Sōlrobo — soiling simulator
See what dust actually costs, for your city.
Pick a city and set how long it’s been since the panels were cleaned. Watch the roof soil in real time, and watch the performance ratio — and the money — fall with it. Then hit clean, and see what Sōlrobo is actually worth.
The soiling rates, performance ratio, and tariff behind these numbers are grounded in published field research rather than invented for the demo — full citations are listed below.
City
Days since last cleaning
15Performance ratio
Energy lost
38 kWh
Money lost
90 EGP
15 days without cleaning in Cairo / Giza costs this system about 90 EGP so far.
References
- Elminir, H.K., Ghitas, A.E., Hamid, R.H., El-Hussainy, F., Beheary, M.M., Abdel-Moneim, K.M. (2006). “Effect of dust on the transparent cover of solar collectors.” Energy Conversion and Management, 47(18–19), 3192–3203. Field study on Cairo/Helwan collectors — the basis for the Cairo/Giza estimate.
- “Impact of dust and tilt angle on the photovoltaic performance in a desert environment.” Solar Energy (2025). A year-long Aswan field study — the direct basis for the Aswan / Benban figures in this simulator.
- Atia, D.M., Hassan, A.A., El-Madany, H.T., Eliwa, A.Y., Zahran, M.B. (2023). “Degradation and energy performance evaluation of mono-crystalline photovoltaic modules in Egypt.” Scientific Reports, 13, 12943. Source of the clean-system performance ratio used here.
- “Effect of sand dust accumulation on photovoltaic performance in the Saharan environment: southern Algeria (Adrar).” Environmental Science and Pollution Research (2018). A comparable Saharan-desert study, used as a regional cross-check — not cited as Egypt-specific data.
- Egyptian Electricity Regulatory Authority (EgyptERA), 2026 residential electricity tariff schedule (schedule summary). Source of the tariff used to convert lost output into EGP.
- World Bank Group / ESMAP, Global Solar Atlas. Source of each city’s specific-yield (kWh/kWp/day) figure.
Only Aswan/Benban is fitted directly to a study conducted there. The other eight cities are engineering estimates interpolated relative to that anchor by aridity and pollution exposure, disclosed as such rather than presented as independently measured — see the inline comments in src/lib/soiling/config.ts for the full reasoning behind each figure.