Ash accumulation has significant impacts on output characteristics of photovoltaic panels

and the impacts are quite different due to the influence of region

experimental environment and other factors. In response to this matter

the particle size distribution characteristics of different naturally deposited ash were analyzed

and the simulation samples of natural ash accumulation in different regions of China were constructed by using loess

laterite and kaolin respectively. An experimental platform composed of photovoltaic cell array

MPPT controller

host computer

light intensity measuring instrument and temperature measurement module was built up

and the effects of ash deposition on the volt-ampere characteristics

temperature

relative light transmittance and output power of photovoltaic panels were measured. Moreover

based on the experimental data

the fitting model was established for the relationship between relative light transmittance

relative power generation efficiency and ash density. The results show that

the temperature

relative light transmittance and relative power generation efficiency of the photovoltaic panels decreased gradually with the increase of ash density

and the decrease was related to the type of ash deposition. The calculation results show that

the established fitting model can be used to predict the photovoltaic power under the condition of ash deposition and to determine the cleaning cycle of ash deposition on photovoltaic panels.