Key maintenance tips for keeping solar street lights running efficiently

As global energy crises and environmental concerns become increasingly prominent, solar street lights have emerged as the mainstay of lighting for urban roads, rural communities and industrial estates, thanks to their energy-saving, eco-friendly nature and ease of installation. However, in practical operation, many areas have experienced issues such as reduced lighting duration, diminished brightness and even frequent malfunctions. To address this, we interviewed several senior engineers in the field of renewable energy lighting and have summarised a set of key maintenance techniques to ensure the efficient operation of solar street lights, thereby helping green lighting achieve maximum effectiveness.

I. Maintenance of Core Components: The Cornerstone of Light-to-Electricity Conversion

• Regular cleaning of photovoltaic panels: “Dust, bird droppings and leaves blocking the panels are the primary causes of reduced power generation efficiency,” explains engineer Li Ming. He recommends a thorough clean at least once every quarter. During seasons with high wind and sand or severe smog, the frequency of cleaning should be increased. When cleaning, use a soft cloth and clean water; avoid using hard objects to scrape the surface or corrosive solvents, as these may damage the anti-reflective coating.

• Check for physical damage: Panels should be inspected regularly for cracks, hot-spot effects or internal yellowing. Should any signs of ageing be detected, they should be replaced promptly to prevent the entire array from failing.

II. Energy Storage System Management: Focusing on the ‘Heart’ of the System

• Waterproofing and Heat Dissipation: It is crucial to check the seal of the battery compartment. Moisture is the battery’s arch-enemy; any ingress of water can lead to short circuits or accelerated self-discharge. Additionally, during the high temperatures of summer, the ventilation of the compartment must be checked to prevent the batteries from overheating and swelling.

• Special winter protection: In cold northern regions, low winter temperatures can significantly reduce battery activity. Maintenance personnel should test battery capacity before winter sets in and, where necessary, apply insulation or replace the batteries with ones specifically designed for low temperatures.

III. Smart Control and Circuit Inspection: Details Determine Success or Failure

• Controller Settings: The controller acts as the ‘brain’ of the streetlight. Regular checks must be carried out to ensure that light-sensing and time-control functions are operating correctly. Lighting times and power modes should be adjusted promptly in line with seasonal changes (such as the summer and winter solstices) to achieve a balance between energy efficiency and adequate illumination.

• Tightening and Rust Prevention: Due to prolonged exposure to the elements, the fastening bolts on street lamp poles are prone to loosening due to vibration, and terminal connections may become oxidised and loose. It is recommended to carry out a tightening inspection every six months and to remove rust and repaint metal components to prevent flickering or failure caused by poor contact.

IV. Establishing Digital Records

For large-scale street lighting projects, experts recommend implementing a smart street lighting management system. By utilising IoT technology to remotely monitor the battery voltage, charging current and operational status of each lamp, a shift from ‘reactive repairs’ to ‘proactive alerts’ can be achieved, significantly reducing operational and maintenance costs.

The tendency to “prioritise construction over maintenance” is a key issue leading to the premature decommissioning of many solar streetlights. It is widely acknowledged within the industry that for a high-quality solar streetlight system, 30% depends on quality and 70% on maintenance. Through scientific, periodic maintenance, not only can the service life of streetlights be extended by 3–5 years, but the safety of night-time travel can also be ensured, thereby truly realising the social benefits of energy conservation and emissions reduction.