Abstract: Wind tunnel experiments were conducted to study the effects of sand accumulation on the output characteristics of solar photovoltaic (PV) modules at different sand concentrations and wind speeds, so as to plot the output characteristic curves at different dip angles, and to compare the power generation efficiency with and without sand accumulation. Results show that at low wind speeds, the power output of all the components at different angles changes slightly between the case with and without sand accumulation, showing a reduction degree below 5%; whereas at high wind speeds, the power output changes significantly between the case with and without sand accumulation, showing a reduction degree in 5%-10%. At installation angles of 30° and 60°, the power output of solar PV modules in pure sand environment presents obvious turning features.