Glossary
Shading
In solar, shading is any obstruction (trees, chimneys, vents, neighboring buildings, antennas) that blocks part of the light on the panels during the day. Its effect is not proportional: with a string inverter, partial shade on a single panel can reduce the output of the entire string. It is quantified during the site survey with shade analysis tools, not by looking.
What shading means in a solar system
A panel is made of cells wired in series. If part of it is shaded, that part stops producing and also chokes the current from the rest, like a kinked hose. Modern panels have bypass diodes that limit the damage, but the loss is still larger than the shaded area. And if the panel belongs to a string connected to a string inverter, the whole string drops to the pace of the weakest panel.
Microinverters and optimizers solve part of the problem by letting each panel work independently. But they do not create sunlight: a panel under a tree will still produce little.
Why it matters in Florida
Shade here is dynamic. Palms and oaks grow fast, you do not control the neighbor’s vegetation, and the winter sun rides lower and casts longer shadows exactly when days are shortest. A home with no shade in July can have panels covered at 3 p.m. in January.
That is why serious analysis uses tools that simulate the sun’s path through the entire year (horizon imagery, lidar or 3D models) and report each panel’s solar access percentage. That number belongs in the design.
Common mistake
Taking “there is no shade there” from a salesperson who came at noon in summer. Ask for the per-panel solar access report from the site survey. If a panel group has low access, ask whether it should be moved, dropped, or whether trimming helps (and if trimming depends on the neighbor, do not count on it). When shade justifies microinverters is covered in string inverters vs microinverters.
Full guide: String inverters vs microinverters: which one belongs on your roof →
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