MUNICH, Germany, 17 November 2022 – Sono Motors, the Munich-based solar mobility OEM, and pepper motion GmbH debut the first electric bus with the Company’s solar technology on the streets. pepper is an international OEM for the electrification (repowering) of used and new vehicles. As part of the ongoing collaboration, Sono Motors equipped an electrified Mercedes-Benz Citaro from pepper’s demo fleet with a customized version of the Solar Bus Kit containing 14 semi-flexible solar modules to provide around 1.3 kW peak to the 24-volt system. The energy generated by this installation is expected to be 3.3 kWh/day on yearly average based on weather conditions in Munich.

The project with pepper is the first time Sono Motors has performed electrical integration within an e-bus. The solar charge controller, the MCU, developed in-house by Sono Motors, transfers the solar energy to the 24-volt battery where it is used as the primary source of energy. The e-bus’ DC/DC charger takes over energy supply when the solar energy supply is insufficient. This means the solar energy is not directly used for driving but rather powering the HVAC and other auxiliary systems. This way, the stress on the high voltage battery and DC/DC charger is reduced and could therefore lead to longer operating hours, fewer charging cycles and a reduced total cost of ownership.

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