Dear Tesla S drivers
Over the last weeks rumors have come to our attention that our product, the Keba KeContact P20, supposedly shows incompatibilities with Tesla Model S vehicles. It has been reported that affected vehicles do not start charging despite solid "green-green-green-green" lights on the wall boxes' front HMI.
We therefore want to rectify the situation and provide some explanatory words as for the alleged erroneous functions in the KEBA wall box.
First, the Keba KeContact P20 complies with all applicable standards and requirements in all respective markets. The product reaches even beyond that: Unlike other EVSE (Electric Vehicle Supply Equipment) manufacturers, we decided already at an early development stage to build in a current monitoring device, because standard circuit breakers which are installed in upstream installations have comparatively slow tripping characteristics. This built-in device is an essential safety feature in our product that distinguishes us from competitors in terms of operational safety.
The built-in current monitoring is highly precise, measuring deviations from the maximum current settings in real time. In all reported incidents that show the aforementioned pattern the KEBA wall boxes measured temporary excess current drawn by the vehicle. In such an event, KEBA EVSEs reboot and try to re-establish charging sessions by signaling to the vehicle that charging can be resumed ("green-green-green-green"), upon which some vehicles with newer firmware versions apparently do not respond.
We and our sales and service partner in The Netherlands and Belgium ThePluginCompany are in contact with Tesla in this matter and we have been informed that vehicle firmware adaptations were already made. This new firmware is currently being rolled out and affected customers are advised to contact their local Tesla dealers.
In conclusion we want to emphasize that the KEBA KeContact P20 is a safe, robust and reliable EVSE, suitable for all available electric vehicles. We continuously test and evaluate our product with cars of all makes and, if necessary, adapt to new findings or changes in applicable standards. Our current installed base, which is growing from day to day and soon reaches 10,000 units across the globe, proves that.
Sincere thanks for your trust in our product,
KEBA KeMove development & sales team