Cleaning at London City Bond

Some sites present challenges for operation and maintenance, such as London City Bond where the panels are spread over such a large area. NWT have spent considerable time and investment identifying the best possible equipment for difficult circumstances like this. Our powered rotating brushes are the most effective way of removing dirt from solar panels in the world.

Cleaning at London City Bond


London City Bond has 250kW of solar PV spread across a vast area of its roof surface in blocks.  These mounts allow the panels to face South, which means that they will generate more electricity over the course of a year, and also mean that the clear roof sheets are left unobstructed.

This also makes them difficult to reach given the large distance from the edges.  Nonetheless NWT’s cleaning and maintenance unit were able to access all areas of the installation using dedicated 100m hoses attached to the rotating cleaning brush heads

Screen Shot 2018-05-10 at 15.48.13Over time, almost all solar panels will have accumulated a layer of dirt, but this happens more rapidly when they are mounted with a shallow pitch or positioned in a particularly dirty environment.  In this case the site is on industrial land in the Thames Estuary, which has quite a lot of airbourne dust and also suffers from higher-than-usual bird droppings.


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Using the QLEEN rotating brush system we were able to remove the entire layer of dirt and substantially improve the performance of the system – up in this instance by more than 10%.  Cleaning PV panels properly should be undertaken at least annually to ensure that you continue to receive the correct amount of income from your system.

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