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Site fit / access and operating conditions

READ THE GROUND BEFORE DEPLOYMENT

Large installations are not uniform work surfaces. A site plan needs to connect array geometry, access and local operating conditions to the specific cleaner, crew and maintenance route.

Use the survey prompts

A map is only the beginning

Drawings can show row spacing and block boundaries; a walk-through or other appropriate site review helps establish what those drawings do not. Ground can change, routes can become obstructed, and an array may include repairs or variations introduced after the original plan. Before planning autonomous cleaning, make sure the available layout information reflects the working site and that the people who will operate and recover equipment can explain the route.

A useful survey looks at more than whether a machine fits between module edges. It asks how the cleaner arrives, where it starts, what happens at row ends, how it moves between blocks and how staff respond to interruption. It also checks whether cleaning is justified under site conditions and whether the proposed method follows module and equipment guidance.

Walk the operating route

Field prompts

Layout and geometry

Record relevant module arrangements, row lengths, gaps, edges, inclination and frame features. Identify changes between blocks rather than assuming one sample represents the entire site.

Access and handling

Confirm vehicle and pedestrian routes, loading points, safe handling, storage and access to each work area. Decide how the crew reaches a stopped machine without creating a new hazard.

Obstacles and exclusions

Mark cables, junction boxes, repairs, drainage features, vegetation, loose material and other objects that may affect travel. Define no-go areas and a way to communicate changes to each shift.

People and handoffs

Name who authorises the work, supervises it, stops it, receives findings and checks the machine back in. Clarify how contractors and site operations share updates.

Weather, water and soiling

Solar technician walking between utility-scale panel rows in natural light

Local conditions affect whether a pass is appropriate and what method is reasonable. Consider deposit type and distribution, recent rain, dew, wind, temperature and the expected working window. Loose dust, adhered residue and biological material are not identical cleaning problems. A dry brush that is acceptable for one routine situation may not be a sound response to another deposit or weather condition.

Where water is proposed, establish permitted sources, quality requirements, access, use controls and runoff arrangements. Availability alone does not establish suitability. Follow site rules and applicable environmental conditions, and avoid assuming that a wet method is warranted simply because it can be arranged. If the conditions fall outside written equipment or module guidance, pause and resolve the uncertainty before work.

Operational readiness checklist

Choose a method from evidence

Situation to examinePlanning considerationPossible next step
Localised visible soilingExtent, deposit and safe accessCompare a targeted inspection or intervention with a broad routine pass.
Repeated dry depositionPattern, timing, approved contact method and route repeatabilityAssess a supervised autonomous trial with clear stop criteria.
Unusual residue or uncertain surfaceModule instructions, cleaning restrictions and material compatibilitySeek guidance before selecting a contact or liquid method.
Restricted access or difficult terrainTransport, slope, safety, recovery and staff exposureReconsider scope and compare with another approved maintenance approach.

Make the plan resilient to change

A deployment plan should make it easy to stop when reality differs from the survey. Identify the person with authority to pause work and the conditions that trigger review: a route obstruction, unexpected surface condition, equipment fault, weather change or uncertainty about module compatibility. A cautious hold can preserve safety and record quality better than pressing on to meet an arbitrary schedule.

After the first work cycle, compare planned routes with actual access, exceptions and crew feedback. Revise maps and instructions when the site changes. Treat the plan as a living operations document rather than a one-time approval. Retain enough detail for the next crew to understand what was done and why a particular area was excluded.

A site-first approach may show that automation is suitable for a defined subset, that another method better fits a difficult block, or that no cleaning is needed at that time. Each is a legitimate operational conclusion when it follows from site evidence, guidance and clear responsibilities.

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