Panels make less power when they’re dirty, and Central Oregon is hard on them. Our commercial solar panel cleaning covers building rooftop arrays, carports, and ground-mount solar farms across Bend, Oregon, using purified water and no abrasives so the glass and any coating come out untouched.
Cleaning a home system?
Home solar, rooftop or ground-mount, has its own page. See residential solar panel cleaning in Bend.
For businesses and commercial arrays
Rooftop arrays on offices, warehouses, and light-industrial buildings collect the same film, plus whatever the site itself throws off. A measurable output loss across a large array is real money over a billing year, and it’s the kind of thing that goes unnoticed until someone checks the production numbers against last summer.
Our commercial solar array cleaning runs on a schedule that fits your monitoring, and we file the visit so you have a record. Ground-mount and carport arrays are straightforward for us. Rooftop arrays we scope for access first.
Method
Purified water is the whole point. Tap water dries and leaves mineral spots that shade the cells and defeat the cleaning, so we run deionized water that dries clear. No soap, no detergent, and nothing abrasive, because panel glass carries anti-reflective coatings that harsh chemistry and scrubbing strip off. A soft brush and purified water lift the dust; the rinse carries it away.
The one thing worth saying plainly: a garden hose and a rag is how coatings get scratched and how people fall off roofs. The method matters more than it looks like it should.
The Central Oregon part
Our dry season is long, and it’s the reason panels here need cleaning more than they do in wetter climates. From roughly June to October the rain that would rinse a panel in Portland just doesn’t come, so dust builds and stays. Add pine and juniper pollen in spring and wildfire smoke and ash in late summer, and the layer gets thick enough to matter.
Late summer is when most systems have lost the most, which is why the practical time to book is around the end of the dry season, before the low winter sun makes every bit of output count. A once-a-year clean is the floor for a small building array; large commercial sites and anything near gravel lots, fields, or heavy traffic usually want it more often.
FAQ
Does dirt really cut how much power the array makes?
Yes, and it’s measurable. A film of dust and pollen shades the cells, and heavy buildup at the end of a dry Central Oregon summer takes a real bite out of output. Across a large array that adds up to real money over a billing year. Your production monitoring will show it.
How often should a commercial array be cleaned here?
Once a year is the minimum, timed for the end of the dry season. Ground-mount solar farms, sites next to gravel lots, fields, or heavy truck traffic, and anything downwind of its own operations usually want it two or more times a year. We’ll set the interval against what your monitoring shows.
Do your crews walk on the array?
No. We work from the ground with water-fed poles wherever the layout allows, which covers ground-mount and carport arrays outright and most low-slope building roofs. Where a rooftop array needs closer access, we scope it first and work with the right fall protection.
Why purified water instead of soap?
Tap water leaves mineral spots as it dries, which shade the cells and undo the clean. Soap leaves residue that attracts more dust and can attack the panel’s coating. Purified water dries clear and needs neither.
Will you damage the panels or void the warranty?
Not with this method. No abrasives, no high pressure on the glass, and no harsh chemistry, which is exactly what panel manufacturers ask for. We clean to protect the coating, not just the look.
Do you clean the panels while cleaning windows or the building exterior?
Often, yes. If we’re already on site for window cleaning or pressure washing, adding the array to the same visit saves you a second trip charge.
Related
Home solar panel cleaning · Commercial pressure washing · Window cleaning · Our work
Book a walkthrough
Half an hour at your property gets you a written scope and a flat price. No cost, no obligation.
Book a WalkthroughCall 541-604-7272
Serving Bend, Redmond, Sunriver, Prineville, Sisters, La Pine, Terrebonne and Tumalo.