SOLAR PANEL CLEANING FAQ

Research from the National Renewable Energy Laboratory (NREL) shows arid-climate solar installations lose 1.5–6% efficiency per month from soiling. In high-dust Utah conditions, total annual efficiency loss from dirt can reach 15–25% without cleaning. On a system generating $150/month in electricity value, that's $22–$37 in monthly losses — potentially $270–$450 per year.

Our recommendations for Utah:

• Minimum: Once per year (spring, before peak summer generation)
• Recommended: Twice per year (spring + fall)
• High-dust areas (near agriculture, gravel roads, active construction): 3–4 times per year
• Commercial solar installations: Quarterly, given the direct financial impact of downtime

Not in Utah. Utah averages only 15–18 inches of rain per year, and much of it falls as light showers that wet dusty panels without flushing them — creating a mud film that bakes on in the intense Utah sun. Studies consistently show that rain alone does not maintain acceptable efficiency levels in arid climates. Mechanical cleaning is required.

For ground-mounted panels, DIY cleaning with a soft brush and purified water is safe and effective. For roof-mounted panels, the safety risks of working on a roof — combined with the technical requirements of using the right water and tools — make professional service the better choice for most homeowners. Falls from roofs during DIY maintenance are a significant injury risk.

We use:

• Deionized/purified water for rinsing — tap water leaves mineral deposits that reduce panel efficiency
• Soft brushes specifically designed for solar panels — gentle on anti-reflective coatings
• pH-neutral cleaning agents for stubborn deposits (bird droppings, hard water scale)

We never use pressure washers, abrasive materials, or harsh chemicals on solar panels.

Generally no — most manufacturers require regular cleaning to maintain warranty coverage. Neglect-related efficiency loss may not be covered. Some manufacturers specify approved cleaning methods; we follow manufacturer guidelines. We can provide documentation of completed cleanings for your warranty records.

For a typical residential solar installation (20–30 panels):

• Standard roof system: $150–$300
• Large system (40+ panels): $250–$450
• Commercial systems: Custom quote based on panel count and access

Annual maintenance contracts for twice-yearly service provide 10–15% discounts. Call (801) 999-8430 for a free quote.

Spring (March–April) is the highest priority — before peak summer generation season when every watt matters. Fall (September–October) removes summer dust buildup before winter. We recommend scheduling spring cleaning as early as possible since our schedule fills quickly as warm weather arrives.