Battery sales; battery parts sales; photovoltaic equipment and components sales; solar thermal equipment sales; photovoltaic power generation equipment leasing; gears and gear reduction, gearbox sales; construction metal parts sales; Power equipment sales; technical services, technology development, technology consultation, Technology Exchange, technology transfer, technology promotion. Manufacture of transformers, rectifiers and inductors; import and export agents. (for projects subject to approval in accordance with the law, the relevant departments may not start business activities until they have been approved by the relevant departments. The specific business projects shall be subject to the approval documents or permit documents issued by the relevant departments.)