700mm PBT Solar Panel Disc Brush

A 700mm PBT Solar Panel Disc Brush is a machine-driven rotary cleaning head built for solar panel arrays. It is not a hand brush: the 700 mm circular face mounts to a powered rotary deck, robotic cleaner, or motorized panel-cleaning carriage through a quick-change coupling, and the machine spins the disc while moving along the row.

The cleaning side is a circular mat of PBT filaments set into a 6061 aluminum base plate. Tuft rows and trim lengths can be arranged flat, wavy, or edged to match the panel surface, and the 50 mm head height keeps the assembly compact under the machine deck. During operation, the bristle tips sweep the tempered glass, coated module face, frame edges, and seam gaps while water or cleaning solution carries the loosened material away.

PBT is the load-carrying filament because it stays stable in wet outdoor service. Panel surfaces reach 60–90°C in direct sun, and the brush is used with continuous or intermittent water. PBT retains its stiffness and shape in that range better than many common polyamides, and it does not absorb enough water to sag or pack down. The result is a brush that runs through a shift without the deck needing re-trim or extra pressure to restore contact.

This is a surface-cleaning head for light-to-moderate soiling, not an abrasive stripper, paint remover, or heavy scale cutter. Use it with the water and detergent rates, machine speed, and contact pressure the panel manufacturer and machine builder specify for coated modules.

The diameter and coupling are the first fit points. If your machine has a different hub pattern, provide the drive drawing — we can build the same 700 mm face around your existing quick-change interface. Filament diameter, trim height, and tuft density can be re-specified for panel coating, water quality, and soil load.

• Utility-scale ground-mount and single-axis tracker arrays where cleaning machines move along long rows and need a wide, consistent pass.
• Commercial rooftop and carport systems with low-slope panels, module gaps, and aluminum frames that collect dust, pollen, and bird droppings.
• Dust-dominant regions, coastal sites with salt film, agricultural areas with pollen or dust crust, and desert environments where panels go days between mechanical cleanings.
• Machine-mounted cleaning systems — ride-on scrubbers, push rotary decks, and automated or semi-automated solar panel cleaning robots that accept a disc-style consumable.
• Light-to-moderate soiling on tempered glass and coated module faces, especially when the cleaning program uses water or neutral detergent.

Start with the machine interface

Confirm the quick-change coupling matches the drive hub or bolt pattern on your cleaning deck. The 700 mm diameter must also clear the machine body, splash guards, and row spacing. A disc that overlaps the module edge by 50–100 mm can clean seams but may drag on the frame; check the down-pressure path before ordering.

Choose filament diameter for the soil and surface

0.20–0.30 mm filaments are appropriate for light dust and pollen on newer or coated panels where surface mark risk must stay low. 0.35–0.50 mm filaments apply more tip pressure for dried bird residue, salt crust, and accumulated film, but they should only be used if the module coating and frame finish tolerate the higher scrub. When in doubt, start with the finer filament and test one panel section before fleet rollout.

Set trim length by machine clearance and panel flatness

A 20–25 mm trim gives firmer contact and faster soil release but follows less variation. A 30–35 mm trim rides over small height differences at module seams, mounting hardware, and tracker joints. Longer trim also reduces the chance that the aluminum base gets close to the glass when the deck moves over an uneven row.

Decide wet or dry, and match the PBT grade

The brush can run dry for light dust and pollen, but bird droppings, salt film, and atmospheric film need water or a neutral cleaner to release from the glass. If the machine runs continuous water, standard PBT is usually sufficient. For extended dry sweeping and high-UV desert sites, specify UV-stabilized PBT to delay filament embrittlement and breakage.

Know what this brush is not for

Do not use it as a substitute for cutting heavy mineral scale, dried construction residue, adhesive, or thick bird layer that has baked across the panel. Pre-treat or pre-wash heavily fouled panels first. If the surface has cracked glass or lifted laminate, repair before brushing. For ice or packed snow, use a soft squeegee or de-icing process — not the rotating disc.

The 700 mm disc is a standard diameter, but most order-level variables can be adjusted to fit the machine and the site. To define a custom configuration, provide the drive hub drawing or machine model, panel width and coating type, current filament diameter and trim length, cleaning chemistry, water flow and pressure, and expected daily cleaning area.

• Filament — PBT or UV-stabilized PBT, diameter 0.20–0.50 mm, trim length, and tip treatment
• Face layout — concentric rings, segmented sectors, full-face tufting, center open area for drain, edge bevel, or scalloped rim for seam access
• Base and hub — 6061 aluminum thickness, center bore, drive slot, pin pattern, quick-change lock style, or custom flange to mate with the existing machine deck
• Dimensions — 700 mm standard diameter, with the face re-trimmed within machine clearance; overall head height adjustable by hub design
• Marking and color — brand-color bristles, laser-marked or pad-printed base plate, part number for fleet identification
• Packaging — bulk pallet, individual perforated bags, boxed kits, or project-specific labels

If your project needs material declarations, inspection records, or third-party test support, those can be arranged as part of the customized order. Specify the requirement at RFQ so the brush is built and documented to your site acceptance plan.