Chinese solar panel maker Trina Solar is planning to build its third factory in Vietnam, three people familiar with the matter told Reuters, a move that would boost exports to the United States following punitive duties to be imposed on products it makes in Thailand. The company, one of the world’s biggest solar panel makers by sales, would invest $400 million in a plant spanning 25 hectares (60 acres) of industrial land, said the sources who asked not to be
