More safety thanks to RCD and larger cable cross-section
During a charging session with a standard plug, an electric car uses almost as much electricity as an oven - and it does so for many hours. Standard cable cross-sections and sockets are not designed for this, which is why the cooker and oven at home are always connected using larger cables. To illustrate this more clearly: If an electric car is charged at home using the so-called emergency power cable, it is like forcing the entire power consumption of a household through a single cable and plug - because the annual consumption of an average electric car with average mileage is roughly equivalent to the average household consumption. This is why overheating and, in the worst case, a cable fire can quickly occur. The professional installation of a wallbox by a specialist electrical installer, if not already in place, is always accompanied by the laying of a sufficiently dimensioned cable, checking the need for a residual current circuit breaker and the selection of the correct line circuit breaker. All these measures ensure safe charging.
More safety and comfort thanks to the wallbox
Another advantage of a wallbox is its integrated residual current monitoring. It prevents the lights from going out in the house if problems should arise during the charging process. Apart from that, the wallbox automatically resumes charging after unexpected faults (such as overvoltage or undervoltage in the supply network or even a total power failure). This means that you are not surprised by a low battery level when you start your next journey. An intelligent wallbox (such as our KeContact P30 x-series) even adjusts the charging power to the domestic electrical installation and throttles the charging currents if necessary. All KEBA wallboxes also directly measure the socket temperature and also reduce the current flow in the event of dirty or damaged charging contacts, for example.
All KEBA wallboxes also measure their own operating temperature and regulate the power depending on this. In addition, they interrupt the current flow in the event of dirty or damaged charging contacts and an error message is shown on the LED display.
Faster charging thanks to the wallbox
Another important aspect is the charging speed. The charging power of the Type F cable is limited to 2.3 kW. This means that an electric car with an average battery capacity of 55 kWh has to be connected to the power supply for almost 24 hours to be charged from minimum to maximum level. A vehicle with a larger battery will need correspondingly longer. For most EV models, a wallbox allows charging at 11 kW, which reduces the charging time of the example vehicle to just 5 hours. It is even faster if the network operator, the house installation and the electric vehicle itself permit 22 kW charging power. In this case, the wallbox can recharge up to 150 km per hour, depending on the vehicle's consumption.
So there are more than just a few good reasons to charge at home with a wallbox and to really only consider the emergency charging cable included as standard for what it is: an emergency solution.
Load management - importance and benefits
There are still more ICE vehicles than electric cars. But what if the situation changes over the next few years? Are the power inputs, particularly of large residential buildings, de-signed to have the majority of tenants “fill their tanks” at home? The answer is yes – if the load management is sophisticated enough.
Cooperation with Loxone for the smart home of the future
Environmentally aware owners of electric vehicles will be connecting their KeContact P20 wallbox to the Loxone Smart Home System in the future. The car is charged depending on the energy output of the photovoltaic system and the consumption of the rest of the house.
Is it worth having a wallbox for my plug-in hybrid (PHEV)?
With modern plug-in hybrids, distances of up to 90 kilometers can be achieved purely electrically. That is usually enough for the commute to work or other everyday journeys. All the same, the batteries of these PHEVs are significantly smaller than those of purely battery-electric vehicles (BEVs). So, is a household socket sufficient for daily charging or does it still make sense to have a wallbox?