How much do you know about solar street light controllers? Solar controllers are divided into time control and light control. Half-power controllers are used in solar street lights and other lighting systems as well as solar power generation systems. These controllers can prevent significant reductions in lifespan due to battery overcharging and over-discharging. There are several methods for charging the battery with the controller:
1. Constant Current Charging Method
The constant current charging method involves adjusting the output voltage of the charging device or changing the resistance in series with the battery to maintain a constant charging current. This method is straightforward, but since the acceptable current capacity of the battery decreases as charging progresses, in the later stages of charging, much of the charging current is used for electrolysis, producing gas which can lead to excessive outgassing.
2. Constant Voltage Charging Method
In the constant voltage charging process, the voltage of the charging power supply remains constant throughout the charging duration, while the current gradually decreases as the battery terminal voltage rises. Compared to the constant current method, this method is closer to optimal charging standards and produces less electrolysis, preventing battery overcharging. However, the initial current can be excessive, significantly affecting battery lifespan and bending the battery plates, leading to waste.
3. Stage Charging Method
Phase 1: Charge with constant current until a predetermined voltage is reached, then switch to constant voltage to complete the charging. Phase 2 and 3 charging methods: use constant current charging at the beginning and end, with constant voltage charging in the middle. When the current decays to a predetermined value, the method transitions from phase 2 to phase 3. This method minimizes outgassing, but as a fast charging method, it still has certain limitations.
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