Project description
Our rooftop photovoltaic array has accumulated dust, pollen, and bird droppings over the past several months, and the monitoring app shows a noticeable drop in daily output compared to the same period last year. We need an experienced solar panel cleaning technician to restore performance and confirm the improvement with real measurements, not just a visual wipe-down.
The array sits on a two-story asphalt-shingle roof and consists of twenty-four panels split across two strings. Cleaning must use deionized or reverse-osmosis water with soft, non-abrasive brushes or a squeegee designed for glass — no ammonia-based detergents, no pressure washer directly on the cells or frame edges, since high-pressure jets can force water past the seals and into the junction box. Please rinse from the top down so mineral streaks do not dry on the glass, and pay particular attention to the lower edge of each panel where bird droppings and leaf debris tend to collect.
Before starting, record the inverter output reading and take timestamped screenshots from the monitoring app for each string. After cleaning, take the same readings again so we have a documented before/after comparison. While cleaning, please also visually check for cracked cells, delaminated backsheet, discoloration, loose mounting clamps, and corrosion on the rails or grounding wires — flag anything that needs follow-up repair rather than fixing it without asking.
Since this work is performed on a pitched roof, a safety harness anchored to a proper roof anchor point and non-marking rubber-soled shoes are mandatory; we will not allow work without fall protection. The technician must carry liability insurance and provide proof before the start date. We expect the job to take one full day, or two if weather interrupts, and would like photo documentation of the panels before, during, and after cleaning, plus a short written summary of the output improvement and any maintenance recommendations.
The array sits on a two-story asphalt-shingle roof and consists of twenty-four panels split across two strings. Cleaning must use deionized or reverse-osmosis water with soft, non-abrasive brushes or a squeegee designed for glass — no ammonia-based detergents, no pressure washer directly on the cells or frame edges, since high-pressure jets can force water past the seals and into the junction box. Please rinse from the top down so mineral streaks do not dry on the glass, and pay particular attention to the lower edge of each panel where bird droppings and leaf debris tend to collect.
Before starting, record the inverter output reading and take timestamped screenshots from the monitoring app for each string. After cleaning, take the same readings again so we have a documented before/after comparison. While cleaning, please also visually check for cracked cells, delaminated backsheet, discoloration, loose mounting clamps, and corrosion on the rails or grounding wires — flag anything that needs follow-up repair rather than fixing it without asking.
Since this work is performed on a pitched roof, a safety harness anchored to a proper roof anchor point and non-marking rubber-soled shoes are mandatory; we will not allow work without fall protection. The technician must carry liability insurance and provide proof before the start date. We expect the job to take one full day, or two if weather interrupts, and would like photo documentation of the panels before, during, and after cleaning, plus a short written summary of the output improvement and any maintenance recommendations.
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