How to use it? First connected battery; Second connected solar panel; Third connected load. How to adjust the float voltage? Step 1: The system default float voltage is 13.7V, but you can change it according to your needs. Press MENU to enter the parameter page and find the floating charge voltage page. Step 2: In floating charge voltage interface long press 3-5 seconds MENU to enter setting and using UP or DOWN to set the floating voltage Rated Voltage 12V/24V Input Current 10A Output Current 10A Max PV Voltage 50V Max PV Input Power 130W( 12V ) 260W( 24V ) USB Output 5V/2A Self-consume > Load output 24 hours Mode 2 : [1-23HR] >> Load on aftersunset and dosed after setting hours Mode 3 : [0H] >> Dusk to Dawn Solar Charge Controller USB 12V 24V Auto 20A Add to Cart Customer Reviews 3.9 out of 5 stars 19 Price $8.99$8.99