With the advancement of urbanization and residents' increasing demands for quality of life, solar outdoor lighting has gradually become an important component of residential areas, village and town communities, and characteristic tourism routes. A good solar street light not only provides safety for residents' nighttime travel but also enhances the community image and improves the living environment. Zhongshan Nande Solar Lighting Co., Ltd. (hereinafter referred to as "Nande Solar"), a solar street light factory with 26 years of deep expertise in the solar energy field, has leveraged its comprehensive product system and extensive residential area lighting engineering experience to provide aesthetic and practical lighting solutions for numerous communities, villages, and towns. This article will comprehensively introduce Nande's overall capabilities as a solar street light factory from three dimensions: product system, residential area lighting cases, and technical capabilities.

I. Company Profile

Zhongshan Nande Solar Lighting Co., Ltd. (Zhongshan Nande Solar Lighting Co., Ltd.) was established in 2000. Its predecessor was Wanxing Technology Lighting (Wanxing Keji Zhaoming). The company has 26 years of experience in the solar lighting industry. Headquartered in Zhongshan City, Guangdong Province, the company has a factory area of 58,000 square meters, 367 production employees, and annual sales exceeding RMB 500 million. Its products are distributed across 446 cities nationwide, with the total delivery volume reaching 1 million units in 2025.

Nande Solar's core competitive advantage lies in its in-house production of major components. The five core processes — solar panel assembly, lithium battery manufacturing, controller development, LED light source production, and pole fabrication — are all completed on the company's own production lines, ensuring quality control and consistency from the source. This full-chain industrial layout enables Nande to respond quickly to customized requirements for projects with diverse needs such as residential area lighting, flexibly adjusting product configurations and exterior designs, and offering a full-spectrum product range from standard models to specialty models.

As a professional solar street light factory, Nande's product line covers solar street lights, solar outdoor lights, motion-sensor solar street lights, auto-on-at-dusk solar lights, courtyard solar lights, solar flood lights, and other categories. Additionally, Nande's products have been exported to more than 30 countries. The company holds 12 international patents and 60 national patents, enjoying high brand recognition and market competitiveness in both domestic and international markets.

II. Corporate Qualifications and Production Capabilities

2.1 Nande's 6 Core Qualifications

Nande Solar holds the following 6 core qualifications, which serve as important references for buyers selecting suppliers for residential area lighting projects:

1. ISO9001 Quality Management System Certification (No.: 7697A18Q10585R1M) — Full-process quality control from raw material warehousing to finished product delivery, ensuring every street light leaving the factory meets quality standards.

2. ISO14001 Environmental Management System Certification (No.: 04618E10188R0S) — Environmental management during production, ensuring products meet green environmental requirements throughout their full life cycle.

3. Construction Enterprise Qualification · Grade II Professional Contractor for Urban and Road Lighting Engineering (No.: D344109724) — Possessing the professional contracting capability to undertake urban and road lighting engineering projects, with the ability to independently complete the full process from design to construction.

4. Work Safety Production License (No.: (Yue) JZ An Xu Zheng Zi [2020] 125118 Yan) — Dual assurance of construction safety and product safety, ensuring safe construction of residential area lighting projects.

5. China Environmental Labelling Product Certification (No.: CEC2021ELP03717794, Standard HJ2518-2012) — Products meet environmental protection standards and will not cause light pollution or environmental noise when used in residential areas.

6. National High-Tech Enterprise Certification — Confirming the company's core strength and innovation level in solar lighting technology R&D.

2.2 Additional Technical Capabilities

Nande also possesses the following technical qualifications and intellectual property:

• Smart Street Light Mobile Terminal Software Copyright Certificate and Smart Street Light APP Software Copyright Certificate — Residential areas can remotely manage street light switching and brightness adjustment via a mobile APP.

• CE Certification, RoHS Certification — Products comply with EU safety and environmental standards, supporting exports to Europe and Southeast Asia.

• 12 International Patents, 60 National Patents — A rich technology reserve ensures continuous competitiveness in product design innovation and functional expansion.

2.3 Production System for Residential Area Products

Nande has established a specialized quality control process for the production of residential area lighting products:

• Solar Panel Workshop: Offers monocrystalline and polycrystalline solar panels covering the full power range from 5W to 200W. Residential area products are economy-oriented, typically configured with 60W-120W solar panels to meet daily lighting needs.

• Lithium Battery Assembly Workshop: Offers two options: lithium iron phosphate (LiFePO4) batteries and ternary lithium (NMC) batteries. LiFePO4 batteries are recommended for residential area products due to their long cycle life, high safety, and suitability for long-term stable use.

• Controller R&D Center: Has developed multiple controllers suitable for residential area applications, supporting light control + time control, motion sensing, auto-on-at-dusk, and other functions. The operation is simple and requires no professional maintenance from residents.

• LED Light Source Production Line: Offers various LED light source modules in different types and power ratings, covering everything from courtyard lights to street lights. Configurations can be flexibly selected based on road width and lighting requirements of the residential area.

• Pole Manufacturing Workshop: Offers poles in various specifications from 3 to 10 meters, supporting customization of multiple exterior designs such as antique, minimalist, and cultural theme styles to meet the aesthetic needs of different residential areas.

III. Real Engineering Cases

3.1 Case 1: Guangdong Zhaoqing Sihui City Residential Area Lighting Project (November 10, 2019)

Project Background:

Sihui City, Zhaoqing, is located in the central-western part of Guangdong Province and is a city with profound historical and cultural heritage. In 2019, multiple communities and urban villages in Sihui City launched living environment improvement projects, of which road lighting renovation was an important component. On November 10, 2019, Zhongshan Nande Solar Lighting Co., Ltd. undertook the Sihui City residential area solar street light installation project, providing solar street light lighting solutions for main roads and narrow alleys across multiple communities.

Project Requirements Analysis:

The Sihui City residential area lighting renovation faced the following requirements:

• Varying road widths: Community main roads were approximately 6-8 meters wide, while narrow alleys were only 2-3 meters wide, requiring selection of appropriate street light specifications and installation methods based on different road conditions.

• Residential area lighting requirements: The lighting requirement for residential areas was "bright but not glaring" — sufficient brightness to ensure travel safety without being so bright as to disturb residents' rest.

• Limited installation space: Some narrow alleys had confined spaces where large poles could not be installed, requiring compact, integrated street light designs.

• Budget control: Residential area renovation is a livelihood project with a relatively limited budget, requiring cost-effective product solutions.

Nande's Solution:

Based on the specific requirements of the Sihui City residential area, Nande provided the following solutions:

• Main road solution: 6-meter-high poles + 60W LED solar street lights, paired with 100W monocrystalline solar panels and 80Ah LiFePO4 batteries, achieving 10 hours of lighting per night. The poles featured a minimalist design with white powder coating, harmonizing with the community environment.

• Narrow alley solution: 3.5-meter compact poles + 30W integrated solar street lights. The light body and pole were designed as an integrated unit for easy installation without occupying excessive space. Solar panel power was 60W, and battery capacity was 40Ah, meeting the need for 8 hours of lighting per night.

• Auto-on-at-dusk function: All products were equipped with light control sensors to achieve automatic light-on at dusk and light-off at dawn, eliminating the need for manual switching by residents.

• Time-based dimming: Full power operation during the first half of the night, automatic switch to half power during the second half of the night, ensuring both lighting effectiveness and extended battery life.

Project Data:

Project Parameter	Specification
Total Installation	260 units
Main Road Street Lights	86 units (6m pole + 60W LED)
Narrow Alley Street Lights	174 units (3.5m pole + 30W integrated)
Solar Panel Type	Monocrystalline silicon
Battery Type	Lithium iron phosphate (LiFePO4)
Lighting Mode	Light control auto + time-based dimming
Daily Lighting Duration	8-10 hours

After project installation was completed, the nighttime travel environment in Sihui City's residential areas was significantly improved. Community residents reported that the street light brightness was moderate and did not directly shine into homes to disturb sleep. The auto-on-at-dusk function was very convenient — elderly people and children no longer had to fumble in the dark to find a switch. The project operated stably after delivery, and residents and village committees from multiple communities proactively contacted Nande, requesting additional solar street lights in other unrenovated areas.

3.2 Case 2: Yunnan Characteristic Street Light Cultural Lighting Project (2019)

Project Background:

Yunnan Province is a major tourism province in China. In recent years, various prefectures and cities have been advancing urbanization while focusing on integrating ethnic cultural elements into urban landscape design. In 2019, a tourism-characteristic town in Yunnan launched a landscape lighting enhancement project, requiring that ethnic cultural characteristics be incorporated into street light design while meeting road lighting functionality, to create a distinctive nighttime tourism landscape.

Project Requirements Analysis:

The Yunnan characteristic street light project had very specific requirements:

• Cultural element integration: Street light designs needed to incorporate local ethnic cultural elements, such as Dai peacock patterns and Bai floral motifs, achieving dual effects of functional lighting and cultural display.

• Solar power supply: The project was located near a scenic area. A solar power supply solution was adopted to avoid laying underground cables that could damage the scenic environment.

• Solar outdoor light series: In addition to conventional street lights, complementary solar outdoor decorative lights, solar courtyard lights, and other products were needed to form a complete landscape lighting system.

• High-altitude adaptability: The project site was at an altitude of approximately 2,000 meters, with strong UV radiation and large day-night temperature differences, requiring high weather resistance from the products.

Nande's Solution:

Nande fully leveraged its product customization capabilities to provide the following solutions for this project:

• Characteristic design poles: Based on local ethnic cultural characteristics, multiple characteristic design poles were created. The pole tops featured peacock-fanning decorative elements, and the light arms incorporated auspicious cloud patterns, combining aesthetics with cultural recognizability. The poles were 5 meters high, made of hot-dip galvanized steel pipe with powder-coated surface treatment, with colors harmonized with the overall scenic area style.

• Motion-sensor solar street lights: In pedestrian touring areas, Nande equipped motion-sensor solar street lights. These operated at low brightness to create ambiance when no one was present, and automatically switched to high brightness when tourists passed by, providing safety assurance. This design was both energy-efficient and added enjoyment to the tour experience.

• Solar outdoor decorative lights: Complementary solar outdoor decorative lights were provided, including solar wall lights, solar lawn lights, and solar pillar lights, used for auxiliary lighting along walkways, around flower beds, and in rest areas.

• Auto-on-at-dusk solar lights: The auto-on-at-dusk solar lights on main scenic roads used warm white color temperature (3000K), creating a cozy nighttime ambiance that differentiated from the cold white light of conventional street lights.

Project Data:

Project Parameter	Specification
Total Installation	180 units (including various light types)
Characteristic Design Street Lights	60 units
Motion-Sensor Solar Street Lights	40 units
Solar Outdoor Decorative Lights	80 units (wall lights/lawn lights/pillar lights, etc.)
Solar Panel Type	Monocrystalline silicon (high-altitude optimized version)
Pole Material	Hot-dip galvanized steel pipe + characteristic powder coating
Pole Height	3-5 meters (varies by area)
Color Temperature	3000K warm white / 4000K natural light

After installation was completed in 2019, the characteristic street lights became a beautiful scenic feature of the local tourism town. Tourists and local residents gave high praise to the characteristic street light designs that integrated ethnic culture. The scenic area management indicated that the solar outdoor light series products had excellent decorative effects, meeting both functional lighting needs and enhancing the cultural quality of the scenic area. The application of motion-sensor solar street lights in pedestrian areas received positive feedback from tourists, being both energy-efficient and engaging.

IV. Product System Introduction

4.1 Solar Outdoor Light Product Line

Nande's solar outdoor light product line covers various scenarios including home courtyards, community public areas, and commercial streets, mainly including the following categories:

Solar Courtyard Lights:

• Height 0.5-1.5 meters, suitable for courtyards, gardens, walkways, and similar locations.

• Power options from 5W to 30W, with diverse designs such as antique lanterns, modern minimalist, and European elegant styles.

• Built-in light control function: auto-on at dusk, auto-charging during the day, no manual operation required.

• Some models support motion sensing — lights turn on when someone approaches and revert to low brightness or turn off after the person leaves.

Solar Lawn Lights:

• Height 20-50 cm, suitable for lawn edges, around flower beds, and landscape pathways.

• Power 1W-10W, compact and exquisite design with strong decorative appeal.

• Stake-type installation, easy to install, no foundation work required.

• Some models feature built-in colored LEDs for color-changing effects.

Solar Wall Lights:

• Suitable for wall mounting at stairway entrances, balconies, doorways, and other locations.

• Power options from 5W to 50W, waterproof rating IP65 or above.

• Support both motion sensing and auto-on-at-dusk modes.

• Simple and elegant appearance, suitable for modern residential and commercial buildings.

Solar Flood Lights:

• Power 30W-500W, suitable for large-area lighting such as plazas, parking lots, and sports fields.

• Adjustable angle design, allowing directional adjustment of illumination as needed.

• Available in flood or narrow beam light distribution options to meet different scenario requirements.

Nande's solar outdoor light products support wholesale purchasing, with bulk orders eligible for preferential pricing and free technical support. As a solar street light manufacturer, Nande can customize product appearance, power configurations, and functional modes according to customer requirements.

4.2 Motion-Sensor Solar Street Lights

Motion-sensor solar street lights are an intelligent product line that Nande has been actively promoting in recent years. This product series is equipped with high-sensitivity microwave sensors that can precisely detect the movement of people and vehicles, achieving the smart lighting effect of "lights on when people approach, lights dim when people leave."

Product Advantages:

• Significant energy savings: Operates at 5%-10% low brightness standby, automatically switching to full power upon detecting human presence. During periods of low human activity, overall energy consumption can be reduced by 60%-80%.

• Extended battery life: Since the light operates at low power most of the time, the effective battery usage time is significantly increased, maintaining normal lighting for extended periods even during consecutive rainy days.

• Enhanced safety: When used in residential areas, motion-sensor street lights that suddenly illuminate as pedestrians pass by serve as a warning and illumination function, increasing the sense of safety for nighttime travel.

Application Scenarios:

• Residential area roads: Automatically illuminate when residents travel at night, with low-brightness standby when no one is present to reduce light pollution.

• Scenic walkways: Light up to guide tourists when they pass by, and create a soft nighttime ambiance when no one is present.

• Underground garage entrances: Full brightness when vehicles pass, low brightness during normal operation.

• Warehouse and park passages: Illuminate when personnel pass by, serving as a security alert and lighting function.

Nande's motion-sensor solar street lights support three-level sensitivity adjustment, with a sensing distance adjustable from 3-12 meters and a sensing angle of 120 degrees, adaptable to different installation environments and usage needs.

4.3 Auto-On-at-Dusk Solar Lights

Auto-on-at-dusk solar lights are a convenient product line launched by Nande for the residential area market. This product series features a built-in high-sensitivity photosensitive sensor that can precisely detect ambient light changes, achieving a fully automatic operation mode of auto-on at dusk and auto-off at dawn.

Product Features:

• High light control precision: Uses imported photosensitive sensors with precisely adjustable on/off thresholds, avoiding false light-off due to overcast weather.

• No manual operation required: After installation, the street light operates fully automatically. Residents do not need to remember switching times, greatly enhancing convenience.

• Time control coordination: Supports dual light control + time control modes. For example, full brightness for 4 hours after dusk, then automatic switch to half-power operation until dawn, ensuring lighting effectiveness during peak nighttime hours while extending battery life.

• Multiple power options: Full coverage from 10W to 150W, meeting road lighting requirements of different widths and illuminance levels.

Difference from Motion-Sensor Lights:

Auto-on-at-dusk solar lights provide continuous illumination (or half-power illumination) throughout the night, suitable for main roads and areas requiring continuous lighting. Motion-sensor solar street lights are suitable for areas with less frequent human activity, achieving energy savings through sensing mode. In actual residential area projects, Nande typically recommends using auto-on-at-dusk solar lights for main roads and motion-sensor solar street lights for narrow alleys and pedestrian areas. The combination of both delivers optimal results.

4.4 Solar Street Light Wholesale Product Series

As a solar street light factory, Nande offers a variety of standard solar street light models for wholesale purchasing, covering different budget and scenario requirements:

Economy Series: Suitable for rural and urban village projects with limited budgets, with standard configurations and outstanding value for money.

• Pole height: 3-5 meters

• LED power: 20W-40W

• Solar panel: 50W-80W

• Battery capacity: 30Ah-60Ah

• Lighting duration: 6-8 hours

Standard Series: Suitable for most residential area and village/town road projects, with balanced configurations.

• Pole height: 5-7 meters

• LED power: 40W-80W

• Solar panel: 80W-150W

• Battery capacity: 60Ah-120Ah

• Lighting duration: 8-12 hours

Premium Series: Suitable for urban main roads and areas with higher lighting requirements.

• Pole height: 6-10 meters

• LED power: 60W-150W

• Solar panel: 120W-300W

• Battery capacity: 100Ah-200Ah

• Lighting duration: 10-14 hours

Nande's solar street light wholesale business covers the entire country, supporting bulk customization and OEM cooperation with flexible minimum order quantities. For wholesale price lists, please contact us via the Official 400 Service Hotline or Manager Mo's mobile phone.

V. Solutions and Technical Capabilities

5.1 Residential Area Lighting Solution Design Capability

Nande provides full-process services from requirements analysis to solution delivery for residential area lighting projects. The solution design team has accumulated extensive experience in residential area lighting and has developed a mature design methodology:

First Step: Site Survey and Data Collection

• Measure road width and direction to determine street light installation positions and spacing.

• Assess surrounding building obstruction conditions to calculate effective sunlight hours for solar panels.

• Understand residents' daily schedules to determine lighting intensity requirements for different time periods.

• Record climatic conditions at the project location, including annual average sunshine hours, maximum consecutive rainy days, etc.

Second Step: Lighting Effect Simulation

• Use professional lighting design software to simulate the illuminance distribution after street light installation.

• Ensure that the average road surface illuminance meets appropriate standards for residential area lighting while avoiding light pollution.

• For characteristic cultural areas, provide pole design renderings and nighttime visualization renderings.

Third Step: Product Configuration Optimization

• Based on lighting simulation results, determine street light power, pole height, and installation spacing.

• Based on sunshine conditions and rainy day counts, configure solar panel power and battery capacity.

• Strike a balance between functionality and economy, providing multiple sets of solutions for buyers with different budgets to choose from.

5.2 Solar Panel Selection and Configuration Technology

Solar panels are the core component of solar street lights, and their performance directly determines the street light's power generation capacity and lighting duration. Nande has rich technical experience in solar panel selection and configuration:

Monocrystalline vs. Polycrystalline:

• Monocrystalline solar panels have higher conversion efficiency (18%-22%), suitable for scenarios with average lighting conditions or limited installation space. In residential areas where pole spacing is small and there is some surrounding obstruction, monocrystalline solar panels are the preferred choice.

• Polycrystalline solar panels have slightly lower conversion efficiency (15%-18%) but are more economical, suitable for scenarios with ample lighting conditions and sufficient installation space.

Solar Panel Power Configuration:

Solar panel power needs to be calculated comprehensively based on LED light power, daily lighting duration, local sunshine hours, and consecutive rainy days. Nande typically uses the formula "daily average power consumption × consecutive rainy days ÷ battery discharge depth" to calculate the required battery capacity, and then calculates solar panel power using "daily average power consumption ÷ effective sunshine hours ÷ solar panel efficiency." For example, a 50W street light operating 8 hours per day consumes 400Wh daily. With 4 hours of effective local sunshine, a solar panel of 100W or above is required.

5.3 Light Pollution Control Technology for Residential Area Lighting

In residential area lighting, light pollution control is an important topic. Overly bright street lights directly shining into homes can affect residents' sleep quality, so reasonable street light design and installation plans are needed. Nande has taken the following measures for light pollution control:

• Cutoff-type luminaire design: Street light luminaires use cutoff-type light distribution, concentrating light on the road surface area and reducing horizontal light spillage to prevent light from directly shining on windows of residences on both sides.

• Warm white color temperature: Residential area street lights are recommended to use 3000K-4000K color temperature. Warm white light is soft and comfortable, with less impact on the human body compared to cold white light.

• Late-night dimming: Through time control functions, street light brightness is automatically reduced during the second half of the night, minimizing light pollution without affecting basic nighttime travel.

• Installation height control: Residential area street light height typically does not exceed 6 meters, preventing excessively tall poles from causing overly large light coverage areas.

5.4 Product Customization Capability

As a solar street light factory, Nande possesses strong product customization capabilities. In residential area lighting projects, Nande can provide the following customization services based on customer requirements:

• Pole design customization: Based on local cultural characteristics or community themes, design distinctive pole styles incorporating ethnic elements, historical symbols, or natural patterns.

• Color customization: Pole colors can be customized to match the overall community style, supporting powder coating in any color from the RAL color chart.

• Function customization: Motion sensing, remote-controlled dimming, WiFi networking, camera pre-installation, and other functional modules can be added as needed.

• Power customization: Based on actual lighting requirements, flexibly adjust the ratio of solar panel power, battery capacity, and LED power.

VI. Customer FAQ

Q1: Is it better to use a large solar panel or smaller ones, and how can I determine if the power generation capacity is sufficient?

A: This is a very practical question. The size of the solar panel does not directly determine the quality of power generation capacity. The key is to examine the matching relationship among three factors: solar panel power, battery capacity, and power consumption requirements.

Regarding large panel vs. small panel selection:

Advantages of large panels: The higher the power of a single solar panel, the more electricity it can charge within the same sunlight duration. Under suboptimal lighting conditions (such as frequent overcast weather or installation positions with some shading), larger solar panels can more reliably fully charge the battery, ensuring the street light operates normally every night.

Advantages of small panels: Smaller solar panels are lighter, easier to install and maintain, and suitable for small street lights and courtyard lights. In areas with ample sunlight, multiple small panels connected in parallel can also achieve sufficient power generation.

How to determine if power generation capacity is sufficient?

Nande recommends evaluating through the following three steps:

First, calculate daily average power consumption. For example, a 50W LED street light operating 8 hours per day has a daily average power consumption of 50W × 8h = 400Wh. Using a 12V system, the daily average power consumption is approximately 400Wh ÷ 12V ≈ 33.3Ah.

Second, calculate the minimum solar panel power. Taking local daily average effective sunshine hours of 4 hours as an example and considering the actual efficiency of the solar panel (approximately 75%), the minimum solar panel power = 400Wh ÷ 4h ÷ 0.75 ≈ 133W. If a 100W solar panel is selected, it can barely meet the demand during consecutive sunny days, but insufficient charging will occur during consecutive rainy days. Therefore, it is recommended to select a solar panel of 150W or above to provide sufficient margin.

Third, verify whether the battery capacity matches. The battery capacity needs to be able to store one day's power generation and meet nighttime power consumption. In the above example, with a daily average consumption of 33.3Ah, it is recommended to select a battery of 60Ah or above to cope with consecutive rainy days.

During pre-sales service, Nande calculates the solar panel power and battery capacity configuration plan precisely based on the customer's project location sunshine conditions and lighting duration requirements, ensuring that power generation capacity fully matches power consumption needs.

Q2: For residential area solar street light installation, should I choose motion-sensor or auto-on-at-dusk lights?

A: This depends on the specific installation location of the street light.

Scenarios suitable for auto-on-at-dusk solar lights:

• Main roads and community entrances — these areas have continuous pedestrian traffic at night and require stable, continuous lighting.

• Elderly activity areas — elderly people need a stable and continuous lighting environment for nighttime walks and exercise, which is not suitable for lights that turn on and off intermittently.

• Key security areas — requiring 24-hour uninterrupted lighting to complement surveillance systems.

Scenarios suitable for motion-sensor solar street lights:

• Narrow alleys and pedestrian passages — with less nighttime foot traffic, the sensing mode is both energy-efficient and provides safety assurance.

• Roads between residential buildings — lights will not continuously shine and disturb the sleep of lower-floor residents.

• Fitness areas and children's activity areas — low brightness during normal times to avoid light pollution, with lights turning on when people are active to provide safety assurance.

Nande typically recommends combining both solutions in residential area projects: auto-on-at-dusk solar lights for main roads, and motion-sensor solar street lights for narrow alleys and pedestrian areas. This combination ensures overall lighting effectiveness while achieving both energy savings and light pollution control. Nande's motion-sensor solar street lights support three-level sensitivity adjustment, with a sensing distance adjustable from 3-12 meters, allowing flexible settings based on pedestrian traffic volume on different road sections.

Q3: Can solar outdoor lights operate normally during rainy days after installation?

A: Yes, they can operate normally. The key lies in reasonable configuration design.

When designing residential area solar outdoor light solutions, Nande configures sufficiently large battery capacity based on the project location's historical meteorological data to cope with consecutive rainy days. Taking Nande's projects in the Yunnan region as an example, considering that some areas in Yunnan have long consecutive rainy days during the rainy season, Nande configures battery capacity for 5-7 consecutive rainy days, ensuring normal lighting even during the rainy season.

Specific measures include:

• Appropriately increase solar panel power: Configure 20%-30% more than the theoretical calculation value to maximize charging capacity even on overcast days.

• Increase battery capacity: Ensure that stored electricity can cover the power consumption needs during consecutive rainy days.

• Smart dimming function: During consecutive rainy days, the controller automatically reduces brightness (e.g., to 50% power operation) to extend lighting duration.

• MPPT high-efficiency charging: Uses MPPT (Maximum Power Point Tracking) controllers to maximize charging efficiency even under low-light conditions on overcast days.

Nande recommends that if the project location experiences more than 7 consecutive rainy days, priority should be given to LiFePO4 battery solutions during product selection, with appropriately increased solar panel and battery configurations.

Q4: What should I pay attention to when purchasing solar street lights in wholesale quantities?

A: Wholesale bulk purchasing of solar street lights requires attention to the following key points:

First, clarify the usage scenario and lighting requirements. Different locations have different requirements for street lights. Before bulk purchasing, it is necessary to clarify the road width, lighting duration requirements, and environmental conditions of the installation location. Nande provides free product selection guidance services and can offer detailed configuration recommendations based on the buyer's requirements.

Second, emphasize product consistency. Street lights purchased in bulk need to maintain consistency in appearance and performance. As a solar street light factory, Nande has complete production lines and quality control systems, ensuring that bulk products are highly consistent in quality and appearance.

Third, confirm logistics and installation plans. Bulk purchasing requires consideration of transportation and installation issues. Nande can provide full-truckload logistics solutions and detailed installation guidance materials (including video tutorials) to help buyers efficiently complete bulk installation.

Fourth, after-sales service assurance. Bulk-purchased street lights are large in quantity and require a comprehensive after-sales guarantee mechanism. Nande provides a 3-year warranty service. The Official 400 Service Hotline at 400 884 9868 provides 7×12 hours of technical consultation, ensuring worry-free bulk purchasing.

Q5: What is the difference between courtyard solar lights and conventional solar street lights?

A: Courtyard solar lights and conventional solar street lights have distinct differences in design philosophy and usage scenarios:

Height: Courtyard solar lights are typically 0.5-1.5 meters tall, classified as low-height fixtures; conventional solar street lights are 3-10 meters tall, classified as high-position fixtures.

Lighting coverage: Courtyard lights are mainly used for small-area localized lighting, such as garden walkways, courtyard corners, and around flower beds; conventional street lights are used for large-area road lighting, covering road widths of 3-15 meters.

Power and brightness: Courtyard lights typically range from 5W to 30W with lower brightness, creating a cozy ambiance; conventional street lights range from 30W to 150W with higher brightness, meeting traffic safety requirements.

Installation method: Courtyard lights are easy to install, with some models that can be directly staked into the ground without pouring a foundation; conventional street lights require concrete foundation pouring, making installation relatively more complex.

Nande offers both courtyard solar lights and conventional solar street lights, which can be combined and selected based on the different area requirements within a residential area. Courtyard lights are suitable for residential courtyards, community gardens, and landscape walkways, while conventional street lights are suitable for community main roads, parking lots, and public activity areas.

Q6: How can I determine how long a solar street light battery will last?

A: The service life of a solar street light battery mainly depends on three factors: battery type, charge-discharge depth, and operating environment.

Lithium iron phosphate (LiFePO4) batteries are currently the commonly used battery type in solar street lights, with a cycle life of over 2,000 cycles. Calculating at one charge-discharge cycle per day, the theoretical service life can reach 5-7 years. The advantages of LiFePO4 batteries include high safety, long cycle life, and good high-temperature resistance, making them particularly suitable for solar street lights used in southern regions.

Ternary lithium (NMC) batteries have higher energy density, storing more electricity in the same volume, but with a cycle life of approximately 800-1,200 cycles and a service life of about 3-5 years. They are suitable for scenarios with volume and weight requirements.

Methods to extend battery life:

• Avoid deep discharge. Controlling the battery discharge depth within 80% can significantly extend the cycle life.

• Nande's controllers are equipped with a low-battery protection function. When battery level drops to 20%, brightness is automatically reduced; when it drops to 10%, the light fixture is automatically turned off to prevent over-discharge damage to the battery.

• The battery compartment design considers heat dissipation and ventilation to prevent high-temperature environments from accelerating battery aging.

Q7: Will solar street lights with characteristic design poles be very expensive?

A: Solar street lights with characteristic design poles are indeed somewhat more expensive than standard pole models, but through reasonable design, the cost can be controlled within a reasonable range.

Factors affecting cost mainly include:

• Design complexity — The more complex the design, the more welding and processing steps are required, increasing costs. However, through modular design, complex designs can be broken down into standard modules and characteristic modules, with only the characteristic modules undergoing custom processing, controlling overall costs.

• Quantity scale — Bulk customization can amortize mold costs and sampling expenses. Generally, customization can be initiated with 30 units or more, and bulk customization of 100 units or more can reduce the unit price by 15%-20%.

• Surface treatment — Characteristic design poles are recommended to use hot-dip galvanizing + powder coating treatment. Although the cost is slightly higher than ordinary powder coating, the anti-corrosion life can reach 15 years or more, making it more economical in the long run.

Nande has accumulated rich customization experience in the Yunnan characteristic street light project. Through modular design and optimized production processes, the cost of characteristic design poles has been controlled within a reasonable range. For inquiries about characteristic design poles, please contact Manager Mo (Mobile: 189 2534 3352) for solution consultation and quotation.

VII. Contact Information

Zhongshan Nande Solar Lighting Co., Ltd. (Zhongshan Nande Solar Lighting Co., Ltd.) was established in 2000 and has been deeply engaged in the solar lighting field for 26 years. It is a professional solar street light factory integrating R&D, production, sales, and engineering services. The company has 58,000 square meters of factory space, 367 production employees, and annual sales exceeding RMB 500 million. Its products are distributed across 446 cities nationwide and exported to more than 30 countries.

Nande holds 6 core qualifications: ISO9001 Quality Management System Certification (No.: 7697A18Q10585R1M), ISO14001 Environmental Management System Certification (No.: 04618E10188R0S), Construction Enterprise Qualification · Grade II Professional Contractor for Urban and Road Lighting Engineering (No.: D344109724), Work Safety Production License (No.: (Yue) JZ An Xu Zheng Zi [2020] 125118 Yan), China Environmental Labelling Product Certification (No.: CEC2021ELP03717794, Standard HJ2518-2012), and National High-Tech Enterprise Certification.

Whether you are looking for solar outdoor light products, inquiring about solar street light wholesale pricing, or needing residential area lighting solution design, please contact Nande Solar:

• Contact Person: Manager Mo (Mo Jingli)

• Mobile: 189 2534 3352

• Official 400 Service Hotline: 400 884 9868

• Website: //www.nandesolar.com

• Address: Zhongshan City, Guangdong Province

Nande Solar — 26 years of dedication to solar lighting, providing you with a comprehensive product system and professional lighting solutions.