When building a new house, the planning of charging points or wall boxes for electric cars such as a BMW i3, BMW iX xDrive, Porsche Taycan or Tesla Model S is very important. We design and plan the electrical installation for the power supply and data connections almost every time we build a house.
The background: The electric house, which is a house with KNX infrastructure and its data lines including control, fits perfectly with an electric car and its battery storage. The advantage of the KNX smart home: All the intelligence and control is already there anyway, but installing a wallbox without charging control is not particularly intelligent, as this also uses expensive energy from the power grid to charge the car battery. The aim should therefore be to charge as much surplus energy as possible from the PV system directly into the e-car battery. At the same time, charging control should take place automatically in the background and follow a priority when other consumers in the house (e.g. stove, dishwasher, washing machine, etc.) are switched on.

We implement the following requirements with our KNX charging control system:

• Surplus energy from the PV system should charge the electric car battery directly
• Charging control via KNX Smart Meter and KNX EibPC
• 3 charge control modes: time control, current limitation and capacity indication
• Control via touchscreen visualization or KNX push-button in the room
• Integration of battery storage and grid feed-in (regulation/limitation)
• Accurate meter for currents and voltages (house connection tap)
• Consumption recording kWh
• 400 Volt charging station up to 11/22 kW with high power (3-phase 11 kW (3x16A) or 22 kW (3x32A))