Proper solar traffic sign maintenance helps you avoid breakdowns that tend to strike during storms, heavy snow, and thick fog. These severe‑weather moments are exactly when road visibility is at its lowest and traffic guidance facilities are most crucial.
If the sign suddenly loses power and fails, it will significantly increase the risk of secondary traffic accidents on the road, and also trigger compliance penalties and legal lawsuits. The more direct cost loss lies in the fact that the cost of emergency repairs is 3‑5 times that of regular planned maintenance.
Many maintenance teams have long been trapped in the passive mode of "fixing when broken", seemingly saving maintenance time on a daily basis, but actually continuously bearing high emergency costs and safety risks.
Targeted preventive maintenance of solar traffic signs is the key to breaking the cost trap. NOKIN provides a set of full‑process maintenance inspection lists verified through on‑site testing for engineering teams, municipal DOT maintenance personnel, and park property engineering managers for your reference. Strictly implementing standardized maintenance for traffic signs can effectively extend the average trouble‑free operation life (MTBF) of solar traffic sign panels and significantly reduce equipment replacement frequency and long‑term operation costs.
The photovoltaic panel is the core energy-gathering component of the solar traffic sign, and its cleanliness directly determines the stability of equipment power supply. Improper cleaning methods will directly damage the panel structure and functional coating, significantly shortening its service life.
It is strictly forbidden to use high-pressure water guns to directly rinse the panel. High-pressure water flow will impact the sealing rubber layer at the edge of the panel, causing the rubber to crack, water seepage into the box, and resulting in internal circuit short circuits.
At the same time, acid-base type and abrasive chemical cleaning agents are strictly prohibited. These reagents will damage the anti-reflective AR coating on the panel surface, causing a decrease in light transmittance and a decline in power generation efficiency. Over time, this will lead to panel yellowing and accelerated aging.
Photovoltaic panel cleaning should avoid the high-intensity sunlight and high-temperature period at noon. During noon, the surface temperature of the panel is extremely high. Washing with cold water at this time will cause the tempered glass to undergo intense thermal expansion and contraction, easily causing the panel to crack and damage.
The optimal operation time is before dawn or after sunset, when the environmental temperature is mild and there is no accumulated heat on the panel, completely avoiding the risk of thermal expansion and contraction damage.
In high-pollution areas such as cement plants, mining areas, and coastal salt fog, the panels are prone to accumulate dust, dust, salt deposits, and bird droppings, as well as debris.
For such scenarios, anti-bird glue strips should be installed to prevent birds from landing and polluting. At the same time, regular use of dust-free soft cloths combined with neutral water to wipe the panels can prevent stubborn dirt, salt crystal corrosion of the panel surface, and ensure stable power generation efficiency.
Many maintenance teams encounter a common problem: during the summer when the solar traffic sign is operating normally, it frequently experiences under-voltage and insufficient power supply faults in winter. The core reason is not equipment damage, but the change in the solar incidence angle with the seasons, which significantly reduces the effective sunlight duration.
During summer, the solar altitude angle is high, and the photovoltaic panel receives sufficient light; during winter, the solar tilt angle is low, and the original fixed-angle photovoltaic panel receives significantly less light, resulting in a sharp decline in charging efficiency and insufficient energy storage, causing the equipment to stop.
At the same time, trees grow rapidly in spring and autumn, easily blocking the photovoltaic panel. Maintenance personnel need to re-measure the shading radius of surrounding branches every quarter to promptly prune the blocking branches and remove the obstructions around the panel to ensure that the annual light conditions are met.
Batteries and BMS (Battery Management System) are the core components for the stable operation of solar traffic signs, providing energy storage. Battery aging, sulfation, and poor contact are the main causes for equipment to be prematurely scrapped. Regular on-site health status inspections are necessary.
By measuring the static open-circuit voltage (OCV) and the voltage drop of the simulated load, the degree of battery aging can be quickly determined. The specific determination criteria are as follows in the table:
|
Battery Condition |
Static Open-Circuit Voltage (OCV) |
Voltage Drop Under Simulated Load |
Operation and Maintenance Recommendations |
|
Healthy Condition |
Standard rated voltage ± 0.1 V |
≤ 0.2 V |
Perform routine maintenance; no replacement required. |
|
Slight Aging |
0.2–0.3 V below standard voltage |
0.2–0.5 V |
Enhance monitoring and perform regular recharging maintenance. |
|
Severe Aging / Failure |
More than 0.5 V below standard voltage |
≥ 0.6 V |
Replace the battery immediately to prevent sudden system shutdown. |
For equipment operating outdoors for a long time, the battery connection terminals are prone to oxidation, sulfation, and rusting, resulting in poor contact and abnormal charging and discharging.
During each inspection, the oxide layer and sulfation powder on the terminals should be cleaned, the waterproof and anti-corrosion grease should be evenly applied, the connection joints should be tightened, and false connections, leakage, and overheating problems should be eliminated.
Extreme temperature environments will seriously affect the charging and discharging efficiency of the battery and even cause safety hazards. Targeted temperature control protection needs to be done.
The commonly used lithium iron phosphate (LiFePO4) batteries have charging and discharging mechanisms restricted below 0°C. Forced charging at low temperatures will cause lithium to precipitate, easily resulting in internal short circuits, bulging damage, and other problems.
During winter inspections in northern high-latitude areas, it is necessary to focus on confirming that the controller has a low-temperature charging cut-off protection function. In low-temperature environments, charging should be automatically paused, only discharging function retained, to fundamentally avoid battery damage risks.
In hot and humid areas, the battery compartment space is prone to exceeding the temperature limit, causing battery heat attenuation and runaway problems, significantly shortening battery life.
Regularly check the integrity of the battery compartment insulation layer in summer, check whether the ventilation and heat dissipation structures are unobstructed, promptly clean the debris in the ventilation ports, to avoid long-term high-temperature accumulation of the battery, prevent heat runaway faults.
The LED light-emitting components and PC optical lenses directly determine the visibility and traffic guidance effect of the signboard, and are also the core inspection items for compliance audits. Outdoor long-term exposure to sunlight and rain erosion can lead to aging and failure of optical components.
During inspections, it is necessary to focus on checking the condition of polycarbonate (PC) optical lenses, promptly identifying problems such as yellowing, fogging, and surface micro-cracks caused by ultraviolet aging. These problems will reduce light transmittance, resulting in insufficient signboard brightness and non-compliance with visibility standards.
At the same time, regular testing of LED flashing mode is required, strictly matching the MUTCD standard to ensure the pulse frequency is stable at 50–60 FPM (times per minute). If there is flashing disorder or too low flashing frequency, it is mostly caused by driver aging, and timely maintenance and replacement are required to eliminate compliance risks.
High-quality solar traffic signs have "dual safety guarantees". In addition to the active LED lighting function, the reflective film on the sign is the last safety line in the extreme power-off situation.
Daily maintenance requires ensuring that the performance of the reflective film meets the ASTM D4956 Type IV / Type XI standard to guarantee that the signboard still has a clear visual effect in complete power-off and no-light source scenarios.
For asphalt splashes, dust, oxidation scratches attached to the surface of solar traffic signs, use dedicated compliance agents for cleaning. Do not use brute force wiping or corrosive reagents for cleaning to avoid damaging the reflective film structure and inverse reflection performance, ensuring long-term compliance and standardization.
Solar traffic signs along highways and main roads are often subjected to the impact of heavy truck airflow and wind loads for a long time, which can easily cause high-frequency resonance and lead to loosening of the fixed structure.
Quarterly inspections should focus on checking the fastening torque of U-shaped clamps and anti-loosening nuts on the upright columns, and identifying problems such as structural loosening, deviation, and deformation. Timely reinforce the loose components to prevent equipment tilting, detachment, and line pulling and breaking caused by long-term resonance.
The protection level of regular solar traffic signs can reach IP65/IP66, effectively preventing dust, water, and moisture. However, the sealing components will age and fail over time, so regular inspections and maintenance are necessary.
The focus should be on inspecting the sealing strips of the equipment casing, checking for signs of aging such as hardening, cracking, detachment, and poor sealing, and replacing any worn-out strips promptly to ensure the casing's airtightness.
At the same time, regular maintenance of the equipment's waterproof and breathable valves is required. Temperature changes can cause pressure differences and condensation inside the equipment compartment. The breathable valve can balance the internal and external pressure and remove internal moisture, preventing the controller motherboard from getting damp and short-circuiting, which is a key component in preventing internal circuit faults.
Based on the seasonal climate characteristics, formulate standardized quarterly maintenance plans for solar traffic signs, which can achieve precise prediction and early prevention of faults, ensuring the stable operation of the equipment throughout the year.
|
Maintenance Quarter |
Core Climate Characteristics |
Core Maintenance Items |
|
Spring (thaw inspection) |
Melting snow and ice, residual salt spray, and frequent animal activity |
1. Clean the residual deicing agent on the equipment surface and check for salt corrosion marks |
|
Summer (heat prevention and rain protection) |
High temperature exposure, frequent rainstorms, lightning weather |
1. Test the temperature rise of the battery to check for heat attenuation hazards |
|
Autumn (winter preparation) |
Leaves accumulate, decreasing sunlight duration, temperature drops |
1. Recheck and fine-tune the tilt angle of the photovoltaic panels to adapt to the winter sunlight angle |
|
Winter (snow and ice removal) |
Severe cold, ice and snow accumulation, weak sunlight |
1. Use rubber scrapers to gently remove snow and ice from the photovoltaic panels, prohibiting hard scraping |
To facilitate on-site maintenance personnel to quickly handle faults, summarize common fault phenomena, core causes, and on-site first-check actions to achieve rapid fault location and efficient resolution.
|
Fault Phenomenon |
Typical Core Cause |
First On-Site Check Action |
|
The LED continuously flashes during the day and cannot enter sleep mode. |
Dirt covering the light sensor; drift in the controller's light-control threshold. |
Clean dirt and dust from the light sensor surface. Check the controller's light-control input signal voltage and recalibrate the threshold parameters. |
|
The light turns on normally at dusk but automatically switches off after 2–3 hours. |
Severe battery capacity degradation; insufficient photovoltaic charging during the day. |
Measure the battery voltage difference between morning and evening to assess battery aging. Check whether photovoltaic charging efficiency meets the required standards. |
|
The system loses power and shuts down after two consecutive cloudy days. |
Reduced autonomous power supply duration; insufficient energy storage capacity. |
Check for localized shading of the photovoltaic panels and disconnected parallel battery connections. Measure battery capacity to assess aging and degradation. |
|
Some individual LED bulbs illuminate while others remain off. |
A current-limiting fault on the driver board; poor solder joints or faulty connections in the LED string. |
Measure the constant current in the LED string circuit. Identify faulty solder joints and assess whether the driver board or LED light board needs replacement. |
The long-term stable operation of solar traffic signs does not lie in the repair and remediation after failures, but in the regular and standardized preventive maintenance. Through cleaning and calibration of photovoltaic units, health management of battery storage, compliance inspection of optics, maintenance of IP protection of the structure, and regular quarterly operation, it is possible to completely avoid the risk of sudden shutdown, compliance penalties, and high emergency repair costs.
Standardized operation not only maximizes the service life of solar traffic signs, but also continuously ensures traffic safety and reduces long-term operation costs for municipal and engineering teams.
