Sera Sole sits south at Swan Falls Road and Stagecoach Way, on the open side of Kuna where there is nothing much to shade a roof and nothing much to stop the wind. Kuna averages around 210 sunny days a year, and out here the arrays get all of them, along with continuously airborne fine silt.
With roughly 210 sunny days a year and no mature canopy anywhere near these roofs, a Sera Sole array has among the best production potential in the city. That cuts both ways: the same array has more absolute output to lose to soiling than a partly shaded one does, so a given percentage loss costs more kilowatt hours here than it would somewhere with less irradiance. Soiling losses scale with the production you would otherwise have had.
The airborne particle south of Kuna is fine high-desert silt, which spreads into a thin continuous film across the entire cell surface rather than sitting as scattered grains. A uniform film costs proportionally more production than the same mass of coarse particles would, because it shades everything rather than a few small spots. It is also almost continuously airborne rather than seasonal, so it re-establishes steadily instead of arriving in bursts.
Panels run hot in full sun, and Sera Sole panels run hot for a great many days a year. Where sprinkler overspray from untreated Boise-Kuna canal water reaches the array, that mineral dries onto very hot glass and sets far harder than the same deposit would on a shaded window. New landscaping here means heads set to throw high and wide, so overspray reaching a low-slope roof array is a genuine risk worth checking. We flood with deionized water and use nothing abrasive on the anti-reflective coating.
Solar panel cleaning is quoted by array size. The honest test of whether you need it is your own monitoring: output tracking below the same month last year with no equipment fault points to soiling, and out here it usually is soiling. We would rather you looked at the data than take our word for it, and if your figures say the array is fine we will say so.
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It raises the stakes. With around 210 sunny days a year and no canopy near these roofs, a Sera Sole array has high production potential, so a given percentage soiling loss costs more actual kilowatt hours than it would on a partly shaded array elsewhere.
Because it spreads into a thin continuous film across the whole cell surface rather than sitting as scattered grains, and a uniform film shades everything rather than a few spots. It is also continuously airborne rather than seasonal, so it rebuilds steadily.
It can, particularly on a low-slope roof, because heads set for new landscaping throw high and wide. Untreated canal water drying on very hot panel glass sets much harder than the same deposit on a shaded window, so it is worth checking whether yours is in the throw.
Hosing hot panels with cold water is a thermal shock risk, and hose water leaves mineral spots as it dries, which shade the cells. We flood with deionized water, which leaves nothing behind, and we work the array at a sensible time of day rather than in peak heat.
Your monitoring data. Output tracking below the same month last year without an equipment fault points to soiling, and out here it usually is. If your figures say the array is fine we will tell you so rather than selling you a clean you do not need.
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