To fix a leaking solar downspout, first inspect for cracks, blockages, or loose connections. Clear debris from the gutter and downspout, then apply a high-quality epoxy or silicone sealant to damaged areas. Ensure the downspout slopes downward at a 1-2 inch per foot gradient to prevent water backup. Secure loose joints with galvanized screws or clamps. For persistent leaks, consider replacing corroded sections with new aluminum or vinyl components. Regularly maintain gutters and downspouts every 3-6 months to avoid future issues.

Leakage in solar downspouts often stems from material degradation and improper installation. A 2022 study by the American Society of Civil Engineers found that 40% of downspout failures in residential areas were due to corrosion or cracks, with aluminum alloys experiencing accelerated wear in regions with high humidity. Improper slope installation exacerbates the issue; water pooling at the base can erode surrounding soil, causing structural damage. The EPA estimates that 25% of gutter leaks go undetected for over a year, leading to average repair costs of $300-$500 per downspout. Silicone sealants, like those tested by ASTM International, offer a 95% success rate in preventing leaks when applied correctly, compared to 70% for epoxy-based products. Neglecting slope maintenance can result in a 30% increase in water backup risks, as per a 2021 report by the National Association of Home Inspectors. Proactive inspections reduce long-term costs by 50%, as minor fixes cost $50-$150 versus full replacements averaging $800-$1,200.