Frequently Asked Questions

  1. Should all solar panels be cleaned?


Absolutely. Dirt and smog accumulate on the panel surface are blocking the sunlight, thereby reducing electricity output of the system. Local soiling such as bird feces may reduce the solar system’s output, sometimes even more than homogeneous dust. Systems without power optimizers may exhibit more severe reduction in electricity output. In those systems, when one or some panels within a string is/are dirty, the electricity production of the entire string will decrease.


  1. How often should solar panels be cleaned?


Cleaning frequency depends on the amount of dirt accumulated and varies by location and season. SolarRobot Cleaner can be programmed for the needed cleaning frequency to prevent even small reduction in electricity production. Also, a unique module that monitors electric output daily and executes cleaning process upon measured output reduction can be added.


  1. How does cleaning affect electricity production?


Dirt accumulation on solar panels reduces electricity output by 3-15% (assuming solar panels that are manually cleaned 8 – 12 times a year). Therefore, maintaining panel cleanliness can bring back those lost electrons and system profit.


  1. Can SolaRobot Cleaner be used to clean any solar systems?


Generally speaking the answer is Yes, but the following guidelines will ensure good return on the investment.

    1. PV systems above 400 KW
    2. Minimal variance in solar panel arrangement on the roof


  1. What is the cost of the cleaning?

The cost of cleaning is determined in accordance with the PV system by a number of variables, the main one being the number of panels in the system. Compared to manual cleaning, mechanical cleaning cost is much lower. The main difference between mechanized cleaning and manual cleaning is that the purchase price covers many more cleanings. Indeed, when cleaned more frequently, automated cleaning expenses are higher (e.g. more electricity and treated water for robot operation), but these expenses are relatively negligible when compared with the gain in system output. For more information regarding pricing, please contact us to coordinate a consultation.


  1. What is my profit from frequent cleaning?

Frequent cleaning means cleaning every day or every several days. This is way more frequent than once a month or once every two month of manual cleaning. Cleaning frequency may differ from system to system and depend on the dirt accumulation rate. In terms of system output, frequent cleaning will increase the output by 3% – 15%.


  1. Is tap water suitable for cleaning the panels? What water should be used by the SolaRobot Cleaner?

Tap water are not recommended because of scale buildup on the panels is expected over time, blocking the passage of the sun’s rays, and reducing the electricity output. We use purified water to prevent scale buildup for best cleaning results.


  1. Is the cleaning done automatically?

Yes. The SolaRobot Cleaner activates its cleaning cycle according to a program. No supervision, or the presence of an operator is required during the process.


  1. Is The SolaRobot eco-friendly?

Definitely. The SolarRobot Cleaner is activated at dawn to utilize dew condensation on the panels, allowing for reduced water consumption by the system. Working at night, SolaRobot Cleaner does not block the solar rays. Also, The SolaRobot Cleaner is light and is driven by small and efficient electric motors.


  1. Does the cleaning require use of soap?

No, soap is not needed. Frequent cleaning with purified water followed by brushing maintains the panels clean.


  1. Why does the automatic cleaning system superior to manual cleaning?

A. SolaRobot Cleaner allows peace of mind when it comes to clean panels and system output. Frequent cleaning prevent decrease in electricity production due to dirt on the panels.

B . Installing the SolaRobot Cleaner allows a more efficient arrangements of the panels (no need for space between rows for service) to maximize number of panels used, and increase profit.

C . The system can be cleaned daily or as needed, at no extra cost (except for maintenance).

D . Installing an automated system prevents the risk of working at heights and the risk of electric shock.


  1. Does the system require regular maintenance?

Yes and no. SolarRobot system is an autonomous system that operates without an operator. Most of system components are designed to work for many years without maintenance. The water purification system will need yearly maintenance. Maintenance frequency depends on cleaning frequency and water condition. Maintenance consists, mainly, of water purification filter replacement.


  1. Does the SolarRobot Cleaner fit all photo-voltaic systems?

In terms of cost and benefit, SolaRobot is highly recommended for commercial systems of at least 400 kW. The more uniform the structure of the system, and the longer the rows, better economic profitability is expected. It is possible to customize SolaRobot to fit existing installations. Please contact us for a free consultation.