Pigeons Under Your Solar Panels: Solar Panel Cleaning vs. Bird Guard (South Florida)

Pigeons under your solar panels are a two-part problem, and cleaning fixes only one part. Cleaning removes the droppings baked onto the glass and the debris under the array, which is what is costing you output today. A clip-on mesh guard around the perimeter of the array is what keeps the birds from coming back. In South Florida, where pigeons do not migrate and most roofs are tile, you usually end up needing both. Here is how to think about the order.

Why pigeons pick the gap under a solar array

The space between a rooftop array and the roof surface is a few inches high, shaded all day, dry in a storm, warm at night, and out of reach of hawks and cats. On a barrel-tile roof the ridges of the tile give a pigeon a foothold at the edge and a ledge inside. That describes most of the roofs in Parkland, Coral Springs, Coconut Creek, and West Boca Raton, which is where most of our bird questions come from.

Pigeons are year-round residents here, not seasonal, so this is not a spring problem that resolves itself. Once one pair settles in, the droppings and nesting material attract more. Iguanas use the same gap where they are already on the property, most often near canals and lakes, and their droppings are larger.

What the birds actually do to the array

Three things, in order of what they cost you.

Droppings on the glass. Pigeon droppings land on the panels below and around the roost, bake on in one afternoon of sun, and shade the cells beneath them. A panel with a dozen baked-on droppings is producing less, and because most residential arrays are wired in strings, one dirty panel can drag down the ones around it. Rain does not remove them.

Nesting under the array. Twigs, feathers, and droppings pack the gap. That blocks the airflow the panels rely on to shed heat, holds moisture against the roof, and on a tile roof can dam water where it should be draining.

What is left on the wiring. The cabling under a rooftop array runs through the same gap the birds are living in. We do not touch wiring and cannot tell you what it is doing; we can photograph the space and tell you what we see, so you know what to ask your installer about.

What cleaning fixes

A cleaning with deionized water and a soft brush takes the droppings off the glass and gets your output back. It also lets us photograph the space under the array, remove whatever nesting debris we can reach from the perimeter, and document what is there. On a heavy-bird roof that is a real improvement, and it is the right first step whether or not you go on to a guard.

What cleaning does not fix is the roost. Clean the glass on Monday and the same pigeons are back on Tuesday, because the gap is still open.

What only a guard fixes

A solar panel bird guard is a UV-resistant, PVC-coated mesh screen cut to the shape of the array and fitted around its open perimeter. It is held by clip fasteners sized to the panel frame. Nothing is drilled, nothing penetrates the roof, and the mesh never covers the glass, so airflow and drainage under the panels are unchanged. It is a clip-on mesh guard attached to the panel frame, not a change to the solar system. With the gap closed, the birds have nowhere to roost, and the droppings problem stops at the source.

Two things about guards worth knowing. The nesting debris has to come out before the perimeter is closed, or you are sealing it in. And many wild birds and their active nests are protected under federal migratory-bird rules; pigeons are not, but a look before closing anything up is the right practice.

What to do first, in South Florida

1. Get the glass cleaned and the space photographed. That recovers your output now and tells you how bad the roost is.
2. Decide on the guard with the photos in hand. A single visiting pigeon is a different situation from a year of nesting.
3. Put the roof on a schedule. Heavy-bird roofs do better on a quarterly cleaning plan whether or not a guard goes on, because the droppings that land on top of the array from birds on the ridge line keep coming.

The other birds

Not every dropping is a pigeon. On the lake subdivisions in Coral Springs, Deerfield Beach, and West Boca, ibis, Muscovy ducks, and egrets leave large droppings on top of the panels, not under them. On the water in Lighthouse Point, Coral Ridge, and Las Olas Isles it is gulls, pelicans, and cormorants. Those birds are not roosting under the array, so a guard does nothing for them; cleaning on a quarterly schedule is the answer. The photos tell you which problem you have.

If you hear cooing at dawn or see streaks running down the tile below your panels, send us the form or call (954) 872-1622. We will tell you plainly what is under there.