Why Birds Are Attracted to Solar Panels

If you have noticed birds congregating around your solar panels, or heard scratching and movement from the roof, the space between the panels and the roof surface is almost certainly the reason.

That gap, which is typically between 100 and 200 millimetres depending on the racking system used, provides birds with almost ideal nesting conditions. It is sheltered from wind and rain, elevated off the ground and away from ground predators, warm due to heat from the panels, and rarely disturbed by humans. For pigeons and Indian mynas in particular, which are the two species most commonly associated with solar panel nesting in coastal NSW, this combination of features is highly attractive.

The Central Coast's environment makes this problem more prevalent than in inland areas. Proximity to national park and coastal waterways means a higher baseline population of birds in suburban areas. Larger established trees in residential areas provide resting points from which birds survey potential nesting sites. Once one bird establishes under a panel array, others follow quickly.

Figure 1: Bird Species Commonly Found Under Solar Panels on the Central Coast

What Damage Birds Cause Under Solar Panels

The damage from birds under solar panels is often underestimated because it develops gradually and is hidden from view. By the time it becomes obvious, the situation has usually been progressing for some time.

Wiring damage

Solar panels are connected by DC wiring that runs beneath the panels along the roof surface. This wiring has a UV-stabilised coating but is vulnerable to physical damage. Birds nesting under panels peck at wiring, strip insulation to use as nesting material, and deposit droppings that are highly corrosive to exposed metal components. Damaged wiring is both a performance issue and a fire risk.

Debris and fire risk

Bird nests are made of dry organic material: twigs, leaves, grass, feathers and other combustibles. Under a solar panel, this material is in close proximity to electrical components and, in summer, in a warm enclosed space. Nest material under panels is considered a fire risk by insurers and fire safety professionals, and is particularly relevant on the Central Coast given the regional bushfire risk environment.

Panel soiling and performance loss

Birds nesting under panels use the panel surface and roof area around the array as a perching and toileting area. Bird droppings on panel glass are one of the most damaging soiling types because they are concentrated, acidic, and create hot-spot shading that reduces the output of the affected cell disproportionately.

Roof cavity access

Depending on how the solar racking system interfaces with the roof, birds that establish under the panels can sometimes find access into the roof cavity itself. Once birds or other pests are in the roof space, the remediation involves pest control, debris removal and potential repair to insulation.

Before bird-proofing is installed, the panels and surrounding area should be properly cleaned. Learn about our solar panel cleaning service and how we prepare the array before proofing is applied.

Figure 2: Bird Damage to Solar Panels: What to Look For

How Bird-Proofing Solar Panels Works

The standard approach to bird-proofing a solar panel array is to install a mesh or clip system that seals the gap between the outer edge of the panels and the roof surface, preventing birds from accessing the cavity underneath.

Mesh systems

A UV-stabilised metal or polymer mesh is cut to fit the perimeter of the solar array and attached using a clip system that connects to the panel frame or the racking without drilling into the panels themselves or the roof. This is important: any bird-proofing method that requires drilling into the panel frame risks voiding the manufacturer warranty.

The mesh is sized with apertures small enough to prevent even small birds from squeezing through, while still allowing airflow beneath the panels, which is important for panel cooling and performance.

Clip systems

The clips used to attach the mesh to the panel frame are specifically designed for this application. They grip the panel frame securely without creating pressure points that could damage the frame over time. The clips are typically stainless steel or UV-stabilised polymer to handle the outdoor conditions and temperature cycling.

What happens before the mesh goes on

If birds have already been nesting under the panels before the proofing is installed, the nest material needs to be removed and the area cleaned before the mesh is fitted. Installing mesh over an active or recently vacated nest traps the debris and any existing droppings under the panels, which creates a continued fire and hygiene risk.

A professional bird-proofing installation should always include removal of existing nest material and a clean of the panel undersides and roof surface before the mesh is fitted.

Figure 3: Bird-Proofing Solar Panel Installation: What the Process Involves

What to Look For in a Bird-Proofing Product or Service

Not all bird-proofing products and installation services are the same. When evaluating your options, these are the things that matter.

• UV stabilisation: mesh and clips exposed to the Australian sun need to be UV stabilised or they become brittle and fail within a few years. Ask about the product's UV rating and expected service life.
• No drilling policy: any installer who proposes to drill into the panel frame to attach the mesh should be declined. This approach risks voiding your manufacturer warranty and is unnecessary when proper clip systems are used.
• Nest removal included: if you have existing nesting activity, confirm that debris removal and cleaning are included before the mesh goes on, not skipped to save time.
• Insurance: the installer should hold public liability insurance appropriate for roof access work.
• Warranty on the installation: a reputable installer will provide some form of warranty on their installation against mesh detachment or gap formation.

Is Bird-Proofing Worth the Cost

For most Central Coast homeowners with solar panels and visible bird activity, the answer is yes.

The cost of bird-proofing an average residential solar array is typically a few hundred dollars depending on system size and the extent of existing nest removal required. Set against the cost of wiring repair, which can run into thousands of dollars for a full DC wiring remediation, or the cost of a roof cavity pest treatment and clean-out if birds gain access below, the investment is straightforward.

There is also the panel performance consideration. A panel array that is regularly fouled by droppings from perching birds performs at lower output than a clean, proofed array. The ongoing output loss from an unprotected array in a high bird-activity area adds up over time.

The most practical test is simple: if you can see or hear bird activity around or under your panels, the problem is established and will not resolve on its own. Acting early, before a nesting season embeds the birds more firmly, is always cheaper than addressing an entrenched problem.

Even without birds, panel soiling from coastal conditions reduces your system's performance. Read our article on how dirt affects solar panel energy output to understand the full picture of what is affecting your output.

Frequently Asked Questions

Q: Can I install bird-proofing mesh myself?

DIY bird-proofing kits are available, but the main risk is achieving a correctly fitted seal without gaps and without damaging the panel frame or voiding the manufacturer warranty. If the mesh is not correctly fitted with appropriate clips, birds will find the gaps quickly. For most homeowners, professional installation provides better long-term results and covers the nest removal and cleaning steps that the DIY approach typically skips.

Q: Will bird-proofing affect my solar panel warranty?

Bird-proofing installed using the clip system, which does not require drilling into the panel frame, should not affect your manufacturer warranty. If in doubt, check with your panel manufacturer or installer before any bird-proofing work is carried out. Ask your bird-proofing operator specifically whether their installation method has been reviewed against common panel manufacturer warranty terms.

Q: What happens to birds that are already living under the panels?

Nesting material is removed and the area is cleaned, which disturbs the nesting site. Adult birds are not harmed: they relocate once the cavity is no longer accessible. Native bird species in Australia are protected under state and federal legislation, so physical interference with active nests containing eggs or chicks requires care and should be discussed with your installer. The timing of the installation matters: proofing before nesting season begins is simpler than intervening once eggs have been laid.

Protect Your Investment Before the Nesting Season

Solar panels represent a significant investment in your home and your energy costs. Birds nesting under them introduce a set of risks, from wiring damage to fire hazard to performance loss, that are genuinely costly to remediate once they are established.

On the Central Coast, where bird populations near parks, waterways and bushland are high and active year-round, solar panel bird-proofing is not an optional extra for homes with visible bird activity. It is maintenance that protects a system worth protecting.

If you have noticed birds on or around your panels, the best time to act is before they have established a nesting site. The second best time is as soon as you have noticed them.