?High Conversion Rate?This 20W solar panel with monocrystalline A+ solar cell has an excellent cell efficiency of 21%-30%. Designed to charge and maintain 12V rechargeable batteries like LiFePO?, Lithium Ion, AGM, SLA, GEL, EFB, MF, etc. Keep batteries in charged for trailer, tractor, truck, boat, motorcycle, RV, car, lawn mower, water pump, gate opener, electric fence, etc ?Built to Last? Low-iron tempered glass surface and corrosion-resistant aluminum frame, make this solar panel 100% waterproof and rustproof, and provide the prolonged lifespan up to 25 years. This 12V solar panel can withstand all weather conditions such as sandstorm, strong wind, thunderstorm, blizzard, hail, etc. It can withstand up to 2400Pa wind pressure and 5400Pa snow load ?Smart Charge Controller?The charging efficiency of this upgraded 8A controller is 20%-30% higher than other controllers on the market. Its intelligent three-stage charging design effectively prevents the battery from overcharging, over-voltage and short circuit. It takes no power from the battery. You will clearly know the charging status of the battery through the two indicator lights on the controller ?Easy to Install Angle Adjustable?- Equipped with a 360 degree angle adjustable mounting bracket. Helps solar panels always have the best angle to face the sun. It?s very easy to install this bracket on the solar panel with pre-drilled mounting holes and needed screws. All cable connections are plug and play ?What You Get? 1 solar panel + 1 charger controller + 1 mounting bracket +1 alligator clips +1 O-rings + 1 set of mounting pieces.