Charge your Electric Car with your own Photovoltaic Electricity and enjoy 100% Emission-Free Driving

28. April 2016 Matthias Suttner Everything About Charging Your Electric Car Tags: , , , , 0 Comments

Charging an electric car with the power from your own photovoltaic system (PV system) is a rewarding experience. After all, a PV system with an output of 5 kWp can supply up to 5000 kWh (kilowatt hours) of electricity per year. If your electric car has an energy consumption of 17 kWh/100 km, then you are driving almost 2,500 km per month emission-free. So charging your electric car with PV power not only takes the strain off your ecological conscience, but your wallet too.

Charge with PV Power and save Money as you increase Consumption

Due to decreasing rates of remuneration for feeding power into the grid and increasing electricity costs, the private consumption of PV electricity is gaining in importance. Instead of selling on privately generated electricity at low prices (remuneration for new systems under the German Renewable Energy Sources Act stood at 12.3 cents/kWh in Sept. 2015), you should consume or temporarily store as much of this power as possible yourself. You can increase your own consumption for example by using PV power to charge your electric car and by implementing intelligent consumption regulators such as the smartfox Energy Manager. Today, the saving for every kilowatt hour you consume yourself is already up to 18 cents. This is because you do not need to draw any expensive power from the electricity grid (26-30 cents/kWh), or temporarily store the PV power you have generated in the electricity grid for higher costs. Our Self-Consumption Calculator helps you to estimate the potential savings from maximising the use of your self-produced energy.

Supply your Household, Electric Car and the Electricity Grid with at least 5 kWp of PV Electricity – here’s how:

When using PV power, the maximum charging power for your electric car depends on factors such as the size of your PV system and the consumption profile of other appliances in your household. The larger your PV system and the smaller the electricity consumption of your household appliances, the greater the maximum charging power available with PV electricity. With a system capacity of 5 kWp and domestic consumption of 1 kW, 3.7 kW will still be available for single-phase electric car charging at a charging station. There will also be 0.3 kW left over to be fed into the electricity grid.

Charge your Electric Car Emission-Free with PV Power one day, and use your Car as an Energy Storage unit the next – from Uni-Directional to Bi-Directional Charging

There are two basic ways to connect your electric car to a PV system:

At present, the current flows by means of a uni-directional connection one way only: from the PV system to the charging station, and from there into your electric car. Using a charging management system such as the smartfox Energy Manager enables you to have your electric car prioritise power from your PV system, therefore increasing your own consumption. If the sun isn’t shining when you need to charge your electric car, then you can simply draw additional power from the grid at the touch of a button. So you remain independent and flexible at all times.

In the future, the current will not only flow into the electric car, but – by means of a bi-directional connection – it will also flow back from your electric car into your home or be fed into the electricity grid. The electric car will in this way take over the task of a battery storage unit. When more PV power is available than is required by the household, then your electric car is charged. If less PV power than you need is available (e.g. in the evening or during the night), the household is supplied with electricity from the car battery. In addition, the battery is capable of stabilising the electricity grid, by the car being connected to the balancing energy market as part of a swarm storage unit (Vehicle-to-Grid – clearly and simply explained in our video). However, bi-directional charging stations are still under development. To help drive the future forwards, The Mobility House is participating in extensive tests of bi-directional charging in its office’s underground car park – and is now brewing green coffee with the Nissan Leaf: “The Mobility House brews coffee using green electricity from an electric car“.

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