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Solar-panel cleaning robot settings determine when a machine runs, whether it uses water, and where it must stop. The correct setup is model- and site-dependent: one robot may offer a fixed clock schedule or dust-triggered automation, while another may provide only repeat, position, or remote commands. Water use can be zero on a waterless design or hundreds of litres per hour on a wet machine. Before enabling any run, match the robot manual to the photovoltaic (PV) module manual, inspect the array for fall and electrical hazards, and create exclusions for every area the machine cannot safely cross.
This guide explains how to configure those decisions without assuming that a feature in one robot app exists in another. Model-specific figures and limits are linked to the manufacturer documents that publish them.
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What should you set before a solar-panel cleaning robot runs?
Start with four checks: the robot’s available control modes, the panel maker’s cleaning approval, the array’s physical limits, and the weather and surface condition on the planned run. Do not copy a schedule, water flow, slope limit, or geofence setting from another machine.
- Identify the exact robot and firmware/manual edition. Record the model, operating mode (dry, wet, or both), battery and water accessories, and the revision date of the manual. Documentation can change: Youhan Shoji identifies its RHINOSTAR EC6 user and after-sales manuals as July 2026 editions and notes that some text describes older specifications; its current pump and hose are optional accessories (Youhan Shoji documentation).
- Check module compatibility. AE Solar’s module manual says that any method requiring rotary brushes, robot cleaners, or string cleaners should first be discussed and verified with AE Solar. It warns that an uncertified device can abrade glass or an anti-reflection coating, or contribute to micro-cracks through weight and vibration (AE Solar installation manual). Treat that as module-maker guidance for AE Solar products, then obtain equivalent written guidance for your own modules.
- Map the array physically. Note panel tilt, gaps between tables, parapets, skylights, cable runs, drains, fragile roof areas, and every unprotected edge. A software boundary cannot prevent a machine from crossing a gap that the robot cannot detect.
- Choose safe operating conditions. Follow the robot’s wind, rain, temperature, irradiance, frost, and visibility limits. AE Solar recommends cleaning at low irradiance and low module temperature, and says not to clean when frost is a risk.
Only after these checks should you configure a recurring run. If the manual does not document an app menu, virtual wall, or map function, assume that feature is unavailable until the manufacturer confirms it.
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How often should I run my solar panel cleaning robot?
There is no evidence-based universal daily, weekly, or monthly interval that applies to every array. Dust load, pollen, bird residue, rainfall, tilt, nearby construction, and the robot’s brush or washing method all change the result. Use the interval or trigger that your machine supports, then adjust it from site observations and the manufacturer’s operating guidance rather than from a generic calendar.
Fixed-time schedules
A fixed-time schedule starts a run at specified days and times. Aegeus lists a TIME mode for fixed schedules on its Unicorn water-free robot (Aegeus Unicorn product page). This approach is predictable for a controlled site: schedule only when the array is cool, access is clear, and no workers are in the exclusion area. Confirm whether the clock uses local time, whether daylight-saving changes are handled, and what happens after a power or network outage; the cited product page does not establish a common behavior for all robots.
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Dust-triggered automation
Aegeus also describes an AUTO mode that starts cleaning from measured dust levels. A dust trigger can avoid unnecessary runs after rain or during clean conditions, but the threshold, sensor location, and calibration are model-specific. Verify how the robot reports a trigger and whether a failed sensor causes a safe stop instead of an automatic launch.
Repeated, position, and remote runs
Optonica’s single-panel robot datasheet lists one-time, repeated-time, positioning, and scheduled cleaning modes (Optonica 2023 datasheet). “Positioning” may mean sending the robot to a selected location rather than using a calendar; do not infer that it provides geofencing. Other machines may expose commands through a handset, remote, fleet console, or local controls. Use the interface named in your manual and confirm a stop, return, or pause command before the first unattended run.
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A practical scheduling decision
- Inspect soiling and weather records for the actual site.
- Choose the least frequent run that keeps the array within the module maker’s care guidance; the sources do not establish a universal production gain from a particular interval.
- Prefer a dust trigger when the model documents reliable dust measurement; otherwise use a fixed or repeated schedule with a human pre-run check.
- Block runs during frost risk, unsafe wind or rain, active maintenance, or any condition excluded by the robot or module manual.
- Review the first several cycles for edge stops, missed strips, residue, water pooling, and abnormal vibration, then revise the schedule or exclusions.
How much water does a solar panel cleaning robot use?
Water use is a property of the robot and selected cleaning mode, not a standard setting. A waterless brush-and-airflow machine may use no water; a wet-cleaning design can consume a specified flow continuously. Never convert one model’s flow figure into a target for another machine.
| Example | Published cleaning approach | Published water figure | What it means for setup |
|---|---|---|---|
| Aegeus Unicorn | Water-free brush and airflow, according to the manufacturer | Zero water claimed | Plan for dry-soiling limits, brush maintenance, and no hose or tank connection; the claim is vendor-published, not independently validated in the supplied sources. |
| Optonica single-panel robot | Wet cleaning specification | 330 L/hour at 0.3 MPa (Optonica, 2023) | Size supply, drainage, and water treatment for this named model only; it is not a general recommendation. |
AE Solar advises neutral-pH, low-mineral water, warns against chemicals and high-pressure hoses, and cautions against dry rubbing on its modules. Those instructions are specific to AE Solar’s module documentation, but they illustrate why the module manual can impose a stricter limit than the robot’s maximum pump setting.
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Dry, wet, and hybrid settings
- Dry mode: usually relies on brushes, airflow, or both. It avoids water logistics but may be unsuitable for sticky bird residue, oily deposits, or mud. A “water-free” claim does not prove that every kind of soiling will be removed.
- Wet mode: adds a pump, hose, tank, or site water connection. Confirm pressure, flow, filtration, drainage, and whether the robot requires a moving hose attendant. Stop if water can reach exposed electrical parts or pool at module frames.
- Hybrid operation: some systems support more than one method or optional accessories. Select the mode explicitly and verify that the slope, brush, pressure, and edge limits change with the mode.
For context, Aegeus publishes a Unicorn cleaning-rate claim of 1,800–2,000-plus panels per hour and runtime of three to four hours per charge. These are the manufacturer’s current product claims, not independently tested results. Runtime can change with slope, return trips, brush load, temperature, and any water equipment.
Can I set no-go zones on a solar panel cleaning robot?
Only if the specific model documents programmable exclusions. “No-go zone” can mean an app-drawn polygon, a virtual wall, a physical barrier, a position limit, or simply an operator rule. The reviewed manuals do not establish a universal mapping or geofencing feature, so treat software exclusion as optional and enforce physical exclusions regardless.
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Build the exclusion list from the site, not the app
Mark these areas before configuring software boundaries:
- Damaged, cracked, delaminated, or otherwise compromised modules.
- Exposed conductors, loose connectors, hanging cables, and damaged junction boxes.
- Unprotected roof or array edges, skylights, fragile coverings, and gaps wider than the robot can bridge.
- Panel rows or transitions outside the robot’s documented tilt, clearance, or geometry limits.
- Obstacles such as clamps, raised frames, drains, parapets, snow guards, and temporary tools.
- Areas occupied by workers, pedestrians, lifting operations, or other contractors.
- Any route where a fall, entanglement, water discharge, or collision could damage property or expose people to electrical danger.
AE Solar specifically says not to clean modules with damaged glass or exposed wires. Radiant’s user guide states: “Non-professional personnel are not allowed to operate the machine or enter the working area. Please keep a safe distance to prevent danger” (Radiant PV user guide). Use barriers and a controlled work zone even when an app shows a boundary.
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The Kwun-E22L manual permits up to 15° for dry brushing and 10° for washing. It also specifies an unobstructed 50-centimetre edge area and a minimum array clearance (Kwun-E22L manual). These are limits for that model, not a safe default for another robot. If your site exceeds a limit, create a hard exclusion or use a different approved method.
If the robot has no geofence
- Use the manual’s physical stop, tether, rail, bumper, or edge-sensor procedure.
- Place visible barriers at roof edges, gaps, and access points.
- Assign a trained operator to supervise every movement and keep the emergency-stop control accessible.
- Record the exclusion map in the site method statement and brief every person entering the work area.
What settings should I use for dry or wet cleaning?
Use the least aggressive method that the robot and module maker both approve. The exact brush speed, pressure, pass count, and water setting must come from the robot’s manual; the sources do not support a universal numerical recipe.
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Dry-cleaning checklist
- Confirm the module surface is cool and irradiance is low.
- Use only the specified brush material and contact pressure; AE Solar warns against dry rubbing and non-approved rotary devices on its modules.
- Set a conservative speed and single pass if the manual allows adjustment, then stop for glazing, squealing, vibration, or visible residue.
- Keep the machine away from cracked glass, exposed wires, loose frames, and unprotected edges.
- Inspect brush wear and trapped grit; abrasive particles can turn a soft brush into a scratching tool.
Wet-cleaning checklist
- Use only the water quality, pressure, and flow allowed by both manuals. AE Solar recommends neutral-pH, low-mineral water and says to avoid high-pressure water.
- Confirm the pump, hose, tank, and filtration accessories are the ones specified for the robot. Optional accessories may belong to a particular model or manual revision.
- Plan where runoff goes; do not direct water toward electrical equipment, roof penetrations, or people.
- Do not add detergent, solvent, or anti-static chemical unless the module maker expressly approves it.
- Stop for frost risk, unsafe weather, pooling, hose snags, or a loss of pressure that could cause erratic movement.
Manual-care tools are a fallback, not automatic robot accessories. AE Solar permits a soft cloth, sponge, or soft-bristle brush for stubborn dirt when the tool is non-abrasive to the relevant materials. That does not establish that a particular brush is suitable for attachment to a moving robot.
Can a cleaning robot damage solar panels?
Yes. Damage can result from abrasive grit, excessive pressure, weight and vibration, impact at edges, snagged wiring, high-pressure water, or operation over already damaged glass. AE Solar says uncertified rotary brushes, robot cleaners, or string cleaners may abrade glass or anti-reflection coatings and contribute to micro-cracks, and it requires discussion and verification before using such methods on its modules.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsCheck the module warranty and cleaning instructions before deployment. A robot approval for one panel series is not proof of compatibility with another series, glass treatment, frame design, or mounting system. Keep a pre-run record of cracked modules, cable condition, clamps, and edge protection so a later defect is not confused with pre-existing damage.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should happen when a run stops or fails?
Define a stop-and-recover procedure before scheduling unattended operation. The operator should know how to halt movement, isolate power or water, secure the machine against sliding, and retrieve it without stepping into an unsafe area.
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- Stop immediately for a fall alarm, edge approach, loss of traction, abnormal noise, cracked glass, exposed wiring, hose entanglement, sudden weather change, or a person entering the work zone.
- Use the documented emergency stop or return command. Do not pull a moving robot by its hose, cable, or brush assembly unless the manual expressly permits it.
- Isolate energy and water before clearing an obstruction. Treat PV conductors as live whenever light is present.
- Inspect the cause—surface contamination, obstacle, sensor fault, slope, battery, or boundary error—before restarting.
- Record the event and modify the schedule, route, or exclusion map. Repeated stops indicate a site-fit problem, not a reason to raise speed or pressure.
How do you verify a final configuration?
Use a supervised commissioning run, not an immediate unattended schedule. Start with the smallest safe section, observe the robot’s edge behavior and cleaning contact, and confirm that water (if used) drains safely. Verify that the emergency stop works, the battery or water supply lasts for the route, and the machine returns or parks where the manual says it will.
Keep a configuration record containing the robot model and manual revision, module model and approval, operating mode, schedule or trigger, water specification, slope and clearance measurements, no-go map, weather limits, responsible operator, and inspection date. Recheck it after roof work, panel replacement, firmware changes, or a change in cleaning accessories.
How to choose settings when documentation conflicts
Apply the stricter documented limit. If the robot allows a pressure that the module maker prohibits, use the module maker’s lower limit or do not use that method. If the robot manual is silent about a site feature—such as a parapet, gap, or anti-reflection coating—pause and obtain written guidance rather than assuming compatibility.
For a construction site, coordinate the robot plan with the project’s permit-to-work, fall-protection, electrical-isolation, and exclusion-zone procedures. The robot’s app is an operating aid, not a substitute for the site safety plan or the module warranty conditions.
Frequently Asked Questions
Can rain replace a scheduled cleaning run?
Not automatically. Rain may leave mineral spots or redistribute dirt, and the robot may have separate wet-weather restrictions. Check the machine’s weather limits and inspect the array before allowing the next cycle.
What should I do if my robot manual does not state a slope limit?
Treat the limit as unknown and do not extrapolate from another model. Ask the manufacturer for a written limit for the exact robot, brush or wash mode, panel geometry, and edge condition at your site.
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Is a dust sensor enough to decide when panels need cleaning?
A dust trigger is only one input. Confirm that the sensor represents the module surface, check for bird residue or sticky contamination that dust measurement may miss, and keep the module maker’s cleaning restrictions as the overriding condition.
How can I tell whether a water flow is too high for my modules?
Compare the robot’s pressure and flow with the module manufacturer’s written cleaning limits; do not use a generic litres-per-hour threshold. If the module documentation warns against high pressure or does not approve the robot, obtain clarification before connecting the pump.
