This is a practical solar system controller. It has a built-in industrial micro controller chip and fully 3-stage PWM charge management. The build-in short-circuit protections and over-load protections is more safe for using. It can be applied to solar road lamp, solar pest killing lamp, solar plate installation and so on.

Features:
Adopt industrial micro controller chip.
Large LCD screen for display.
Auto memory function.
Fully 3-stage PWM charge management.
Dual USB charge port.
Build-in short-circuit protections, open-circuit protections, reverse protections and over-load protections.
Dual mosfet reverse current protections and low heat productions.

Specifications:
Type: 1(10A), 2(20A), 3(30A) (optional)
Material: plastic
Color: blue & black
Rated voltage: 12V 24V auto
Application: solar system controller
Current:  10A / 20A/ 30A
USB output: 5V/3A
Standby current: ＜ 10mA
Working temp: -35~+60 ℃
Floating charge voltage: 13.7V (adjustable)
Discharge up to voltage: 10.7V (adjustable)
Discharge recovery voltage: 12.6V (adjustable)
Item size: 14.8 * 7.8 * 1.5cm / 5.83 * 3.07 * 0.59in
Item weight: 150g / 5.29oz
Package size: 15 * 7.8 * 3.5cm / 5.9 * 3.07 * 1.38in 
Package weight: 180g / 6.35oz

Package List: 
1 * Solar Charge Controller
1 * User Manual