Solar Panel: Specifications: Material: Monocrystalline silicon Size: Approx.23cmx17cm/9.0x6.6 inch Voltage: 12V Maximum power: 20W Maximum protection level: 5A Maximum voltage: 18V Features: 1.Durability, waterproof and longevity. 2.Lightweight and easy to use, and easy to carry. 3.High conversion rate, high efficiency calculation, excellent efficiency. 4.Use overcharge protection, protection in the opposite direction. 5.Small noise, high efficiency. 6.Ideal for outdoor cycling, hiking, hiking, camping, travel, etc. 20A Controller : Specifications: Model: PWM Buck charge: 28.8V Float charge: 27.4V USB output: 5V/3A Working current: 10A Self-consume: <10mA Discharge stop: 21.4V Voltage: DC 12V/24V Max solar input: <50V Rated working current: 20A Discharge reconnect: 25.2V Working temperature: -35~60 Output voltage: 12V/24V Automatically distinguish voltage 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. 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, AGM, GEL(It is not suited for nickel metal hydride, lithium ions or other batteries). 4.The charge regulator is only suitable for regulating solar modules. Never connect another charging source to the charge regulator. System Connection: 1.Connect the battery to the charge regulator - plus and minus.it will show 1 ,if it detects 12V battery, 2 if it detects 24V battery. 2.Connect the photovoltaic module to the regulator - plus and minus. 3. Connect the consumer to the charge regulator - plus and minus. Package Included: 1 x solar panel 1 x battery clip 1 x Controller Notice: - Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. - Please understand that colors may exist chromatic aberration as the different placement of pictures.