Photovoltaics & e-mobility - Fronius e-mobility solutions

PV SURPLUS CHARGING FOR SUSTAINABLE MOBILITY

Anyone who wants to save on energy costs shouldn’t overlook the mobility sector. The combination of photovoltaics and e-mobility enables especially large savings.

Those who already have a photovoltaic system can make use of unused energy with the aid of Fronius solutions by switching to an electric car.

Vice versa, it also makes sense for all electric car owners to consider purchasing a photovoltaic system. This is because it is far cheaper to charge the car at home using self-generated solar power than it is to use mains electricity.

ADVANTAGES OF THE COMBINATION OF PHOTOVOLTAICS & E-MOBILITY

Increased solar self-consumption rate
PV system and electric car pay for themselves more quickly
Low-cost electricity for the electric car
Less energy sourced from the grid

Fronius offers a number of solutions for charging electric cars using energy from a photovoltaic system. These range from simple solutions without energy management right through to the intelligent charging solution with the Fronius Wattpilot. The refined charging solution featuring the Fronius charging box enables dynamic surplus charging and therefore optimum use of the self-generated solar power.

Our three solutions are explained in detail below.

DYNAMIC PV SURPLUS CHARGING

Dynamic surplus charging ensures the optimum use of surplus PV power and reduces infeed into the grid to a minimum. By using intelligent charging boxes, even the smallest amounts of surplus energy can be used to charge the electric car.

• PV surplus • electric car*

The charging process starts automatically as soon as there is a surplus energy present and adapts to the amount of energy currently available. After one-time configuration by the installer, this solution ensures that the car will automatically be charged using solar power that would otherwise flow into the grid.

This solution can be implemented perfectly with a combination of the Fronius Wattpilot and Fronius inverters. The inverter’s open interfaces enable direct communication with the intelligent charging box.

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DYNAMIC CHARGING WITH THE FRONIUS WATTPILOT

With the Fronius Wattpilot charging box, you can offer your customers an intelligent charging solution that enables dynamic PV surplus charging.

Thanks to the fully automatic 1-/3-phase switching, it is possible to make even better use of surplus PV energy from 1.38 to 22 kW.

The Wattpilot is also compatible with variable electricity tariffs. This means, for example, that current from the grid can be used for charging very cheaply at night during low-tariff periods.

More about the Fronius Wattpilot

PV SURPLUS CHARGING WITH ENERGY MANAGEMENT

If no intelligent charging box is installed in the system, the Fronius inverter with energy management function can also control the charging process.

• PV surplus • electric car*

The inverter will then always use a digital output to control a charging socket or simple charging box if a defined PV power or PV surplus threshold value is reached.

In contrast to dynamic surplus charging, the charging process for this variant cannot be constantly regulated. The charging power is fixed for each charging process. The inverter activates and deactivates charging automatically depending on the PV surplus present.

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Fronius inverters &
Simple charging solution with release contact or upstream relay

MANUAL CHARGING OF SURPLUS PV

Alternatively, charging can also take place without energy management. However, the charging box must be activated manually for this variant as soon as a PV surplus is available.

Nevertheless, the charging power of the charging box must be adapted to the power of the photovoltaic system. Otherwise this could lead to expensive load peaks.

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