Silver Trail, also listed as Walkabout Creek, sits off West Mason Creek Street with open ground to the west. Arrays here take wind-blown soil rather than urban grime, and the roof slopes vary considerably across 172 homes, which matters more than people expect.
A steeply pitched array sheds a useful amount of dust when it rains, because water runs off fast and carries loose material with it. A low-slope array holds water, and held water evaporates in place and leaves its mineral behind rather than running off. So two Silver Trail homes with identical panels and identical dust exposure can have very different soiling, purely because of pitch. Low-slope arrays need cleaning more often, and they are the ones where sprinkler overspray does the most damage.
Open ground to the west means soil arrives on the prevailing afternoon wind, and every lot here runs on untreated Boise-Kuna canal water carrying suspended silt and dissolved mineral. Where overspray reaches an array, the mineral cements that wind-blown soil onto the glass as it dries in the sun, producing a bonded film rather than loose dust. That will not rinse off with a hose, and it is the version of soiling most likely to be mistaken for panel degradation.
Panels get flooded with pure deionized water, which has had its dissolved solids stripped so it lifts soiling away and dries leaving nothing behind. Nothing abrasive touches the glass, because the anti-reflective coating on a panel is what makes it perform and scratching it costs output permanently. No soap either, since soap residue attracts the next round of dust faster than clean glass would.
Solar panel cleaning is quoted by array size, and we look at how the array is mounted and how it is accessed before giving a number. The reliable way to decide whether you need it is your own monitoring data: output below the same month last year with no equipment fault points to soiling. On a low-slope array beside open ground, that is usually what it is.
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Roof pitch, most likely. A steep array sheds loose dust when it rains; a low-slope array holds water that evaporates in place and leaves its mineral behind. Identical panels with identical exposure can soil very differently purely because of slope.
Partly, on a steep array. On a low-slope array rain is closer to a problem than a solution, because the water sits, evaporates and leaves mineral behind rather than running off and carrying dust away with it.
Because canal mineral has cemented the wind-blown soil onto the glass as it dried in the sun, so it is a bonded film rather than loose dust. Hose water also leaves its own mineral as it dries, which adds to the shading rather than removing it.
It could, which is why bonded soiling is worth ruling out first. Soiling is reversible and degradation is not, and cleaning is considerably cheaper than replacing panels. If a clean does not restore output, that points at the equipment.
By array size, after we look at how it is mounted and accessed. A low-slope roof array, a steep one and a ground mount are different jobs even at the same panel count, so a flat per-panel rate would be wrong for most installations.
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