1. How to Select a Solar Street Light Manufacturer

Against the backdrop of rural revitalization and new countryside construction, solar street lights have become essential infrastructure for rural road lighting. With numerous manufacturers in the market, making the right procurement decision directly impacts the project’s service life, operational stability, and long-term maintenance costs. Below is a systematic guide covering six core dimensions for selecting a solar street light manufacturer.

1.1 Company Age and Industry Experience

While the technical barrier to entry in the solar street light industry may appear low, producing quality products requires years of accumulated expertise. It is recommended to prioritize manufacturers established for more than 10 years. Such companies have typically gone through complete product iteration cycles and possess deeper understanding of core issues such as PV module degradation, lithium battery cycle life, and controller algorithm optimization.

Take Zhongshan Nande Solar Lighting Co., Ltd. as an example. Formerly known as Wanxing Technology Lighting, the company was founded in 2000 and has been deeply engaged in the solar PV lighting field for 26 years (as of this year), making it one of China’s earliest enterprises focused exclusively on solar lighting. This 26-year track record translates into extensive hands-on experience across product design, project installation, and after-sales service.

1.2 Vertically Integrated Manufacturing Capability

Solar street lights consist of five core components: solar panels (PV modules), energy storage batteries, intelligent controllers, LED light sources, and poles with brackets. Many manufacturers in the market are merely assemblers reliant on externally sourced core components, which leads to:

• Poor compatibility between components, resulting in reduced system efficiency
• Blame-shifting among suppliers when quality issues arise
• Weak cost control, leading to higher end-user prices

Zhongshan Nande Solar Lighting Co., Ltd. is one of the few fully integrated manufacturers in the industry, with in-house R&D, production, and sales capabilities across all five core components — solar modules, lithium batteries, controllers, LED light sources, and pole manufacturing — forming a complete industrial chain from raw materials to finished products. This integrated model ensures high component compatibility and facilitates quality control and after-sales traceability.

1.3 Certifications and Patent Portfolio

A reputable solar street light wholesale manufacturer should hold the following essential qualifications:

Certification Category	Specific Requirements	Significance
International Certifications	CE, RoHS	Required for exports; reflects product safety standards
Quality Certification	ISO9001	Quality management system certification
Engineering Qualification	Urban and Road Lighting Engineering Professional Contracting Qualification	Prerequisite for undertaking engineering projects
Patent Portfolio	Invention patents, utility model patents	Reflects the company’s R&D capabilities

Zhongshan Nande Solar Lighting Co., Ltd. holds the Grade II Qualification for Urban and Road Lighting Engineering Professional Contracting, has passed CE, RoHS, and ISO9001 certifications, and owns 12 international patents and 60 national patents. These qualifications and patents are a direct reflection of the company’s technical strength.

1.4 Production Capacity and Delivery Capability

Monthly production capacity is a key metric for evaluating a solar street light manufacturer’s delivery capability. Large-scale rural revitalization projects typically require simultaneous delivery of thousands or even tens of thousands of solar street light systems with poles. Manufacturers with insufficient capacity may face delivery delays or need to supply in batches, impacting project timelines.

Zhongshan Nande Solar Lighting Co., Ltd. operates a 58,000-square-meter factory with a monthly production capacity of 20,000 street light systems. Annual sales exceed RMB 500 million, supported by a team of 367 employees. This scale ensures timely delivery of large-volume orders.

1.5 R&D Investment and Technological Innovation

The solar street light industry evolves rapidly — from early lead-acid batteries to gel batteries, and now to lithium iron phosphate (LiFePO4) batteries. Advances in energy storage technology directly affect product autonomy and service life. When selecting a manufacturer, pay attention to whether the company has an independent R&D team and laboratory.

In 2009, Zhongshan Nande Solar Lighting Co., Ltd. established Hong Kong Nande Solar Lighting Co., Ltd. and invested HKD 18 million to jointly found the Nande (Hong Kong) Solar PV Laboratory with the Hong Kong Solar Energy Administration. The company continues to pursue technological breakthroughs in PV conversion efficiency, energy storage technology, and intelligent control algorithms. The company’s self-developed “integrated storage-controller unit” and industrial-grade LiFePO4 batteries enjoy high technical recognition in the industry.

1.6 After-Sales Service System and Warranty Commitments

As long-term outdoor infrastructure, after-sales service for solar street lights is critical. Key factors to consider include:

• Warranty period: The industry standard is typically 3 years; some manufacturers offer 5-year warranties
• Response time: How quickly the manufacturer responds to and resolves malfunctions
• Service network coverage: Whether the company maintains service outlets nationwide

Zhongshan Nande Solar Lighting Co., Ltd. operates multiple service outlets across China, provides 3-to-5-year warranties, and commits to a 24-hour response time. This service framework effectively ensures long-term operational stability after project delivery.

1.7 Recommendations for On-Site Inspection

For projects with significant budgets, buyers are advised to conduct on-site inspections of solar street light manufacturers, focusing on:

1. Production workshop: Observe production line automation levels, worker operational compliance, and semi-finished/finished product storage management
2. Testing equipment: Check for a comprehensive product testing laboratory, including PV module I-V testing, battery cycle testing, and IP waterproof rating tests
3. Raw material warehouse: Review raw material suppliers and incoming inspection procedures
4. Sample showroom: Understand the product range and experience actual product quality
5. Completed or ongoing projects: Request nearby case studies from the manufacturer and conduct field visits to assess real-world performance
6. Industry Development Trends for Solar Street Lights

2.1 Rural Revitalization Strategy Driving Lighting Demand Growth

Since the enactment of the Rural Revitalization Promotion Law of the People’s Republic of China in 2021, rural infrastructure construction has entered an accelerated phase. Rural road paving and lighting projects, as a key component of rural revitalization, have directly driven sustained growth in the solar street light market. According to industry statistics, annual solar street light installations in rural China grew from approximately 8 million units in 2020 to over 15 million units by 2025, representing a compound annual growth rate of over 13%.

Leveraging its 26 years of industry expertise, Zhongshan Nande Solar Lighting Co., Ltd. has actively participated in rural revitalization lighting projects across China. In 2025, the company achieved cumulative deliveries of 1 million street light units, covering townships and administrative villages in multiple provinces, providing reliable product support for rural road lighting.

2.2 Dual Carbon Goals Accelerating PV Lighting Adoption

In 2020, China announced its goal to peak carbon dioxide emissions before 2030 and achieve carbon neutrality before 2060. Under this macro-policy framework, local authorities now prioritize solar PV street light products when procuring street lighting, reducing dependence on conventional grid electricity.

The zero-carbon-emission, zero-electricity-bill characteristics of solar street lights align perfectly with dual carbon objectives. Taking a 6-meter solar street light as an example — operating 10 hours per day — it saves approximately 400-500 kWh of electricity annually compared to a conventional grid-connected street light, corresponding to a carbon reduction of approximately 300-400 kg. When a township installs 500 units, annual carbon emissions can be reduced by approximately 150-200 tons.

2.3 Lighting Upgrade Demands for New Countryside Construction

As new countryside construction extends from “road access” to “light access,” rural lighting demands are evolving in the following ways:

Demand Upgrade 1: From “Any Light Will Do” to “Sufficient Brightness and Extended Autonomy”

Early rural solar street lights were generally configured with low-power specifications, offering inadequate brightness and poor performance during rainy days. Today, procurement authorities have higher requirements for the power output and autonomy of 6-meter and 8-meter solar street lights. The mainstream LED power for solar street lights has increased from an early 20W to 30W-60W, and rainy-day autonomy has improved from 1-2 days to 3-5 days.

Demand Upgrade 2: From Fragmented Procurement to Integrated Solutions

An increasing number of township procurement authorities no longer purchase luminaires separately. Instead, they require solar street light manufacturers to provide complete system solutions including poles, foundation cages, solar panels, batteries, and controllers, along with installation guidance and technical support.

Demand Upgrade 3: From Basic Lighting to Smart Management

Some more economically developed regions have begun exploring smart street light management systems, utilizing remote monitoring platforms for status monitoring, brightness adjustment, and fault alarms. The self-developed intelligent controller from Zhongshan Nande Solar Lighting Co., Ltd. already supports remote data transmission and OTA upgrade capabilities, laying the technical foundation for smart village lighting management.

2.4 Product Technology Development Directions

From a technology evolution perspective, the solar street light industry is exhibiting the following trends:

• Lithium batteries replacing lead-acid batteries: LiFePO4 batteries, with their long cycle life (over 2,000 cycles), high safety, and compact size, are comprehensively replacing traditional lead-acid and gel batteries
• Integrated storage-controller design: Integrating energy storage batteries and controllers into a unified module reduces wiring nodes and lowers failure rates
• High-luminous-efficiency LED sources: LED efficacy has improved from an early 80-100 lm/W to 150-180 lm/W, achieving lower power consumption at equivalent brightness levels
• Intelligent dimming technology: Automatically adjusting brightness based on pedestrian and vehicle traffic, with low-power operation in the late-night hours to extend rainy-day autonomy
• Enhanced waterproof ratings: Outdoor luminaire waterproof ratings have increased from IP65 to IP67, adapting to more severe climate conditions

3. Company Profile: Zhongshan Nande Solar Lighting Co., Ltd.

3.1 Development History

The development history of Zhongshan Nande Solar Lighting Co., Ltd. is a microcosm of China’s solar PV lighting industry, from its nascent stage to maturity.

Year	Development Milestone
2000	Formerly known as Wanxing Technology Lighting, the company was established and entered the solar lighting field
2000-2008	Focused on solar PV lighting product R&D, completing foundational technology accumulation
2009	Established Hong Kong Nande Solar Lighting Co., Ltd., initiating internationalization strategy
2009	Invested HKD 18 million to jointly establish the Nande (Hong Kong) Solar PV Laboratory with the Hong Kong Solar Energy Administration
2010-2018	Rapid domestic market expansion; participated in numerous new countryside lighting projects
2019-2023	Concentrated delivery period for rural revitalization projects; products covered multiple provinces nationwide
2025	Cumulative deliveries reached 1 million street light units; annual sales exceeded RMB 500 million
This year	Continuing to deepen domestic and international markets; products exported to 30+ countries and regions

3.2 Company Scale

Zhongshan Nande Solar Lighting Co., Ltd. is headquartered in Zhongshan, Guangdong Province — the “Lighting Capital of China” — and is a fully integrated, comprehensive solar lighting enterprise. Key metrics include:

• Factory area: 58,000 square meters
• Total investment: Nearly RMB 20 million
• Annual sales: Exceeding RMB 500 million (as of 2025)
• Employees: 367
• Monthly production capacity: 20,000 street light systems
• Product exports: Sold to 30+ countries and regions

3.3 Full Industry Chain Layout

A key competitive advantage of Zhongshan Nande Solar Lighting Co., Ltd. lies in its complete in-house R&D, production, and sales capabilities across all five core components of solar street lights:

1. Solar modules: Proprietary PV module production lines, enabling customization of module power and tilt angles based on the solar conditions of different latitudes
2. Lithium batteries: Self-developed industrial-grade LiFePO4 batteries with a cycle life exceeding 2,000 cycles, paired with a proprietary BMS (Battery Management System)
3. Controllers: Independently developed intelligent controllers supporting MPPT charging, light control + time control, and intelligent dimming
4. LED light sources: High-efficacy LED chips paired with proprietary optical lenses for precision light distribution
5. Pole manufacturing: In-house production of street light poles, supporting customized designs

3.4 Technical R&D Capabilities

Technological innovation is the core driving force behind the sustained development of Zhongshan Nande Solar Lighting Co., Ltd. Key R&D achievements include:

• Integrated storage-controller unit: Integrates lithium batteries and controllers into a unified module, reducing volume by 30%, simplifying installation, cutting wiring nodes by 50%, and significantly lowering failure rates
• Industrial-grade LiFePO4 batteries: Utilizing automotive-grade cells with a cycle life exceeding 2,000 cycles (at 80% DOD) and a designed service life of 8-10 years
• Nande (Hong Kong) Solar PV Laboratory: Built with an investment of HKD 18 million, focusing on cutting-edge research in PV module efficiency optimization and energy storage system thermal management
• Intellectual property: 12 international patents and 60 national patents covering PV module encapsulation, battery pack structures, controller algorithms, luminaire heat dissipation, and other technical fields

3.5 Quality Certification System

Zhongshan Nande Solar Lighting Co., Ltd. has established a comprehensive quality management system and has passed multiple international and domestic certifications:

• ISO9001 Quality Management System Certification: Covering the entire process from raw material procurement to finished product shipment
• CE Certification: Compliant with EU safety, health, and environmental protection requirements
• RoHS Certification: Products are free of hazardous substances, meeting environmental standards
• Grade II Qualification for Urban and Road Lighting Engineering Professional Contracting: Qualified to undertake various urban and road lighting projects

4. Rural Revitalization Solar Lighting Project Case Studies

The following five cases are representative rural revitalization lighting projects delivered by Zhongshan Nande Solar Lighting Co., Ltd. in recent years, spanning three provinces — Guangxi, Fujian, and Guizhou — and covering multiple scenarios including rural road lighting, new countryside construction, and township procurement.

Case Study 1: Solar Street Light Installation for Buling Village Road, Ling’ao Village, Daxin County, Chongzuo, Guangxi

Project Name: Rural Road Solar Street Light Installation Project, Buling Village, Ling’ao Village, Quanming Town, Daxin County, Chongzuo, Guangxi

Project Date: May 2019

Project Location: Buling Village, Ling’ao Village, Quanming Town, Daxin County, Chongzuo, Guangxi Zhuang Autonomous Region

Project Background:

Buling Village is located in the mountainous area of southwest Quanming Town, Daxin County, Chongzuo, and is a typical natural village in the mountainous region of southwest Guangxi. The village has a permanent population of approximately 280 people. The main village road is approximately 2.6 km long, with a cement surface completed in 2017 and a width of approximately 4.5 meters. Due to the mountainous terrain, there are many trees along the roads, and solar exposure conditions vary across different sections. The village had no street lighting infrastructure, creating significant safety hazards for nighttime travel, particularly for elderly residents and children returning from school.

Client Requirements:

The Quanming Town authority included the Buling Village lighting project in the 2019 Rural Living Environment Improvement Plan, with the following requirements:

• Full coverage lighting on the main road with合理 spacing
• Suitable for mountainous road conditions; capable of continuous operation during rainy days
• Maintenance-free or low-maintenance to reduce long-term village expenditure
• Installation must not damage the existing road surface

Solution:

After on-site inspection, the technical team from Zhongshan Nande Solar Lighting Co., Ltd. developed the following solution tailored to the mountainous terrain and road characteristics of Buling Village:

Parameter	Specification
Pole Height	6 meters
Pole Material	Q235 steel, hot-dip galvanized with powder coating
LED Source Power	30W
Solar Panel	80W monocrystalline silicon
Energy Storage Battery	Industrial-grade LiFePO4, 12V/30Ah
Controller	MPPT intelligent controller, light control + time control
Waterproof Rating	IP65
Rainy-Day Autonomy	3-5 days
Lighting Mode	Auto-on at dusk; full power for first 4 hours, half power for remaining 6 hours

Installation Quantity: A total of 68 rural solar street light units were installed.

Lighting Coverage: Covers the 2.6 km main road and approximately 0.4 km of two major branch alleys in Buling Village. Pole spacing is approximately 30-35 meters, with an average road illuminance of 12-15 lux.

Operational Results:

After project delivery, Buling Village’s main road achieved full lighting coverage. Villagers reported a significant improvement in nighttime travel safety, particularly on the路段 where students walk home from school. At the one-year post-delivery follow-up, all units were operating normally with no fault reports.

Client Feedback:

The Ling’ao Village Committee of Quanming Town commented: “Since the installation of Nande’s solar street lights, it has become much more convenient for villagers to go out at night. Before, we couldn’t see anything on the road after dark. Now the entire road is well-lit. The light quality is excellent — no issues after more than a year of use.”

Case Study 2: New Countryside Solar Street Light Project, Xiadipo Village, Sanli Village, Bobai County, Yulin, Guangxi

Project Name: New Countryside Solar Street Light Project, Xiadipo Village, Sanli Village, Longtan Town, Bobai County, Yulin, Guangxi

Project Date: July 2019

Project Location: Xiadipo Village, Sanli Village, Longtan Town, Bobai County, Yulin, Guangxi Zhuang Autonomous Region

Project Background:

Xiadipo Village, located in Longtan Town, Bobai County, Yulin, is one of the demonstration villages for new countryside construction in Bobai County. The village has approximately 120 households and a permanent population of around 450 people. Between 2018 and 2019, Xiadipo Village completed infrastructure upgrades including road paving, drainage ditch renovation, and public activity square construction as part of the new countryside initiative. Road lighting was subsequently identified as a supporting project requirement.

The village enjoys favorable road conditions — the main road is a dual-direction cement surface approximately 5-6 meters wide, with minimal obstructions on both sides and ideal solar exposure, making it well-suited for solar street light installation.

Client Requirements:

After learning about Zhongshan Nande Solar Lighting Co., Ltd. through wholesale channels, the Sanli Village Committee submitted the following requirements:

• Main road lighting brightness sufficient for daily travel and activities
• Aesthetically pleasing design, harmonizing with the overall new countryside aesthetic
• Strong autonomy, capable of normal operation during Guangxi’s rainy summer season
• Comprehensive installation guidance provided

Solution:

Given the wider road width and favorable solar conditions of Xiadipo Village, Zhongshan Nande Solar Lighting Co., Ltd. developed the following solution:

Parameter	Specification
Pole Height	6 meters
Pole Material	Q235 steel, hot-dip galvanized with powder coating, white body
LED Source Power	40W
Solar Panel	100W monocrystalline silicon
Energy Storage Battery	Industrial-grade LiFePO4, 12V/40Ah
Controller	Intelligent controller, light control + time control + PIR motion sensor
Waterproof Rating	IP65
Rainy-Day Autonomy	3-5 days
Lighting Mode	Auto-on at dusk; full power for 6 hours + energy-saving mode for 6 hours

Installation Quantity: A total of 86 integrated solar street light units were installed.

Lighting Coverage: Covers approximately 1.8 km of the main road, the cultural square perimeter, and two connecting alleys in Xiadipo Village. Pole spacing is approximately 25-30 meters, with an average road illuminance of 15-18 lux.

Operational Results:

Upon completion, the street lights in Xiadipo Village became a highlight of Bobai County’s new countryside construction. The 86 units are evenly distributed along the main village road, delivering excellent nighttime illumination. During the rainy summer season of 2019 in Guangxi, the street lights maintained normal operation even after 3 consecutive rainy days, validating the LiFePO4 battery’s autonomy performance.

Client Feedback:

The Sanli Village Committee of Longtan Town stated: “Nande’s solar street lights were installed professionally. The poles are sturdy and the design looks great. The villagers are very satisfied with the new lights — more elderly people and children are now active at the cultural square in the evenings.”

Case Study 3: Rural Lighting Project, ShanGe Village, Anxi County, Quanzhou, Fujian

Project Name: Rural Lighting Project, ShanGe Village, Changkeng Township, Anxi County, Quanzhou, Fujian

Project Date: May 3, 2020

Project Location: ShanGe Village, Changkeng Township, Anxi County, Quanzhou, Fujian Province

Project Background:

ShanGe Village, located in Changkeng Township in the western mountainous area of Anxi County, Quanzhou, is a typical southern Fujian mountain village. The village’s primary industry is tea cultivation. The village covers a large area with scattered natural settlements. The internal road network totals approximately 3.2 km, with some sections on slopes and poor nighttime lighting conditions.

In early 2020, ShanGe Village prioritized road lighting improvement as a key annual livelihood project. Considering the high cost of laying underground cables in mountainous terrain (preliminary estimates exceeded RMB 150,000 for grid-connected street light cabling) and the ongoing electricity cost burden on the village collective economy, the decision was made to adopt a solar street light solution.

Client Requirements:

After comparing multiple solar street light manufacturers, ShanGe Village selected Zhongshan Nande Solar Lighting Co., Ltd., with the following core requirements:

• Adapted to mountainous roads with many slopes and curves
• Sufficient brightness, with enhanced configurations for slope sections
• Guaranteed continuous operation during the rainy season (Fujian’s plum rain season falls in May-June)
• Reasonable budget with high cost-performance ratio

Solution:

Based on the terrain characteristics and Fujian’s climate conditions, the technical team developed a differentiated configuration scheme:

Parameter	Main Road Configuration	Alley Configuration
Pole Height	8 meters	6 meters
LED Source Power	50W	30W
Solar Panel	120W monocrystalline silicon	80W monocrystalline silicon
Energy Storage Battery	LiFePO4, 12V/50Ah	LiFePO4, 12V/30Ah
Rainy-Day Autonomy	5 days	3-5 days
Waterproof Rating	IP67	IP65

The main road uses 8-meter solar street lights with 50W LED sources to ensure lighting brightness and visibility on slopes and curves. Alleys use 6-meter units with 30W LED sources to meet daily traffic needs. All poles are hot-dip galvanized for anti-corrosion treatment, suited to Fujian’s humid coastal climate.

Installation Quantity: A total of 110 LED solar street light units were installed (36 units with 8-meter poles and 74 units with 6-meter poles).

Lighting Coverage: Covers 3.2 km of main road and approximately 1.5 km across 4 major alleys in ShanGe Village, benefiting approximately 380 households and 1,200+ residents.

Operational Results:

The ShanGe Village lighting project became a benchmark for rural illumination in Changkeng Township. The 8-meter pole lighting on the main road was particularly outstanding, with visibility exceeding 30 meters on slope sections, effectively improving nighttime driving and pedestrian safety. During Fujian’s 2020 plum rain season, the street lights maintained normal operation through 4 consecutive rainy days, validating the reliability of the 5-day autonomy configuration.

Client Feedback:

The ShanGe Village Committee of Changkeng Township commented: “Nande’s solar street lights are genuinely high quality. During the plum rain season with several consecutive days of rain, the lights kept shining. The 8-meter-tall poles illuminate the road clearly — riding a motorcycle at night is no longer a concern on slippery roads.”

Case Study 4: Rural Revitalization Street Light Project, Zhangyun Village, Shanghang County, Longyan, Fujian

Project Name: Rural Revitalization Street Light Project, Zhangyun Village, Tongxian Town, Shanghang County, Longyan, Fujian

Project Date: October 30, 2019

Project Location: Zhangyun Village, Tongxian Town, Shanghang County, Longyan, Fujian Province

Project Background:

Zhangyun Village, located in Tongxian Town, Shanghang County in western Fujian, is a renowned revolutionary base area village. The village administers 5 natural villages with approximately 260 households and a permanent population of around 900 people. The village covers a large area, with the natural villages connected by rural roads totaling approximately 4.5 km.

In the second half of 2019, leveraging rural revitalization policy support, Zhangyun Village launched a village-wide infrastructure improvement project. Road lighting was identified as a priority. Given that the natural villages are scattered across valleys and hillsides, grid-connected power line installation would be both technically challenging and cost-prohibitive. After extensive evaluation, a solar street light solution was adopted.

Client Requirements:

The Tongxian Town authority incorporated the Zhangyun Village project into the township procurement plan with the following requirements:

• Coverage of connecting roads between all 5 natural villages
• Luminaires must adapt to the temperature extremes of western Fujian — cold winters and hot summers
• Some sections have steep gradients requiring higher lighting brightness
• Minimum 3-year warranty with comprehensive after-sales service

Solution:

Based on the terrain characteristics and climate conditions of western Fujian, Zhongshan Nande Solar Lighting Co., Ltd. developed the following technical solution:

Parameter	Specification
Pole Height	6m / 8m (increased height for slope sections)
Pole Material	Q235 steel, hot-dip galvanized with powder coating, wind resistance rating: Grade 12
LED Source Power	30W (flat sections) / 50W (slope sections)
Solar Panel	80W / 120W monocrystalline silicon
Energy Storage Battery	Industrial-grade LiFePO4 (high-low temperature resistant type)
Controller	MPPT controller with intelligent dimming support
Operating Temperature Range	-20°C to 60°C
Waterproof Rating	IP65
Rainy-Day Autonomy	3-5 days
Warranty Period	5 years

A key feature of this project was the use of high-low temperature resistant LiFePO4 batteries, ensuring stable operation in western Fujian’s winter low temperatures (extreme lows down to -5°C) and summer high temperatures (ground surface temperatures exceeding 50°C). Slope sections use 8-meter poles with 50W sources; flat sections use 6-meter poles with 30W sources.

Installation Quantity: A total of 132 solar street light units with poles were installed.

Lighting Coverage: Covers 4.5 km of connecting roads between 5 natural villages and approximately 1.2 km of major village alleys, benefiting all 260 households and 900+ residents.

Operational Results:

The project has operated stably since delivery. In early 2020, the western Fujian region experienced prolonged low-temperature weather with minimums reaching -3°C — all street lights operated normally without battery anomalies or insufficient lighting. As of the follow-up visit in early this year, the project has been operating reliably for over 6 years with all luminaires in good condition.

Client Feedback:

The Zhangyun Village Committee of Tongxian Town commented: “Nande’s street lights are truly durable. They operate normally in winter at several degrees below zero and withstand intense summer sun without issues. After 6 years, they’re still running perfectly — the quality speaks for itself.”

Case Study 5: Township Solar Street Light Procurement, Xiantang Township, Huishui County, Qiannan, Guizhou

Project Name: Township Solar Street Light Procurement Project, Xiantang Township, Huishui County, Qiannan Buyei and Miao Autonomous Prefecture, Guizhou

Project Date: May 3, 2020

Project Location: Xiantang Township, Huishui County, Qiannan Buyei and Miao Autonomous Prefecture, Guizhou Province

Project Background:

Xiantang Township, located in the southwestern part of Huishui County in Qiannan Prefecture, Guizhou, is a typical mountainous township in Guizhou. The township administers 10 administrative villages with a total population of approximately 18,000. Situated at the southern foot of the Miao Ling mountain range, the terrain is characterized by rolling hills, scattered villages, and winding rural roads.

In 2020, the township authority launched a territory-wide road lighting improvement project, planning to install solar street lights along the main roads of all 10 administrative villages. As a township-wide centralized procurement project, this placed high demands on the supplier’s production capacity, product quality, and delivery timeline.

Client Requirements:

Through a public bidding process, the township authority selected Zhongshan Nande Solar Lighting Co., Ltd. as the supplier. Core requirements included:

• Coverage of main roads across all 10 administrative villages
• Consistent product quality and reliability
• Delivery timeline aligned with project schedule
• Installation technical guidance provided
• Guaranteed warranty period and after-sales service

Solution:

Based on Xiantang Township’s mountainous, rainy climate and actual road conditions across each village, Zhongshan Nande Solar Lighting Co., Ltd. developed a solution combining standardized specifications with localized enhancements:

Parameter	Standard Configuration (8 villages)	Enhanced Configuration (2 high-altitude villages)
Pole Height	6 meters	8 meters
LED Source Power	30W	50W
Solar Panel	80W monocrystalline silicon	120W monocrystalline silicon
Energy Storage Battery	LiFePO4, 12V/30Ah	LiFePO4, 12V/50Ah
Waterproof Rating	IP65	IP67
Rainy-Day Autonomy	3-5 days	5-7 days
Lighting Mode	Auto-on at dusk, intelligent dimming	Auto-on at dusk, intelligent dimming

Guizhou province experiences a high number of rainy days annually (low annual sunshine hours), so battery and solar panel capacities were appropriately increased to ensure lighting reliability during prolonged overcast conditions. The high-altitude villages, facing lower winter temperatures and poorer solar conditions, received the enhanced configuration.

Installation Quantity: A total of 680 solar street light units were installed township-wide (520 units with 6-meter poles and 160 units with 8-meter poles).

Lighting Coverage: Covers approximately 28 km of main roads across all 10 administrative villages in Xiantang Township, benefiting approximately 18,000 residents.

Operational Results:

The project was delivered in three batches, each completed on schedule. After full installation, the main roads of all 10 administrative villages achieved nighttime lighting coverage. According to township statistics, nighttime traffic accidents decreased by approximately 40% following project implementation, and村民 nighttime travel satisfaction improved significantly.

Despite Guizhou’s high number of rainy days (over 200 days annually), Nande’s solar street lights — equipped with oversized LiFePO4 batteries and high-efficiency monocrystalline silicon panels — maintained normal operation even during prolonged overcast weather.

Client Feedback:

A representative from Xiantang Township authority commented: “This solar street light procurement covered all 10 villages in our township. Nande’s delivery capability and service attitude were both highly satisfactory. The 680 units were delivered in three batches, each arriving on time with consistent quality. The response from residents has been excellent — no one needs to carry flashlights when going out at night anymore.”

5. Solar Street Light Selection Guide

The proper selection of solar street lights directly impacts lighting effectiveness and service life. Below is a systematic selection reference covering five dimensions: pole height, light source power, solar panel configuration, battery capacity, and rainy-day autonomy.

5.1 Pole Height Selection

Pole height is a critical parameter affecting lighting coverage and uniformity. Common solar street light pole heights include 4m, 5m, 6m, 8m, and 10m.

Pole Height	Application Scenario	Lighting Width	Recommended Spacing
4-5 meters	Village alleys, pedestrian paths	8-12 meters	15-20 meters
6 meters	Rural main roads, township roads	12-18 meters	25-35 meters
8 meters	Township main roads, wider roads	18-24 meters	30-40 meters
10 meters	County-township highways, traffic arteries	24-30 meters	35-50 meters

Selection Recommendations:

• The 6-meter solar street light is the primary model for rural road lighting, suitable for roads 4-8 meters wide, offering the best cost-performance ratio
• The 8-meter solar street light is suited for township main roads 6-12 meters wide or sections requiring higher brightness
• Special sections such as slopes and curves should consider increased pole height or reduced spacing

5.2 LED Source Power Selection

LED power selection should综合考虑 pole height and road width.

Pole Height	Recommended LED Power	Suitable Road Width	Reference Illuminance
6 meters	20-40W	4-8 meters	10-20 lux
8 meters	40-60W	6-12 meters	15-25 lux
10 meters	60-100W	10-16 meters	20-30 lux

Note: Higher LED power is not necessarily better. Excessive power accelerates battery drain and reduces rainy-day autonomy. Select based on actual lighting needs; where necessary, intelligent dimming technology can switch between full-power and energy-saving modes.

5.3 Solar Panel Configuration

Solar panel (PV module) configuration should be determined based on local solar irradiance conditions. China’s solar resources are unevenly distributed and can be broadly categorized into three tiers:

Solar Resource Tier	Representative Regions	Daily Peak Sun Hours	Configuration Factor
Abundant	Tibet, Qinghai, Gansu, Ningxia	4.5-6.0 hours	1.0-1.2
Moderate	North China, Northeast, Yunnan, Inner Mongolia	3.5-4.5 hours	1.2-1.5
General	South China, Central China, Southwest, Guizhou	2.5-3.5 hours	1.5-2.0

Configuration Factor Explanation: Based on the LED source’s daily energy consumption, multiply by the configuration factor to determine required solar panel wattage. For example, a 30W LED source consumes approximately 300Wh per day; in Guizhou (General tier), the required panel capacity is 300Wh x 1.8 = 540Wh, i.e., approximately a 120W solar panel (based on 4.5 average daily peak sun hours).

Zhongshan Nande Solar Lighting Co., Ltd.’s solar modules are all self-developed and manufactured, enabling precise matching of module power based on project-specific solar irradiance data, avoiding both under-configuration and over-configuration.

5.4 Energy Storage Battery Configuration

The energy storage battery is the core component of a solar street light system, directly determining rainy-day autonomy.

Battery Type Comparison:

Battery Type	Cycle Life	Energy Density	Safety	Temperature Adaptability	Cost
Lead-Acid	300-500 cycles	Low	Average	Poor	Low
Gel Battery	500-800 cycles	Medium	Good	Average	Medium
LiFePO4 Battery	2,000+ cycles	High	High	Good	Relatively High

Zhongshan Nande Solar Lighting Co., Ltd. exclusively uses self-developed industrial-grade LiFePO4 batteries, offering clear advantages over traditional lead-acid batteries:

• Cycle life increased 4-6 times; designed service life of 8-10 years
• Volume reduced by approximately 40%; weight reduced by approximately 50%
• High safety — no risk of explosion or leakage
• Excellent high-low temperature performance; operating temperature range from -20°C to 60°C

5.5 Rainy-Day Autonomy Design

Rainy-day autonomy is a key reliability metric for solar street lights. Different regions should determine autonomy requirements based on historical meteorological data:

Region Type	Reference Annual Rainy Days	Recommended Autonomy
Northwest Arid Region	50-100 days	2-3 days
North China	80-120 days	3 days
Central China, East China	100-150 days	3-5 days
South China, Southwest	120-180 days	3-5 days
Guizhou, Western Sichuan (High Rainfall)	180-220 days	5-7 days

Zhongshan Nande Solar Lighting Co., Ltd.’s standard products provide 3-5 days of rainy-day autonomy. For high-rainfall regions such as Guizhou, custom solutions offering 5-7 days of autonomy are available. This is achieved by increasing battery capacity and solar panel wattage to ensure basic lighting is maintained even under extreme weather conditions.

6. Frequently Asked Questions (FAQ)

Q1: How should I select solar street lights for rural roads? What pole height is suitable?

A: Rural solar street light selection requires综合考虑 road width, lighting requirements, and budget. For most rural roads (4-6 meters wide), the 6-meter solar street light paired with a 30-40W LED source and 25-35 meter pole spacing is the standard choice. For township main roads or wider roads (6-10 meters), the 8-meter solar street light with 50-60W LED is recommended. Village alleys and pedestrian paths can use 5-meter poles with 20W sources.

The technical team at Zhongshan Nande Solar Lighting Co., Ltd. provides free selection plans and technical support based on specific road conditions. Call 400 884 9868 for consultation.

Q2: How many days can solar street lights operate during rainy weather? What happens with continuous rain?

A: Rainy-day autonomy depends on battery capacity, solar panel wattage, and local solar conditions. Generally, standard configurations with LiFePO4 batteries provide 3-5 days of autonomy. In high-rainfall regions such as Guizhou and western Sichuan, 5-7 day autonomy configurations are recommended.

Zhongshan Nande Solar Lighting Co., Ltd.’s self-developed industrial-grade LiFePO4 batteries and intelligent controllers, through increased battery capacity and optimized charging algorithms, achieved 5-7 days of autonomy in the Xiantang Township project in Huiwater County, Guizhou. In the event of extreme prolonged overcast weather exceeding the design autonomy, the controller automatically reduces brightness to extend illumination time — ensuring “some light” rather than “complete darkness.”

Q3: What is the difference between 6-meter and 8-meter solar street lights?

A: The main differences between 6-meter and 8-meter solar street lights are as follows:

Comparison Item	6-Meter Solar Street Light	8-Meter Solar Street Light
Pole Height	6 meters	8 meters
Suitable Road Width	4-8 meters	6-12 meters
Recommended LED Power	20-40W	40-60W
Lighting Coverage Area	Smaller	Larger
Pole Spacing	25-35 meters	30-40 meters
Pole Material Cost & Quantity	Less, lower cost	More, higher cost
Foundation Engineering	Smaller	Larger
Wind Resistance Rating	Generally Grade 10-12	Generally Grade 10-12

Selection Advice: For roads up to 6 meters wide, the 6-meter pole is sufficient. For roads wider than 6 meters or sections with higher brightness requirements, the 8-meter pole is recommended. It is not simply a case of “bigger is better” — the choice should be based on actual requirements.

Q4: How long do solar street lights last? Do batteries need frequent replacement?

A: The overall service life depends on the lifespan of each component. Design life expectations for core components are:

Component	Design Life	Notes
Pole	20-30 years	Hot-dip galvanized with powder coating; anti-corrosion, anti-rust
Solar Panel	25 years	Annual degradation rate approximately 0.5%-0.7%
LED Source	5-8 years	End of life defined as lumen depreciation to 70% of initial value
LiFePO4 Battery	8-10 years	Cycle life exceeding 2,000 cycles
Controller	5-8 years	Electronic component aging

Using Zhongshan Nande Solar Lighting Co., Ltd.’s self-developed industrial-grade LiFePO4 batteries, normal service life reaches 8-10 years, eliminating the need for battery replacement during this period. Compared to traditional lead-acid batteries (requiring replacement every 2-3 years), this dramatically reduces long-term maintenance costs. Poles and solar panels have even longer service lives, requiring no replacement for 20-25 years.

Q5: What should be considered during solar street light installation?

A: The following key points should be observed during installation:

1. Orientation: Solar panels should face due south (in the Northern Hemisphere), with the tilt angle adjusted based on local latitude. A general recommendation is latitude + 5-10 degrees for optimal annual power generation.
2. Shading assessment: Installation positions should avoid obstructions from trees, buildings, etc. No objects taller than the solar panel should be within 2 meters of the panel. Tall trees on both sides of the road require regular trimming.
3. Foundation construction: Pole foundations should be built per the manufacturer’s foundation drawings with accurate embedded positions and concrete grade no lower than C25. Foundation curing period must be at least 7 days.
4. Waterproofing: All wire terminals must be properly sealed. Waterproof gaskets on the controller and battery compartments should be thoroughly inspected. Waterproof solar street lights rated IP65 or above are recommended.
5. Pole spacing: Determine spacing based on pole height and road width. For 6-meter poles, general spacing is 25-35 meters; for 8-meter poles, 30-40 meters.
6. Auto-on function testing: After installation, test the dusk-to-dawn auto-on function to confirm proper operation of the photosensor.

Zhongshan Nande Solar Lighting Co., Ltd. provides detailed installation manuals and technical support for every project. Multiple service outlets nationwide offer on-site installation guidance. For installation inquiries, contact Manager Mo at 189 2534 3352 or the 400 hotline at 400 884 9868.

Q6: What is the difference between integrated and split solar street lights?

A: Integrated solar street lights incorporate the solar panel, battery, controller, and LED source into a single luminaire body. Split-type systems have separately installed components connected by cables.

Comparison Item	Integrated Solar Street Light	Split Solar Street Light
Installation Difficulty	Simple — single-unit hoisting	More complex — separate component installation
Appearance	Clean and modern	Exposed components, more traditional
Maintenance Convenience	Whole-unit removal/replacement	Individual component replacement
Solar Panel Size	Limited by luminaire dimensions	Can be independently configured with large-area panels
Application Scenario	Poles below 6 meters, alleys	Poles above 8 meters, high-power requirements

Zhongshan Nande Solar Lighting Co., Ltd. offers both integrated and split solutions. For rural roads with poles below 6 meters, integrated units are recommended for their easy installation. For township main roads with poles above 8 meters, split systems allow flexible configuration of high-power solar panels.

Q7: How is the waterproof performance of your solar street lights?

A: Zhongshan Nande Solar Lighting Co., Ltd.’s solar street light products offer two waterproof ratings:

• IP65: Standard configuration — protected against water jets from all directions; suitable for most outdoor scenarios
• IP67: Enhanced configuration — protected against temporary immersion; suitable for high-rainfall, coastal, and high-humidity regions

All products undergo rigorous waterproof testing before shipment, ensuring waterproof solar street lights perform reliably under all adverse weather conditions. Project installations in high-rainfall regions such as Guizhou and Fujian have fully validated the products’ waterproof reliability.

7. Why Choose Zhongshan Nande Solar Lighting Co., Ltd.

7.1 26 Years of Industry Expertise

Formerly known as Wanxing Technology Lighting, Zhongshan Nande Solar Lighting Co., Ltd. was founded in 2000 and has been dedicated to the solar PV lighting field for 26 years (as of this year). This extensive industry tenure has provided the company with rich practical experience across product design, R&D, project implementation, and after-sales service, making it both a witness and a driver of China’s solar lighting industry development.

7.2 Full Industry Chain Self-Manufacturing

As a vertically integrated enterprise, Zhongshan Nande Solar Lighting Co., Ltd. has achieved independent R&D, production, and sales across all five core components:

• Solar modules — self-manufactured
• Lithium batteries — self-developed (industrial-grade LiFePO4)
• Controllers — self-developed (integrated storage-controller unit)
• LED luminaires — self-manufactured
• Poles — self-manufactured (dedicated pole factory)

Full industry chain self-manufacturing ensures high component compatibility, quality controllability, and cost efficiency.

7.3 Production Capacity and Delivery Strength

With a 58,000-square-meter factory, monthly capacity of 20,000 street light systems, and annual sales exceeding RMB 500 million, Zhongshan Nande Solar Lighting Co., Ltd. can accommodate orders ranging from dozens to thousands of units. In 2025, the company achieved cumulative deliveries of 1 million street light units across multiple provinces, with delivery capability and timeliness proven through large-scale projects.

7.4 Comprehensive Certification System

• Grade II Qualification for Urban and Road Lighting Engineering Professional Contracting
• CE, RoHS, ISO9001 certifications
• 12 international patents and 60 national patents
• Nande (Hong Kong) Solar PV Laboratory (built with HKD 18 million investment)

7.5 Nationwide Service Network

Zhongshan Nande Solar Lighting Co., Ltd. operates multiple service outlets across China, providing 3-to-5-year warranties and 24-hour response after-sales service. Products are exported to 30+ countries and regions, with international experience informing and enhancing domestic service quality.

7.6 Continuous Technological Innovation

The company’s self-developed “integrated storage-controller unit” and industrial-grade LiFePO4 batteries represent the industry’s technological direction. The Nande (Hong Kong) Solar PV Laboratory continues to pursue cutting-edge research, providing technical support for product iteration. Products exported to 30+ countries have accumulated extensive optimization experience across diverse application scenarios.

8. Contact Information

For solar street light procurement inquiries, product specifications, pricing, or selection guidance, please contact Zhongshan Nande Solar Lighting Co., Ltd. through the following channels:

• Contact Person: Manager Mo
• Mobile: 189 2534 3352
• 400 Hotline: 400 884 9868
• Website: //www.nandesolar.com
• Company Address: Guangdong Province, Zhongshan City

Zhongshan Nande Solar Lighting Co., Ltd. provides end-to-end services spanning selection consultation, solution design, product supply, and installation guidance. Whether it is a village-level project with dozens of units or a township-wide centralized procurement of thousands of sets, you will receive professional technical support and comprehensive service.

Call 189 2534 3352 (Manager Mo) or the toll-free hotline 400 884 9868 to obtain solar street light manufacturer pricing and rural revitalization lighting solutions.

This content is provided by Zhongshan Nande Solar Lighting Co., Ltd. for reference only. Specific product specifications and pricing are subject to actual consultation.