What parameters are in the design solar lights Part 2
6. LED lamp holder power
It is the lamp holder power or controller drive efficiency, which is determined according to the specific installation environment. The higher the lamp pole, the better the lighting effect, and the higher the lamp holder power is naturally required.
7. Load working hours per day
Nowadays, solar street lights are all intelligently designed. They are usually brighter when the night is relatively lively. At this time, they usually work at 100% full power. When the night is quiet, the brightness is lower, and they may only work at 50% power. When calculating, go to the equivalent full power working time.
8. Controller component charging efficiency
Controller charging control methods generally have two types: PWM and MPPT. The two corresponding charging efficiencies are different. PWM has a three-stage charging method: strong charging, balanced charging, and floating charging, which can solve the problem of battery charging. The problem of short service life, but the charging efficiency is not as good as MPPT.
The charging stage of the MPPT solar controller is divided into MPPT charging, constant voltage equalizing charging and constant voltage floating charging phases, which can allow the system to always charge the battery with maximum power, so the charging efficiency is also very high, and the price is several times or even several times that of PWM Ten times, you still have to come according to your own needs, and the relevant parameters are based on specific components.
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9. Controller component drive efficiency
As a reference basis for calculating the lamp cap power and setting the lamp cap drive current.
10. Battery conversion efficiency
The corresponding efficiency of different batteries is different. Now solar street lights are generally integrated in design. The conversion efficiency of the supporting battery lithium iron phosphate battery is much higher than that of the lead-acid battery in the past, generally 92% to 95% between.
11. Battery capacity
The size of the battery capacity is also the focus of attention. If the capacity is too small, it cannot meet the needs of night lighting; if the capacity is too large, the battery will always be in a state of power loss, which will cause waste and affect the battery life.
The ratio of battery capacity (Ah) to load capacity (Ah) should be more than 3-6 times. If the number of continuous rainy days is less in the installation area, 3 to 4 times or more is sufficient. If there are more continuous rainy days, then at least 5 to 6 times or more.
12. Comprehensive loss compensation coefficient
This is generally due to line loss, dust, shadow occlusion, battery Coulomb efficiency, and some effects caused by temperature. When calculating related parameters, the value is generally between 1 and 1.4
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Some other parameters are also involved in the cumulative battery discharge depth. For lithium batteries that are commonly used now, it is recommended that the discharge depth be around 90%. After understanding these parameters, it can help merchants better understand the needs of customers and select a configuration suitable for the installation environment.