driver can save about 110 euros per year compared to the normal household stream. With its own photovoltaic system in combination with a home memory, the option to load locally generated ecostrom directly from your own house roof to the battery of the electric car. In addition to the ecological advantage, there is also a significant cost savings potential compared to the relation to the grid. However, the use of its own solar power for electromobility is associated with challenges. The supply of solar energy fluctuating in the course of the day and seasonally fluctuating solar energy must be brought into reconciliation with the loading requirement of the electric car.

Assuming that the e-car is connected on weekdays from 17:00 clock, Saturdays in the afternoon and Sundays in the morning on the charging station, a photovoltaic system with seven kilowatts of installed performance over the year can cover 39 percent of electricity requirements through direct self-consumption. Supplemented by a home memory with seven kilowatt hours net capacity, the annual solar coverage doubles to 81 percent, so EUPD Research.
Memory enable more than 80 percent of its own solar power in the E-car-powerEupD Research

Of course, depending on the driving profile, the electricity requirement for the electric car changes. A little driver with 5000 km driving performance and a electricity supplies for the 900 kWh electromobile can already drive with a 6 kWp PV system in combination with a 6 kWh memory 80 percent of the year with solar power. With rising driving performance increases according to the power requirement, so that the average driver can already realize 81 percent solar coverage with 7 kWp photovoltaics and 7 kWh storage capacity for electric driving of 2500 kWh. For a multi-rider with 5000 kWh electricity requirements, a 12 kWp PV system with appropriate storage dimensioning is required to be able to load at least 80 percent solar power in the annual average analogous to the other driving profiles.

“In the course of the year, it can be clearly seen that the home tank is essential in the winter half-year to save the self-produced solar power for use in the electric car between”, adds Dr. Martin Ammon, Managing Director of the EupD Research The results of the examination.

In addition to the goal of the highest possible PV self-consumption share on the charging current, the charging costs are also the focus of the analysis of EUPD Research. For the owner of an electric car with an average driving profile and corresponding to 2500 kWh annual consumption, the charging costs of the electric car with a 7 kWp PV system and a 7 kWh home tender are already reduced by 42 percent compared to the current household electricity price of 31.9 EuroCent ever Kilowatt hour.

Memory enable more than 80 percent of its own solar power in the E-car-memoryEupD Research

With a 10 kWp PV system and a corresponding memory system, up to 52 percent of charging costs can be saved. This corresponds to a average driver with 2500 kWh charging current consumption alone in 2021 already 415 euros in savings. Due to the further increase in electricity prices and the simultaneous reduction of solar electricity stations, the savings of the customer will continue to increase in the case of charging costs in the future.

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8 thoughts on “Memory enable more than 80 percent of its own solar power in the E-car”

  1. Electricity from the speaker costs but more than directly from the sun. Ideally, you will be charging when the sun is full. Thanks to home office, this should be possible in the future more frequently. Then you can simply get a small store just for the needs of the house. A store is expensive, in winter empty and full in summer. Then rather put the money in more PV modules and tend as long as possible from the sun. The battery from the car is paid before and is available for the surplus.


  2. We have 15.8kWp on the roof, 22kWh BYD memory, intelligent, PV led cargo for 2 cars with together 120kWh battery, PV-led hot water production and everything optimized on own consumption, even washing machine and dishwasher are integrated here.

    In winter, just so much from the roof to cover the house requirement, memory is rarely loaded over 40%, clear from March we sell several MWh monthly to the energy community, but in winter electricity must be bought for cars and heat pump from hydroelectric power plant and These are significantly more than 35% in the annual means ..

  3. With us since March 2020 9.6 kWp on the roof (SMA) and 7.68 kWh battery storage (BYD) in the basement. In the garage are 100 kWh car battery with approx. 12-15K annual driving performance. The Wallbox is a Go-e Charger Home+.

    I connected the PV system and the wallbox with a Raspi.
    The Wallbox has the great advantage that there is an excellently documented software interface. The SMA plant was a bit more difficult to bind, but it worked.

    The software (in-house development) on the Raspi invites the car when enough electricity comes from the roof and ensures that at sunset of battery storage in the basement is 100% filled to supply the house overnight. Of course this does not work in the winter months.

    We do not dine on the net and thus save us all the bureaucracy around this topic, with a theoretical feed-in tariff of approx. 200 € annually.

    From March 2020 to Feb 2021, the numbers look like this:
    Total consumption: 12369 kWh

    This is divided as follows:
    Network cover: 5102 kWh (41.25%)
    Battery discharge: 1867 kWh (15.01%)
    Direct Consumption: 5410 kWh (43.74%)

    At the current electricity price of € 0.29 per kWh (certified green electricity) results in a return of just under 9%. Rising energy prices improve the result in the future.

  4. The examination on behalf of the power storage specialist E3 / DC discloses,

    What the client wants. However, if you pay off, it comes out that a store does not save costs and also consumes energy (about 20% loss). A maximum occupancy of the roof is usually profitable!

  5. The thing is interesting Only when citizens and employers are allowed to sell their PV electricity via simple wallboxes and rich simple electricity meters for billing. The state can yes the 19% VAT. collect.

    Special liability insurance or. An extension covers the risks of PV electricity sale.

    The workers load During working hours, their e-cars and supply their homes and apartments with the electricity from the E-car, then citizens without PV plant would come to favorable green electricity.

    PV plant operator could take over the power supply as a village or urban energy community. The previous fossil power generators, then as state enterprises, would only fill the gaps.

    Houses and flats would be supplied with warmth of electric geothermal pumps in winter with warmth and in the summer, so that even in times of climate change the rooms in summer remain pleasantly cool.

    Gas or petroleum would only need the large corporations and then as “environmental tubs” or they look, which they too make as much as possible about green electricity – for the image and the environment.

    A dream? – He could be true if there were no electricity companies and their lobby.

  6. The simple question: Why can a car not weigh 399 kilos or less and why
    Are not enough 12-15 kW power?*
    My 4 Small Grids invite such a thing.
    Is even only 340 kilos easily.. titanium. Carbon. Graphitakku (not lithium ions from the Stone Age)
    Self-built. And design. Must be able to. and want.

    * Stvo:

    City 30/50 km / h (I do there on average 27.8km / h..)
    Country 60-90km / h
    60% of users roles a day full 45 km far. 45 km.

    Except our delivery drivers who need to clean their pool in Cape Town and get the brush in Olso..

    Start thinking.. &# 128578;

  7. Although the author writes about solar energy, but does not seem to have dealt with the topic of memory plus electric car.

    The electricity from my 9.6kwp system is relaxed in the summer loose to load the 10kWh memory in the basement. But with the 4 adult persons in our house this is empty the next morning regularly.

    We also wanted to load an e-car that always at the expense of the household stream, which would have to be purchased.

    The memory in the curve is clearly underdimensioned and should be better twice as large as indicated there.

    In summer, then the opportunity would be given to charge the car regularly at night.

    Our new e-car is still loaded at the weekend at sunshine, which also eliminates the conversion losses, which are incurred in the detour over the home memory.

    The statement in winter from the, as well as sized stores in addition to be able to load a car, is completely illusory. She is likely to fulfill itself in the rarest cases, image book weather assumed.
    From November to February, our solar coverage was 15 percent (without e-car).

  8. But I would rather use the second car as a store. He is on the same ever before the door. A car for the price of an EUP with bidirectional charging option &# 128526;


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