Sono Solar and MTTE (Mitsubishi Heavy Industries – Thermal Transport Europe) present integrated solar solution for electric cooling units in semi-trailers
Munich/Osnabrück, September 24, 2025 – Sono Solar and MTTE are intensifying their partnership, which began in 2022, and are presenting the first fully integrated solar solution for electric and hybrid refrigeration units in semi-trailers. The aim is to make transport refrigeration more sustainable, more efficient, and less dependent on diesel power.
The jointly developed solution combines MTTE’s TEF1500 electric/hybrid refrigeration unit – including battery unit – with a powerful complete solar system from Sono Solar. This comprises highly efficient solar modules and an intelligent charge controller that continuously supplies the battery with free, green solar power.
“We are delighted about this cooperation with such a renowned partner. Together, we can now offer one of the first solar solutions for the European market, supported by MTTE’s strong expertise and service network,” explains Jan Schiermeister, Managing Director of Sono Solar.
A fully equipped semi-trailer with the integrated system is now available for testing. Interested freight forwarders, refrigerated transport companies, and fleet operators can contact the partner companies directly. Expansion to other vehicle types, such as small vans, is already in the planning stage.
Björn Reckhorn, Managing Director of MTTE, emphasizes: “We are delighted to be working with Sono Solar to take solar integration for refrigerated vehicles to a new level in terms of both quality and quantity. We clearly see electrically powered refrigeration units with solar integration on the vehicle roof as the future of transport refrigeration.”
With this solution, the two companies are responding to the growing demand for low-emission refrigerated transport in the European market – particularly with regard to regulatory requirements, fuel savings, and CO₂ reduction. The new collaboration can already be experienced at Nufam in Karlsruhe from September 25-28, 2025, where both MTTE and Sono Solar will be presenting the solar solution.
ABOUT MITSUBISHI HEAVY INDUSTRIES THERMAL TRANSPORT EUROPE GMBH (MTTE)
Founded in Osnabrück in 2018, MTTE set out with the goal of bringing environmentally friendly and service-friendly transport refrigeration systems to the market for a quieter and more efficient cold chain. MTTE is a joint venture between Mitsubishi and refrigeration unit specialist HEIFO, which has been the general importer of Japanese Mitsubishi refrigeration systems since 1998. MTTE is managed by managing directors Björn Reckhorn, Hiroyuki Otake, and Hiroshi Shiraishi. Under the new brand name PRECISO, Mitsubishi has been bundling all fully electric transport refrigeration systems since 2022. The Japanese manufacturer is consistently pursuing the electrification of its refrigeration systems and is continuously expanding its fully electric portfolio.
ABOUT SONOSOLAR
Sono Solar, a brand of Sono Motors GmbH, stands for the transformation of a pioneering automotive start-up into a technology-oriented pioneer for solar mobility. Sono Motors GmbH is a wholly owned subsidiary of Sono Group N.V., a holding company registered in the Netherlands and listed on the NASDAQ stock exchange under the ticker symbol SSM. Sono Group N.V. is responsible for strategic oversight and investor relations. The operational arm, Sono Motors GmbH, focuses entirely on the implementation of its solar technologies under the Sono Solar brand.
FORWARD-LOOKING STATEMENTS
This press release may contain forward-looking statements. The words “expect”, “anticipate”, “intend”, “plan”, “estimate”, “aim”, “forecast”, “project”, “target”, “will” and similar expressions (or their negative) identify certain of these forward-looking statements. These forward-looking statements are statements regarding the intentions, beliefs, or current expectations of the Company and Sono Group (together, the “companies”). Forward-looking statements involve inherent known and unknown risks, uncertainties and contingencies because they relate to events and depend on circumstances that may or may not occur in the future and could cause the companies’ actual results, performance or achievements to differ materially from those expressed or implied by such forward-looking statements. These risks, uncertainties and assumptions include, but are not limited to, risks, uncertainties and assumptions with respect to: the timing of the reverse share split; the goals of the reverse share split; the impact of the reverse share split on Sono Group’s share price; Sono Group’s ability to uplist to the Nasdaq Capital Market, including meeting the initial listing requirements; Sono Group’s ability to satisfy the conditions precedent set forth in the Securities Purchase Agreement and Exchange Agreement; the timing of closing the transactions contemplated by the Securities Purchase Agreement and the Exchange Agreement; the impact of the transactions contemplated by the Exchange Agreement and Securities Purchase Agreement on Sono Group’s operating results; the ability to access the unfunded portion of the investment from Yorkville, including our ability to successfully comply with the agreements related thereto and the absence of any termination event or any event of default; our ability to maintain relationships with creditors, suppliers, service providers, customers, employees and other third parties in light of the performance and credit risks associated with our constrained liquidity position and capital structure; our status as a foreign private issuer under the Securities Exchange Act of 1934; our ability to comply with OTCQB continuing standards; our ability to achieve our stated goals; our strategies, plan, objectives and goals, including, among others, the successful implementation and management of the pivot of our business to exclusively retrofitting and integrating our solar technology onto third party vehicles; our ability to raise the additional funding required beyond the investment from Yorkville to further develop and commercialize our solar technology and business as well as to continue as a going concern. For additional information concerning some of the risks, uncertainties and assumptions that could affect our forward-looking statements, please refer to our filings with the U.S. Securities and Exchange Commission (“SEC”), including our Annual Report, which are accessible on the SEC’s website at www.sec.gov and on our website at ir.sonomotors.com. Many of these risks and uncertainties relate to factors that are beyond our ability to control or estimate precisely, such as the actions of courts, regulatory authorities and other factors. Readers should therefore not place undue reliance on these statements, particularly not in connection with any contract or investment decision. Except as required by law, Sono Group assumes no obligation to update any such forward-looking statements.
