Solar Panel Cleaning in Fort Worth

We clean panels with pure water and a soft brush, never a pressure washer. Fort Worth water is treated surface water and it's hard, roughly 6 to 10 grains a gallon, so it flashes dry into a mineral haze on hot glass before you can wipe it. We run ours through a deionizing resin bed until it reads near zero TDS. That rinses off and dries clear.

The brush is a soft monofilament head on a carbon fiber water-fed pole. It reaches most one and two story arrays from the ground. Where an array sits too far back from the eave to reach, we work off the roof surface. Nobody stands on your modules, and no ladder leans on the frames.

Hardened bird droppings get soaked and left to dwell, then brushed off. Never scraped. The anti-reflective coating on the cover glass is about a hundred nanometers of porous silica, well under a thousandth of a millimeter, and a scrub pad takes it off for good. Where there's a greasy film we use a pH-neutral surfactant. No ammonia, no alkaline degreaser, no solvent.

We work early morning or at dusk. A module on a Fort Worth roof in July can run north of 150 degrees, and module makers' own cleaning instructions say to wash when the glass is cool. Cold water on glass that hot is a thermal shock risk, and it flash-dries into spotting before you can rinse it off.

Then we clear the gap between the panels and the shingles, where oak catkins and cedar debris pack in. And we look the array over while we're up there. MC4 connectors, conduit straps, critter guard, hail pocks, snail trails, any browning in the laminate. We look and we photograph. We don't touch wiring.

Soiling doesn't cost you output evenly. The cells in a panel are wired in series, so the dirtiest cell throttles the current for every cell on its substring. When the mismatch gets big enough, a bypass diode shunts around that substring entirely. One solid bird dropping can cost you the substring it's sitting on, roughly a third of a conventional 60-cell module, about half that on the half-cut designs standard on newer installs.

The more expensive case is the one the diode doesn't catch. A pollen film or a thin smear holds one cell below its neighbors without the mismatch ever getting big enough to trip the diode. That cell gets driven into reverse bias and works like a resistor, turning the string's current into heat. That's a hot spot. Enough Texas summers of it cooks the encapsulant and scorches the backsheet, and that's damage, not just a lower number in the app.

Then there's the roof under the array, which is the part of your roof nobody looks at. Leaves and nest material pack into the four to six inch gap between the modules and the shingles and stay damp up there, and damp shade on a shingle is how a roof starts streaking black. Nothing rinses it out from above and you can't see it from the ground. Clearing it is part of the wash.