According to industry observations, the root cause of the substandard performance of a large number of solar street lights is not the equipment itself, but avoidable installation errors. Solar street lights are supposed to be both environmentally friendly and economical long-term investments, relying on clean energy to supply power to lower electricity bills and longer service life, but once caught in the installation mistakes, these advantages will be canceled out one by one, such as early battery obsolescence, panel power generation efficiency plummeting, and even the safety hazards of tipping over the light pole. In this article, we will dismantle the 7 core misconceptions in solar street light installation, and provide the avoidance solutions that can be implemented to help the installation team and project managers to ensure the long-term stable operation of the system and maximize the return on investment.
install solar street lights
Many projects only consider the road lighting needs when selecting the site, ignoring the “light just need” of solar panels. Many projects only consider the road lighting needs when selecting the location, ignoring the “immediate need for light” of the solar panels, often installing the street light in the shadow area of high-rise buildings, under the shade of dense trees, or close to fences, billboards, and other obstructions, resulting in the panels not being able to receive sufficient sunlight during the day, which will directly affect the charging efficiency. For example, a neighborhood in the landscape trees installed next to the solar street light, the initial seemingly unobstructed, with the growth of trees, the subsequent panel light time is greatly reduced, and in winter there is even a lack of light time at night.
The core hazards include: a significant decline in solar panel charging efficiency; the battery is in a long-term “undercharged” state, the life is greatly shortened; nighttime lighting hours are unstable, and frequently appear “out in the middle of the day” problem.
The power generation efficiency of solar panels is directly related to the orientation and tilt angle, but in actual installations, many teams make two mistakes: one is to uniformly adopt the “default tilt angle” without considering the latitudinal differences of the installation site; The second is to confuse “magnetic south” and “true south”, resulting in the panel facing away from the optimal angle. More easily overlooked is the effect of seasonal changes, the sun’s altitude angle in summer and winter differences are obvious, if the tilt angle is fixed, there will be “summer energy saving, winter power shortage” imbalance.
Some installation teams, in order to save costs or shorten the construction period, “cut corners” in the fixing of light poles and the construction of foundations by using substandard concrete foundations, reducing the number of ground bolts, or omitting soil bearing capacity tests. Directly according to the “experience depth” excavation. Such operations make street lights “unbearable” in inclement weather. Common structural problems and risks are shown in the table below:
| Structural Issue | Specific Manifestation | Potential Risk |
| Insufficient Foundation Depth | Concrete foundation depth not meeting regional standards (too shallow in low-latitude or permafrost areas) | Pole collapse in typhoons or heavy rain |
| Inferior Materials | Use of regular steel instead of galvanized steel, insufficient bracket thickness | Corrosion or breakage of components |
| No Soil Testing | Ignoring soil type differences, using a uniform foundation design | Foundation settlement, pole tilting |
Wiring is easily overlooked, and common mistakes include unsealed connectors, mismatched wire diameters and currents, reversed wiring, or exposed wires. These problems not only affect the efficiency, but also may lead to safety accidents, such as a factory street lights due to the joints are not waterproof, rainwater infiltration caused by short-circuit burned batteries, and even line smoke. Wiring needs to follow the “Seal, Match, Mark” standard: joints are sealed and waterproof, wire diameter is selected according to current, wires are labeled, and wires are tested with a multi meter to ensure that there are no problems.
Quite a lot of projectors think that solar street lights do not need maintenance, and do not care about them after installation, without cleaning and testing or spare parts. Long-term this will lead to panel dust accumulation, light transmission rate drop, battery terminal oxidation, LED bead attenuation, power generation efficiency is greatly reduced, and ultimately batch replacement of batteries additional cost. A “monthly – quarterly – annual” maintenance system can be set up with an intelligent system for remote monitoring and timely detection of anomalies.
Climate differences in different regions have different requirements for solar street light “tolerance”, but some projects do not take into account the environmental specificities when selecting and installing: high temperature areas use ordinary lithium batteries, However, some projects did not consider the environmental specificities when selecting and installing: ordinary lithium batteries are used in high temperature areas, non-anti-corrosive poles are used in coastal areas, and line insulation is not done in high temperature areas. The ordinary lithium batteries used in a project in a high-temperature area have a greatly shortened life span due to long-term exposure to high temperatures; the lines in a high-cold area without thermal insulation freeze at low temperatures, resulting in the street lights not being able to light up for many days in a row.
solar street lights
With the development of IoT technology, smart control has become the “standard” for solar street lights, but there are still projects that install only “basic lighting functions” to control costs “, without integrating human body sensing, remote monitoring, dimming and other functions. This “minimalist configuration” leads to two major problems: First, energy waste, street lights all day light or fixed brightness, can not be adjusted according to the flow of people, traffic. The second is inefficient operation and maintenance, as equipment failures need to be investigated manually on-site and cannot be remotely located.
Solar street light installation gives priority to open areas, such as the central isolation zone of the road, the edge of the green belt and other unobstructed locations, while avoiding the planned At the same time, avoid the planned building land, fast-growing trees and other areas that may be shaded in the future. Regular review after installation and quarterly on-site inspections will be carried out, and if any tree growth or new building shading is found, the branches will be trimmed or the angle of the panels will be fine-tuned in time when conditions permit.
Based on the geographic characteristics of the installation site, the orientation should be accurately aligned with the geographic due south rather than magnetic south, which can be calibrated by cell phone GPS or professional compass to control the deviation in a very small range. The tilt angle should be set to match the latitude of the installation site, and at the same time take into account the seasonal differences, reduce the tilt angle appropriately in summer, and increase the tilt angle appropriately in winter, so as to balance the power generation efficiency in different seasons. For projects requiring high power supply stability, single-axis or dual-axis solar trackers can be installed to allow the panels to follow the sun in real time, further enhancing power generation efficiency.
Structural construction strictly follows the process of “Test – Selection – Acceptance”. Firstly, the soil test is carried out by a professional organization to detect the type of soil at the installation point, and accordingly determine the suitable foundation depth, which is different for different soil areas. The choice of materials must meet the standard, the light pole selection of high-quality galvanized steel, bracket stainless steel in line with the level of rust resistance, foot bolt selection of high-strength type and ensure that the number is sufficient. Enhanced treatment for special areas, anti-corrosion treatment of light poles in coastal areas, and increase the wind rod in high wind areas to ensure that the wind resistance of light poles meets the requirements.
To address the hidden dangers of wiring, we start from the operational details and quality control. When selecting wires in the early stage, according to the overall power and transmission distance of the system, copper-core wires with appropriate wire diameter are selected to avoid overloading of current due to too small wire diameter. During the wiring process, all joints are tightly wrapped with heat-shrinkable tubing, the outer layer is then wrapped with waterproof tape, and UV-resistant PE tubing is used for threading, and the ends of the tubing are sealed with sealant to prevent rain and moisture from seeping in.
solar street lights
After the wiring is completed, a multi meter is used to test the line through and voltage, and at the same time, the insulation of the line is checked to eliminate the risk of leakage. Later operation and maintenance regularly check whether the outer layer of the line is damaged or aged, and replace it in time to avoid short-circuit caused by wear and tear of the line.
The maintenance program covers the whole process of “Daily Cleaning – Periodic Inspection – Parts Replacement”. Daily cleaning is carried out once a month, using a soft-bristle brush with neutral detergent to wipe the panel, removing dust, bird droppings and other debris to prevent the light transmission rate from decreasing.
Regular testing is conducted quarterly, focusing on checking battery voltage, terminal oxidation and LED lamp bead brightness attenuation, terminal oxidation with sandpaper, lamp bead attenuation exceeding the standard timely replacement. Annual maintenance for a comprehensive overhaul, replacement of wear parts, according to the seasonal adjustment of the panel tilt, testing the grounding system lightning performance. With the help of intelligent monitoring platform to monitor the equipment data in real time, abnormal automatic alarm, reduce the blind spot of manual inspection.
According to the climatic characteristics of the installation site, carry out targeted selection and transformation. High-temperature areas choose high-temperature lithium batteries, install heat sinks on the back of the panel, and open ventilation holes on the top of the pole to reduce the internal temperature. Low-temperature lithium batteries are used in high-temperature areas, with heat-insulating cotton on the line jacket and antifreeze added to the foundation concrete to prevent freezing and cracking in winter.
In coastal areas, salt spray corrosion-resistant materials are used for light poles, all metal parts are passivated, and anti corrosive coatings are sprayed regularly to resist salt spray erosion. In dusty areas, dust covers are installed on the outside of the panels to shorten the cleaning cycle and ensure that light absorption is not affected.
Integrate Intelligent Control Systems prioritizes the configuration of core functions in accordance with the actual needs of the project. The basic layer includes light control and human body sensing functions, realizing the energy-saving modes of automatically lighting up when it is dark, fully lighting up when there are people in the car, and lowering the lighting when there is no one in the car, thus reducing unnecessary energy consumption. Practice shows that after the integration of intelligent control, the energy consumption and operation and maintenance workload of the street light are significantly reduced, and the efficiency of fault handling is greatly improved.
Rural roads are mostly distributed along farmland and woodland, and the installation needs to focus on avoiding the problem of tree obstruction, and prioritize the area without tall trees along the road; if it is impossible to avoid, the tree branches need to be trimmed in advance and the tree growth space needs to be reserved, so as to prevent the panel from being obstructed in the later stage. At the same time, the rural roads at night less pedestrians, vehicles, can be appropriate to reduce the height of the street light installation (recommended 5-6 meters), with the human body sensor function, to reduce the waste of energy; foundation construction need to consider the countryside soil mostly clay or sandy soil, clay areas need to deepen the depth of the foundation and do a good job of water drainage, sandy areas can be around the foundation of the padded gravel, to enhance the stability of the foundation.
solar street lights
Vehicle traffic is frequent in industrial parks, and heavy vehicles may pass through some areas. The foundation of street lights should be designed according to higher standards, and the foundation depth is recommended to increase by 20%-30% compared with the common scene. Thickened galvanized steel is used for the light poles to prevent damage caused by collision with vehicles. In addition, there may be dust and oil pollution in the industrial park, the cleaning cycle of the panel should be shortened to once every 2 weeks to avoid dust and oil adhesion affecting the light transmittance; if there are corrosive gases in the park (e.g., in the chemical park), the light poles and brackets need to be made of corrosion-resistant materials, and the terminals should be made of waterproof and anti corrosive fittings to prolong the service life of the equipment.
Scenic installation of solar street lights need to take into account the functionality and aesthetics, pole style is recommended to match the overall style of the scenic area (such as antique, landscape), to avoid destroying the scenic landscape coordination. At the same time, the scenic area is located in the mountainous area or dense vegetation area, need to avoid ecologically sensitive areas (such as ancient trees, wildlife habitat), the installation process to reduce the damage to the surrounding vegetation; part of the scenic area at night need to maintain a lower brightness to protect the ecological environment, can be set through the intelligent control system at night to reduce the brightness of the mode, not only to meet the basic lighting needs, but also to avoid the impact of glare on the work and rest of plants and animals.
The installation quality of solar street light directly determines its long-term value, avoiding the above seven major misunderstandings, combined with the scene characteristics of good site selection, orientation, reinforcement, operation and maintenance and other key aspects, not only to ensure the stable operation of the equipment to extend the service life, but also to make this clean energy program to truly play a dual benefit of environmental protection and economy, for different scenes of the lighting needs to provide a long-lasting and reliable support.
