Solar street lights are essentially a small power supply system, not a lamp. The four components of the photovoltaic panel, battery, lamp, and controller must be coordinated to determine the volume. The final decision whether the system can withstand the first continuous rainy week is the "battery life days"-that is, the number of days in which the battery needs to support the load without sunshine. Continuous days.

Please start from the local peak sunshine hours rather than the photovoltaic panel nameplate power. A 450W photovoltaic panel generates about 1,575Wh of electricity on sunny days in an area with an average of 3.5 peak hours; deducting battery charge and discharge losses, controller losses and glass dust accumulation, the actual value is closer to 1,100Wh. And a 100-W lamp running at full power overnight consumes about 1,100 Wh-leaving no room for rainy days. This is why almost all reasonably designed solar street lights need to be dimmed in different periods of time: full power in the first few hours of peak traffic at night drops to 30%-50% in the second half of the night, and returns to full power before dawn.

In terms of batteries, lithium iron phosphate has basically replaced lead acid and colloids in new projects, due to cycle life and depth of discharge. Please request the available capacity in watt-hours and the documented number of cycles, rather than the nominal ampere-hours-which are often given at milder discharge rates than actual conditions.

Finally, insist that the controller must be MPPT instead of PWM, and request light distribution files so that the spacing between lights can be clearly calculated before placing an order on the pole.