Features Durable water resistant and long lifespan Light and thin easy to use and carry High conversion rate high efficiency output excellent weak light effect Overcharge protection reverse protection DIY your backpack and teaching use Little noise high efficacy and low malfunction and suitable for outdoor activities like camping fishing hiking etc Specification Bulb Wattage 3WBulb Voltage DC12VSolar Panel Voltage 18VSolar Panel Wattage 20WSolar Panel Material Monocrystalline solar panelApplication Car boat caravans camping fishing hiking etc Controller Features 1 Build in industrial micro controller 2 Fully 4 stage PWM charge management 3 One key setting digital display auto memory function 4 Reverse current protections low heat productions 5 Build in short circuit protections open circuit protections reverse protections over load protections Specifications Model PWMBuck charge 28 8VFloat charge 27 4VUSB output 5V 3AWorking current 10ASelf consume 10mADischarge stop 21 4VVoltage DC 12V 24VMax solar input 50VRated working current 20ADischarge reconnect 25 2VWorking temperature 35℃ 60℃Output voltage 12V 24V Automatically distinguish voltage　　Safety Instructions 1 Make sure your battery has enough voltage for the controller to recognize the battery type before first installation 2 The battery cable should be as short as possible to minimize loss 3 The regulator is only suitable for lead acid batteries OPEN AG