solar controller, auto-identify 12V and 24V, 20A, three years' warranty Product Name: solar controller (12V/24V auto-indentified, 20A)Model: STK-20 Description: Microchip's MCU is used for the solar controller. With its all action Controlled by software, the controller has a higher accuracy and higher stability.This controller's can automatically identify voltages, which avoids system mismatching ...