The conversion of light to electricity by photovoltaics is a pure numbers game. The more area of solar panels you have, the more electricity you can generate. But with the accumulation of dirt, dust, bird droppings and the like on PV panels, the PV power loss increases. In EcoGeneration’s October issue (P28) Fulcrum3D’s Colin Bonner looks at soiling losses – one of the largest uncertainties in a system yield assessment that’s rarely quantified – and how the industry’s adoption of IEC 6172-1:2017 is changing that.