Single-axis trackers, bifacial modules, fixed-tilt ground mount and agrivoltaic sites each change how an array has to be cleaned. Drone soft-wash handles all four the same way — from above, touchlessly — which is exactly why row pitch and tracker position stop being access problems.
Single-axis trackers
Trackers defeat ground equipment in two ways: the modules move, and the torque tube and drive hardware sit right where a brush rig wants to pass. A cleaning plan for a tracker site has to be coordinated with the tracker controller — agreeing a stow or cleaning position per block, then holding it while that block is worked.
- Cleaning position agreed with your O&M team per block, not improvised
- No equipment driving between rows, so drive hardware and torque tubes are never in the way
- Flown passes follow the row geometry at whatever angle the block is held at
- Blocks released back to tracking as each one completes
Bifacial modules
Bifacial modules earn part of their output from light reflected off the ground onto the rear face, which makes two things matter that do not matter on a monofacial site: the rear surface itself, and the ground albedo underneath. Rear-side soiling is usually lighter and patchier than front-side — splash-back, dust kicked up from below, and bird activity under the rows. It also tends to be ignored entirely, because nobody looks under an array.
We treat the front face as the primary pass and assess rear-side condition and under-row ground cover as part of the site walk, then say plainly whether rear-side work is worth doing on your site rather than selling it by default.
Fixed-tilt ground mount
The simplest geometry and the one where conventional brush rigs are genuinely efficient — on wide, flat, dry rows. Where fixed-tilt sites get hard is soft ground after rain, tight row pitch, sloped terrain, or an owner who does not want abrasive contact on the coating. Those are the sites we take.
Agrivoltaic and dual-use sites
Where crops, grazing or pollinator habitat sits under and between the rows, driving a cleaning rig through is either impossible or destructive. Flying the pass leaves the ground undisturbed. Our cleaning solution is biodegradable and applied at low pressure, which is the right starting point over planted ground — and we will review the specifics with you for the crop or livestock in question before we mobilize.
| Method | Contact with the glass | Downtime | Where it struggles |
|---|---|---|---|
| Drone soft-wash (ours) | None — nothing touches the module | None; the array keeps running, or we fly at night | Very high wind; sites with no water access |
| Tractor / vehicle-mounted brush rig | Rotating brush on the glass | Row access needed; rig has to fit the row spacing | Tight row pitch, soft or wet ground, uneven terrain, trackers mid-travel |
| Hand crews with poles and brushes | Brush and pole contact | Slow; crews walking the array for days | Labor hours, heat exposure, module-walking risk, inconsistent coverage |
| Fixed / robotic rail systems | Brush contact, permanently installed | None once installed | Capital install per row; retrofit rarely pencils |
Rooftop, carport and canopy arrays
Commercial rooftop arrays bring their own constraint: the roof. Walking a roof to clean an array puts foot traffic on a membrane or on tile, and on a hot day it puts crews on a hot roof next to live DC. Flying the pass avoids both. We often clean these alongside roof cleaning or facade cleaning so the building gets done in one mobilization. Smaller rooftop and residential systems are covered on our solar panel cleaning page.
Frequently Asked Questions
Can you clean single-axis tracker arrays?
Yes. We agree a cleaning or stow position per block with your O&M team, work that block, then release it back to tracking. Because nothing drives between the rows, drive hardware and torque tubes are never an obstruction.
Do bifacial panels need the back side cleaned?
Sometimes, and far less often than the front. Rear-side soiling is usually lighter and patchier — splash-back, dust from below, bird activity under the rows. We assess it on the site walk and tell you whether it is worth doing on your array rather than charging for it as a default.
Can you clean arrays a tractor or brush rig cannot reach?
That is the main reason owners call us. Tight row pitch, soft or uneven ground, sloped terrain, trackers mid-travel, planted ground under the rows — none of it obstructs a pass flown from above.
Does cleaning disturb crops or livestock at an agrivoltaic site?
No equipment drives the rows, so the ground stays undisturbed. The cleaning solution is biodegradable and applied at low pressure; we review the specifics for your crop or livestock before mobilization.
Do you clean commercial rooftop solar?
Yes, and without putting crews on the roof. That protects the membrane or tile and keeps people away from live DC on a hot roof. It also pairs naturally with roof or facade cleaning in a single mobilization.
