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Residential streets need 10 lux average illuminance.
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Properly sizing a solar street light requires understanding several key factors: the road width, pole height, pole spacing, local sunshine hours, and the number of rainy days the system must handle. Our solar street light calculator takes all these parameters into account to recommend the right wattage, solar panel size, and battery capacity for your specific project.
The LED wattage needed depends on the road type and width. A residential street typically requires 30-60W, while highways may need 100-150W. The calculator uses IESNA lighting standards to determine the optimal wattage based on lux requirements for each road category. Pole height and spacing also affect the distribution of light, with taller poles requiring higher wattage to maintain ground-level illumination.
The solar panel must generate enough energy during peak sunshine hours to power the LED light through the night and charge the battery for backup. Our calculator estimates panel wattage based on your local daily sunshine hours and the LED power consumption. The LiFePO4 battery capacity is calculated to provide backup power for the specified number of rainy days, ensuring reliable operation even in adverse weather conditions.
All-in-one solar street lights integrate the solar panel, battery, and LED lamp into a single unit for easy installation. They are ideal for residential streets and pathways up to 150W. Split-type solar lights separate the solar panel from the lamp head, allowing for larger panel sizes and higher wattage outputs. They are recommended for main roads, highways, and industrial applications where higher illumination is required.
Learn more about LED heat safety and thermal management. For more detailed guidance, check our Solar Street Light Buying Guide which covers B2B sourcing, specifications, and total cost of ownership analysis.
Get a free solar lighting design with pole layout, product selection, and factory pricing. B2B projects only.
Our installation guide covers pole height, spacing, panel tilt angle, foundation depth, and commissioning.
To calculate solar street light wattage, first determine the required illuminance (lux) for your road type. Multiply the coverage area (pole spacing × road width) by the lux requirement, then apply the maintenance factor (0.8) and utilization factor (0.6) to get the required lumens. Finally, divide the lumens by the LED efficacy (approximately 180 lm/W) to get the required wattage. For example, a 240 m² area at 10 lux needs about 3,200 lumens or 18W of LED power.
The solar panel power needed equals the daily energy consumption (wattage × operating hours) divided by the daily sunshine hours multiplied by a charging efficiency factor of 0.75. For example, a 60W light running 10 hours needs 600Wh per day. With 4.5 sunshine hours, you need approximately 178W of solar panel capacity (600 ÷ (4.5 × 0.75) = 178W). Our calculator handles this automatically.
Battery capacity (Wh) = daily energy consumption × rainy day backup ÷ (depth of discharge 0.85 × controller efficiency 0.8). For example, if your light consumes 600Wh per day and you want 3 days of backup, you need approximately 2,647Wh of battery capacity. LiFePO4 batteries are recommended for their long cycle life (2500+ cycles) and safety.
All-in-one solar street lights integrate the solar panel, battery, LED lamp, and controller into a single compact unit, making installation simple and cost-effective for residential streets, courtyards, and urban side streets (LKL and LKAS series). Split solar street lights separate the solar panel from the lamp head, allowing larger panel and battery configurations for main roads and highways where higher power output is needed (LKH, LFT, and LKA series). Split systems are also easier to maintain as individual components can be replaced independently.
LiFePO4 (lithium iron phosphate) batteries typically last 6 to 8 years in solar street light applications, with 2500+ charge cycles at 80% depth of discharge. They offer better thermal stability, higher safety, and longer lifespan compared to lead-acid or standard lithium-ion batteries. With a proper MPPT controller and 3-year warranty, LiFePO4 is the preferred choice for modern solar street lighting systems.
