Maximum economy with photovoltaics and electric car: that's how it works

von zolar am 29.06.2021

Getty ImagesDie Kombination aus PV-Anlage und E-Auto schafft finanzielle Vorteile

Solar energy has long been profitable in self-consumption-the combination of PV system and electric car creates the maximum financial added value.

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All advantages of solar power and e-mobility at a glance:

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How to calculate the required size of the solar system and memory

In order to refuel your own electric car as environmentally friendly and inexpensive as possible, the in -house solar system must have the right size and thus the right installed performance.In addition to an optimally configured system, a suitable power memory for charging processes outside the sunny hours is also an advantage.If you want to keep the costs of your solar system low, it makes sense to include the (planned) electric car already in the planning of the PV system.

As a rule, solar systems with a charging option for vehicles from solar modules, electricity storage, wall box and at best an intelligent energy management system.In principle, it can be assumed that Pro 1.000 kilowatt hours of solar power a kilowatt peak installed performance must be available.If the electric vehicle is to be refueled primarily during the day with the current generated, the consumption must be included in the size calculation of the system based on the budgetary requirements.

Maximale Wirtschaftlichkeit mit Photovoltaik und E-Auto: So geht's

If the electric car is to be loaded primarily in the evening, you need a power memory with the appropriate capacity.The rule of thumb applies: per 1.000 kilowatt hours of consumption, the power memory should bring about 1 kilowatt hour of storage capacity.Since the excess of generated solar energy generally flows into the power storage, the storage capacity of the power storage of this amount should correspond to electricity.

A power storage that is too large or too small is disadvantageous, since either usable electricity is automatically fed into the public network and is not saved, provided that the memory is already fully charged, or too little electricity is generated for the storage capacity and thus the acquisition costs and the production of theAmortize the device very slowly.The discharge output of the memory must also be taken into account.This should be based approximately to the charging power of the electric car, but at least 1.4 kW is even if in the evening it should only be loaded with solar power.In general, however, it is advisable to load the electric car mainly during the day if the solar power is available in abundance.

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So your electric car is loaded with solar power

With an intelligent energy management system, the charge of the electric car is even easier: connected to the PV system, this is loaded directly during the day with surplus from electricity production.The energy management system ensures an optimal distribution of electricity to the household, the power storage and the electric vehicle, by calculating the respective needs and the generated amount of electricity.In many cases.Since roof surfaces for the installation of solar systems are of different sizes and less electricity is produced in darker seasons, an additive load with a mesh current may sometimes be necessary.Whether and in what amount this is necessary for you depends on your household consumption, the size of the system and the needs of your electric car as well as on the daily kilometers that you cover.

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Financial advantage of e-car and solar system

The domestic loading processes with your own PV system are practical: the way to the next public charging station is eliminated, the car is usually directly ready to go.But the financial advantage also brings more and more e-car owners to their own solar system and the other way around.Whether you load your vehicle at home or at public tank columns with a network current - the price is unchanged.31.89 cents per kilowatt hour of the network current pay consumers in July 2021.A stately sum in a direct comparison with the cost of solar power from your own house roof of around 8 cents per kilowatt hour.What PV system operators have long known: the higher the self-consumption, the more lucrative the solar system.You can save several thousand euros annually, only because of the production of solar power.In addition, you make a valuable contribution to the energy transition.

If an electric car in your household exists, the annual savings potential can be maximized.Based on a vehicle like the Hyundai Ioniq, with a consumption of 16.3 kWh per 100 kilometers, you would pay the equivalent of around 5.20 euros per 100 km without a PV system.If, on the other hand, the car drives with a solar power from the house roof, the costs of the same route only amount to 1.30 euros.A saving of around 3.90 euros per 100 kilometers.

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Wallbox promotions for e-car owners

Due to the nationwide promotion of the KfW bank, e-car owners can significantly reduce the acquisition costs for an in-house wall box.The Wallbox is granted a grant of 900 euros per charging point;The acquisition costs of the charging station must be at least this value, otherwise the funding amount will be reduced accordingly.The funding is only available for charging stations on residential buildings and without public access.For solar system operators, the Wallbox funding of the KfW is particularly interesting: it requires 100 percent supply with green electricity.If you do not generate renewable energy, you have to switch to an green electricity tariff with which the electric vehicle can be fully refueled with environmentally friendly electricity to the network current tariff.The operator of a solar system can drastically reduce the additional costs for additional network current from the start, since the WallBox can easily use the solar power for loading the vehicle.The proof of the exclusive use of green electricity when applying for the application also requires a contract with an eco-electricity provider for PV owners.

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Conclusion

The consumption of self -generated solar power is more favorable than ever.The key to financial independence and maximum economy is: self -consumption.The more electricity from your solar system you consume yourself, the more money you save every day.Savings can grow into thousands with the operation of a solar system - the reason for the quick financial amortization of environmentally friendly energy producers.

By supplying your vehicle with solar power you even benefit twice: Because it has never been easier to save CO2 and actively shape the energy transition.You too will benefit from the financial advantages when buying a solar system and get advice on the funding opportunities for your wallbox.

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