China's Huawei Technologies, the world’s biggest solar inverter manufacturer, ended its U.S. inverter sales last week, according to an equity research note from Roth Capital Partners published Monday. The investment banking firm told Greentech Media that it has learned Huawei is moving to lay off or transfer some of its U.S. workforce, while maintaining some technical support and warranty staff. Roth senior analyst Philip Shen said the sales shutdown had been confirmed by three sources, including two Huawei customers. GTM contacted Huawei by phone and email, but did not receive a response and was unable to independently verify the report.