The solar charging controller is designed specifically for 12V batteries, including 2V lead-acid batteries, 12V stranded batteries, and 12.8V acid batteries. It utilizes advanced charging technology with maximum power tracking to optimize charging efficiency. The controller has a current rating of 20A and supports battery types with specific charging and floating voltages. It features multiple output options, including USB and TYPE C, with maximum power delivery capabilities for versatile charging needs. The solar charging controller utilizes a new charging technology with maximums power tracking. Specifications: Component: ABS and PC Current: 20A Size: about 104x51x20mm/4.09x2.01x0.79inch 20A Controller Type: Battery voltages: 12V maximums open circuit voltages: 30V Increase charging voltages: leads acid and batteries: 14.4V Lithium iron battery: 14.6v Floating voltages: leads acid and batteries: 13.6-13.8V discharge current: ＜30mA USB output: QC18W (maximums) 5V3A9V2A12V1A5A TYPE C output: PD20W (maximums) 5V3A9V2A12V1A67A Note: 1. First connecting the battery, then connecting the solar panel. When using, pay attention to polarity. If using both the controller and to bare wire, prepare your own polarity converter. Color: As Shown Material: plastic Package Contents: 1* Solar Controllers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.