Solar Panel Cleaning

Cleaning Solar Panel


We think so! And there are many studies that confirm this as well. Consequently, periodical cleaning of solar panels is very important in order to produce and deliver the maximum amount of energy to the grid. The effect of dirt and dust on the performance of solar panels depends on various factors and always needs to be estimated or evaluated for individual situations. One can generally assume a reduction of about 10%-20%1) 2) if solar power plants in Europe or the USA are considered. As soon as the installation is located in dry, dusty regions such as the Gulf region, the effect can be increased and make a difference in power of up to 40% 3) 4).

A simple calculation can be used to find out if solar panel cleaning is worthwhile. The profit gained from cleaning the panels must be higher than the costs. The parameters needed for this are the feed-in tarif received per kW/h and the size of the installation.

The following example shows the significant losses that can result from contamination:

Initial Situation:

Plant size: 25 MWp

Expected Production per Year: 25‘000 MW/h

Feed-in Tarif: 0.20 EUR/kWh

Expected Yield: 5 Mio. EUR pro Jahr


  • Expected losses from contamination at 10% contamination: 500,000 EUR
  • Expected losses from contamination at 15% contamination: 750,000 EUR
  • Expected losses from contamination at 20% contamination 1,000,000 EUR


Serbot provides the solution for efficient and thorough solar panel cleaning for various customers:

Plant Operators:

A new tool in the hand of the operation and maintenance team at commercial and utility scale plants: Keep the performance ratio high, and ensure maximum yield!


Plant Manufacturers:

An opportunity for plant manufacturers of residential PV plants to offer a new after-sales service: Keep your customers happy in the long run!


Cleaning Companies:

A chance for traditional cleaning companies to offer a new cleaning service to the quickly growing PV industry: Go for it – the need, along with the installed surface, is there!



1) Gradual Reduction of energy production of pv plants through continuous soiling. Prof. Dr. H. Häberlin and Ch. Renken. University of Applied Science Bern. University of Technology and Architecture Burgdorf

2) According to the Solar Electric Power Association (SEPA), PV electricity output will decline approximately 10% due to accumulation of dirt, dust, and other residues. Research cited by SEPA indicates that PV electricity generation will decline 15-20% in areas where bird droppings, urban pollution or dust from farming operations are common.

3) A. Salim, F. Huraib, and N. Eugenio, " PV power-study of system options and optimization," in Proceedings of the 8th European PV Solar, Energy Conference, Florence, Italy, 1988.

4) F. Wakim, "Introduction of PV power generation to Kuwait," Kuwait Institute for Scientific Researchers, Kuwait City, 1981.