Dust has a significant effect to preventing view and radiation transfer from source to recipient; Photovoltaic Solar Panels (PSP) used in producing electric power has its share of that effect as a result of blocking part of the solar radiation falling onto the photovoltaic solar panel which is considered as work principle of the photovoltaic solar panel. This research studies the effect of that dust on the photovoltaic solar panel via measured of voltage and current for both of dusty and non-dusty photovoltaic solar panel as well as output electrical power to compare between of them. Solar panels which used in this research is of type (Polycrystalline silicon solar Panels). Test data have been measured of a semi- shiny day in November at Iraq, Najaf city. Results has studied and analyzed to prove that electrical power of non-dusty (cleaned) higher than dusty photovoltaic solar panel that is mean cleaning of panels, is so necessary to get higher electrical power.

Index Terms- solar power, photovoltaic, solar PV, renewable energy, dust accumulation