Solar Trackers are used to orient the solar panels towards the sun as it moves across the sky. Therefore, trackers give 20-40% higher energy yield than that of the fixed solar panel systems.
However, due to the mechanical complexity of solar trackers the maintenance is more challenging than that of the fixed title solar panel systems.
In this blog, we will understand the common maintenance issues associated with the solar trackers and the smart maintenance strategies that can run the solar trackers at full capacity.
Why Solar Tracker Maintenance is Critical
Solar trackers have dynamic structures as they have to follow the Sun’s path. Therefore, all the mechanical and electrical components such as motors,actuators and sensors have to move along.
Improper maintenance of the solar tracker can cause the following problems-
Generation losses due to tracker misalignment
High downtime can cause the ROI losses
Improper maintenance can accelerate the degradation of the system
Regular maintenance of the solar tracker system will prevent the energy loss and ensure a longer equipment lifespan.
Common Solar Tracker Maintenance Issues
Here are the common solar tracker maintenance issues associated with the solar tracker.
Issue | Primary Cause | Recommended Solution |
Stuck Trackers | Motor burnout, actuator jamming, or control failure due to dust or poor lubrication | Implement preventive lubrication, monitor actuator current draw, replace faulty actuators, and recalibrate the control system |
Misalignment | Sensor drift, calibration errors, or mechanical displacement from wind or vibration | Conduct quarterly sensor calibration, realign with inclinometer readings, and log data in SCADA; use AI-based auto-calibration |
Communication Loss | Damaged cables, poor RF signal, or interference between controllers and central system | Adopt RF-based mesh communication with redundancy; test and secure cables to prevent interference |
Structural Corrosion | Moisture exposure, poor galvanization, or inadequate coating protection | Perform bi-annual anti-corrosion inspections; reapply protective coatings and use weather-resistant materials |
Wear & Tear | Continuous movement, dust ingress, load stress, and inadequate preventive checks | Deploy predictive maintenance tools, monitor vibration/torque trends, and schedule timely part replacements |
Strategies for Efficient Maintenance of Solar Trackers
Solar Trackers are becoming the most preferred type of the solar panels for the large power plants. Because of its operation complexity, it is necessary to understand the smart maintenance strategies.
Here are some of the proven strategies for the efficient maintenance of the solar trackers.
Smart Predictive Maintenance
By using AI and IoT, the early stage component failures can be detected. The AI algorithms can help to analyse the sensors inputs and signal the possible mechanical failures.
Along with the smart predictive maintenance for solar trackers, routine preventive maintenance should also be done.
Creating a holistic checklist and executing all the predictive maintenance actions will ensure the consistency in the maintenance efforts.
Also, it is necessary to enable the alerts through SCADA or central monitoring systems.
Maintain a Strategic Spare Parts Inventory
Broken devices or components can cause a significant loss and increase the downtime. It is important to keep on site spares for faster repairs.
What to Stock:
Actuators and motor units
Orientation sensors and encoders
Tracker controllers / communication modules
Batteries for tracker control units (if off-grid)
Cables, connectors, and mounting accessories
Schedule Regular Inspections
Visual on site inspection is necessary. It allows us to spot the issue that sensors might miss. Therefore it is necessary to schedule regular inspections based on the size of the plant and the resources available.
Following are the best practices of the regular inspections-
Conduct monthly on-ground inspections to detect physical issues like cracks, corrosion, or dirt buildup that sensors might miss.
Cross-check inverter performance logs with physical panel conditions to ensure energy loss isn't due to soiling or shadowing.
Perform thermal imaging scans quarterly to detect hotspots, faulty connectors, or early signs of panel degradation.
Inspect cleaning robots for wear, alignment issues, and battery or wheel damage, especially after high dust or monsoon seasons.
Validate sensor calibration (irradiance, temperature, etc.) every 6 months to ensure accuracy of system analytics.
Check for rodent or cable damage in junction boxes and combiner boxes to avoid electrical faults or fire hazards.
Review grounding, earthing and lightning protection systems during every inspection cycle for seasonal wear.
Keep photographic logs of all anomalies observed during site walks to build a maintenance history and track recurring issues.
Align inspection frequency with site conditions—plants near deserts, cement plants, or coastlines may need more frequent checks.
Ensure O&M staff follow SOPs for each inspection, with clear checklists and escalation paths for reporting defects.
Key Takeaways
Solar trackers increase yield but require higher maintenance due to their mechanical complexity.
Common issues like stuck actuators, misalignment, or communication failure can cause significant energy losses.
Smart strategies—predictive maintenance, routine inspections, and spare part readiness—help reduce downtime.
Training staff and using IoT-based monitoring ensure quicker response and long-term tracker health.
FAQs
Q1. How often should solar trackers be serviced? Trackers should undergo monthly visual inspections, quarterly sensor calibration, and bi-annual structural and anti-corrosion checks. Plants in dusty or coastal environments may need more frequent intervals.
Q2. What is the most common cause of tracker downtime? Stuck actuators due to poor lubrication or motor burnout are among the top causes, followed by sensor drift and communication failures between controllers and the central SCADA system.
Q3. Can AI really predict tracker failures before they happen? Yes. AI algorithms analyse real-time sensor data such as current draw, vibration, and torque trends to flag early signs of mechanical failure, allowing O&M teams to act before a breakdown occurs.
Q4. What spare parts should always be kept on-site for solar trackers? Critical on-site spares include actuators, motor units, orientation sensors, tracker controllers, communication modules, and spare cables and connectors for fast repairs with minimal downtime.
Q5. How does tracker misalignment impact energy generation? Even a small misalignment can reduce the panel's effective sun exposure, leading to measurable generation losses. Regular inclinometer-based recalibration and SCADA logging help catch and correct drift early.
