Egyptian systems keep solar panels free of desert dust ^{CEFR B2}

Dust buildup is a serious problem for solar panels in arid regions because it insulates panels, blocks sunlight and reduces performance. Studies in the Middle East and North Africa show steep losses, from 17 per cent in six days in Kuwait to up to 66 per cent over six months in Egypt. To address this, researchers at the German University in Cairo developed two nature-inspired cleaning systems and a company founded by engineer Hossam Mohamed commercialised the designs.

The first system is electrically driven and uses a small motor with an unbalanced metal weight to create mechanical vibrations. An electronic unit controls when the unit runs; it shakes off dust twice daily, at noon and again at 3am, for about one minute each time. It can draw power from the panel or from a small independent battery, and the panels also use an antistatic nano-coating. Field trials showed that conventional, uncleaned panels lost about 33 per cent of efficiency after six weeks, while panels with the vibration system and coating lost only 12.9 per cent in the same period.

The second design is wind driven and needs no electric motor. It mimics how tree branches sway: a flexible mounting lets the panel vibrate in passing air and a rear spring returns it to position. This wind-driven option lost only 5 per cent in a six-week field trial, compared with about 25 per cent loss in traditional fixed panels; researchers say performance varies with the seasons and may be better when winds are more constant.

Experts have commented on costs and durability. Essam Tawfik El Shenawy at Egypt’s National Research Centre praised the idea but raised questions about continuous vibration and whether the system is more economical than manual cleaning. Mohamed says the system has been rigorously tested and calibrated to avoid damage. Mohamed Salama Abd-Elhady at the German University gave a cost example: cleaning a single lamppost-mounted panel can cost up to 200 Egyptian pounds (US$4) per month, so a complex with 200 lampposts might spend 40,000 pounds (US$800) monthly. The company is expanding production after positive reception and has supplied another residential community in Giza governorate.