Dust, salt air, heavy rain and bird droppings all shave output. A simple maintenance rhythm keeps production near spec.
Soiling losses in Mindanao typically run between three and seven percent per year on unwashed arrays, and much higher near unpaved roads or agricultural land.
Rain handles much of the cleaning during the wet months, but the dry season leaves a film that rain alone will not remove. Two professional cleanings a year is the practical baseline.
Coastal installations should also have mounting hardware inspected annually for salt corrosion, and every DC connector torque-checked.
Monitoring matters more than cleaning. A remote monitoring plan flags underperforming strings within days rather than at the end of a billing cycle.
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