Project background: in order to solve the water diversion of 30W local people and some agricultural irrigation water, the Chadian government chose the supplementary scheme of photovoltaic power generation + diesel engine for the people. In October 2020, our technicians were not afraid of the risk of epidemic infection and still went abroad to provide on-site installation technical guidance services for Chadian customers. After 15 days of hard work, photovoltaic power generation was successfully connected to the grid and diesel power generation, saving 2000L diesel cost for the waterworks every day.