IP68 Rated Waterproof, this Intelligent 4-stage PWM solar charging controller is suitable for outdoor use,you can use it for solar fencing system, solar monitoring system, solar lighting system or other solar system.It has short circuit protection, over charge protection, over discharge protection, reverse protection. Can extends battery life time.Can automatically senses 12V or 24 Volt for your batteries, working mode of the solar charge regulator is 24 hours.With short cables for connecting with solar panel, battery and load, and three LED lights can help you to know solar charging status, battery level, and load status.Easy to mount directly on the frame of the solar panel, with heat sink design at bottom and 2pcs mounting holes. its small size also can saves you some space. Safety Instructions: A) Make sure your battery has enough voltage for the waterproof solar charge controller to recognize the battery type before first installation only sufficient battery voltage can charge or activate the controller. That means it won't charge or activate when hooked to a dead or no-voltage battery. B) The battery cable should be as short as possible to minimize loss. C) The regulator is only suitable for lead acid batteries: OPEN,AGM, GEL It is not suited for nickel metal hydride, lithium ions or other batteries. D) The charge regulator is only suitable for regulating solar panels. Never connect another charging source to the charge regulator. How to connect solar system with the controller: Step 1:Connect the battery to the solar charge controller firstly- plus and minus.(it will auto adapts to the battery voltage) Step 2: Connect the load to the controller secondly. Step 3: Connect the solar panel to the controller finally - plus and minus. Note: The reverse order applies when deinstalling. Specification: ◆ Color: Black ◆ Rated Charging Current: 20A ◆ Rated Discharging Current: 20A ◆ Max Solar Input Voltage: ＜50V ◆ System Voltage: 12V/24V Auto Adapt ◆ Self consume: ＜10mA ◆ Operating Temperature: -20 ~+60℃ ◆ Equalize Charging Voltage: 14.4V/28.8V ◆ Bulk Constant Charging Voltage: 14.2V/28.4V ◆ Float Charging: 13.8V/27.6V ◆ Discharge Stop Voltage: 11.2V/22.4V ◆ Discharge Reconnect Voltage: 12.6V/25.2V ◆ Housing: Aluminum alloy ◆ Maximum Wire Size: 16AWG ◆ Size/Weight: 82x45x21mm/120g Package Include： ● 1 X 20A Waterproof Solar Charge Controller ● 1 X User Manual