... 12V and 24V, 20A, three years' warranty Product Name: solar controller (12V/24V auto-indentified, 20A)Model: STK-20 Description: Microchip ... lifetime of the whole system would be extended. The solar controller is applied to solar street light, solar garden light, solar ... light control plus PWM function. When PWM works, the solar controller can adjust the output power to half in later night ...