Every solar panel installation is unique and depending upon different environmental factors, the recommended frequency of each clean will vary.
Special attention should be given to panels situated in dustier areas, for example; next to a main road, on, or near farmland etc. These panels will require more frequent cleaning as the dust build up will be considerably more and the larger the installation, the bigger the loss of return is for the owner.
Bird lime is also a huge problem! When solar panels are left uncleaned for long periods of time, the real concern comes with not only temporary unit shading, but also with permanent staining.
The FiT (feed in tariff) rate should also be taken into consideration when deciding upon the solar clean frequency. Our personal experience is that residential solar installations require an annual clean, however agricultural solar fields are by far the dirtiest and will require a more frequent clean to maintain high returns. The cleaning costs are small in comparison to the increased return on investment.
We are one of the UK's leaders in agricultural solar panel cleaning and offer consultancy advice on cleaning frequency at your location. Contact us today to discuss your requirements.