The municipal bus fleet in Munich, Germany, will soon be equipped with solar-powered trailer units.

From pv magazine USA

Sono Motors, an electric vehicle maker with a focus on integrating solar PV with transportation, has deployed its solar technology on the municipal bus fleet in Munich, Germany. The buses will be attached with a trailer that is topped with 20 semi-flexible solar panels.

The modules cover an area of 12 square meters and supply the 24V battery with more than 2,000W. In the pilot, the solar energy will be used to operate the HVAC system and support the trailer steering system. This saves the bus from burning diesel and stabilizes the battery’s energy supply, which lowers maintenance costs and extends battery lifecycle.

The PV system was custom-built for the needs of buses, and features the company’s proprietary maximum power point tracker (MPPT) unit and an algorithm-enabled charge controller designed to optimize energy production. Production can be tracked online through integrated software.

After technical approval by the supervisory authorities, the bus trailer will go into regular service, providing cleaner transportation for Munich residents.

“We need a change of course in the transport sector. Transport still misses the climate protection targets by a very wide margin, and this also has a direct impact on air quality in Munich. The solar buses can be a cornerstone in this urgently needed change towards climate-friendly mobility,” said Katrin Habenschaden, Munich vice mayor.

The company said a medium-sized fleet of 300 buses could save about 2,000 metric tons of C02 emissions each year. When considering the 1.5 ton C02 emissions “backpack,” or the amount of emissions related to producing the bus trailer, the carbon impact of production would be offset in less than one year of operation.

Sono Motors said its solar technology has been designed so that it can be integrated with a large range of vehicles. E-buses can be integrated with PV on their roofs and sides, extending range, reducing standstill times for charging processes, and protecting the battery for a longer life through steady power cycling.

“Especially in times of rising energy prices and increasing urban area emission regulations, our solar technology offers great added value for public transport operators. City buses and coaches, whether electric or diesel-powered, offer a lot of space and are out on the road every day. The first solar bus trailer for MVG will hit the streets of Munich in the future and allow MVG passengers to experience solar mobility in daily use,” said Laurin Hahn, co-founder and CEO of Sono Motors.

Sono Motors is also developing its own passenger vehicle, the Sion. The Sion sports a liquid cooled battery with a 54kWh battery and a 190 mile range and has 248 solar cells seamlessly integrated in the roof. The PV on the roof can add between 70 to 150 miles per week to that range.

The car can be charged 80% in 35 minutes via a fast charger, and is capable of public charging, at-home charging, and can exchange power vehicle-to-vehicle. Preorders are available in the German market. Sono said the former SAAB plant that will be used to produce the Sion will be powered by 100% renewable energy.