40W solar street lights are commonly designed as "All-in-One" (AIO) systems where the solar panel, battery, and LED driver are integrated into a single unit. These lights typically provide between 4,000 and 6,400 lumens and are intended for mounting heights of 4 to 6 meters.
Key Technical Specifications
Integrated systems vary by manufacturer, but a standard high-quality 40W configuration generally includes the following components:
- Solar Panel: Typically uses a Monocrystalline (higher efficiency) or Polycrystalline panel ranging from 20W to 75W depending on the required backup time.
- Battery: Most modern units utilize LiFePO4 (Lithium Iron Phosphate) batteries, often with a capacity of 24Ah to 40Ah at 12.8V, offering better thermal stability and a longer cycle life than standard Li-ion.
- LED Luminous Efficacy: High-efficiency LEDs often achieve 130–150 lumens per watt, ensuring a total output of roughly 6,000 lumens.
- Controller: Most premium models use an MPPT (Maximum Power Point Tracking) charge controller to optimize energy harvest from the solar panel.
- Sensors: Inbuilt PIR (Passive Infrared) or Microwave motion sensors are common, allowing the light to dim to 30% brightness when no movement is detected to conserve battery.
