What are the effects of dirty solar energy for a long time and the influence of dirty solar panels on their work.
In the first experiment, we collected data on dust accumulation and work efficiency of solar panels at different installation angles
2 the experimenters carried out detailed experiments on the influence of dust on the solar panel collector. Seven solar panels were used in the experiment. Six of them were divided into three groups, two in each group, and were subjected to various inclinations of 0 °, 30 ° and 60 °. The seventh collector is inclined vertically by 90 °. In each group, one collector is regularly cleaned while the other is not disturbed. The solar energy absorbed by the unclean plate is calculated and compared with the cleaned plate. One observation indicates that the dust collection volume between April and June is about 2.5 g / m2 / day. Sayig et al. 3. Also studied the effect of long-term dust accumulation on solar glass panels. After exposure for about 38 days, the light transmittance of the panel decreased by 64% to 17% from the inclination angle of 0 ° to 60 ° respectively. In addition, after 3 days of dust accumulation, the useful energy gain of the horizontal precipitator was reduced by 30%. The following figure shows the effect of tilt angle on the decrease of solar transmittance
Figure 2 show us that due to dust accumulation there is a slight reduction in panel’s voltage and hence power. The maximum voltage obtained in this case is 18.32 volts at maximum lux of 21500 W/m2. The table given below illustrate the data for dusty panel collected during experiment.
Accrual of dirt on exterior of PV panel also leads to a decline of efficiency of the solar PV. Efficiency of PV array is observed on the basis of voltage variation of clear and dusty panel.
N= VP X IP /PS X A
Vp and Ip are the voltage and current of the solar panel, Ps is the power generation, and A is the surface area of the solar panel. According to the experimental data collected in the test process, the voltage of clean plate and dust plate are compared. As can be seen from the following figure, the voltage of the solar panel decreases significantly due to the long-term accumulation of dust on the surface of the solar panel. In the worst case, a decrease in panel voltage can result in a 40-50% decrease in panel efficiency. This can lead to huge energy conversion losses. The following table shows the data collected by cleaning the dusty plate experiment. When the maximum light intensity is E, the effect of dust on the luminescence efficiency is about 71%, and the luminescence efficiency is improved by 90% on this basis.
As shown in the picture above. According to one experiment, on a cleaned solar panel. The reduced amount of dust and the efficiency of sunlight conversion are obvious hints.Clean the panels regularly with water and a brush to remove all the dust more quickly. Get the solar panels back to about 20 percent of normal efficiency.