Smart MPPT Technology: This 12v solar battery charger comes with built-in protection system. The innovative MPPT technology allows to deliver high tracking efficiency of up to 99% and peak conversion efficiency of 98%, improve 20%-30% utilization rate Upgrade 3-stages Charging: The smart 3-Stages charging algorithm (Bulk, Absorption, Float) ensures charging safer and maintains 12 volt battery at a stable level for extending battery life and avoiding overcharge, no additional maintenance Easy To Monitor: The LED indicator allows to monitor the working status. The charging will be cut off when battery fully charged and resumed automatically when battery drained, easily judge if the solar battery charger is charging well Full Charging Protection: This 12 volt solar battery charger equipped with multiple protection includes over-charge/discharge, over-voltage, over-current, over-load, short circuit, reverse polarity, over-temperature, IP65 waterproof and spark-proof, fully protected Compatible with Multiple Batteries: Widely used as a solar trickle charger and advanced solar battery charger maintainer for multiple 12 V batteries including gel, Deep Cycle, SLA, Flooded, AGM, Seal-Lead Acid and LiFePO4 lithium battery Robust and Durable Material: Made of A+ mono solar cells with efficiency up to 21%-30%. Strong tempered glass+corrosion-resistant ABS frame, withstand extreme weather conditions like UV, hail, sandstorm, up to 2400 Pa wind pressure and 5400 Pa snow load Easy to Install and Use: The outdoor solar battery maintainer comes with pre-designed holes on solar panel frame which allows for quick installation. Note: all cables are plug and play, just simply connect it to required device Wide Range of Applications: An automatic and smart solar battery tender, a variety of scenarios for car, boat, RV, dump trailer, marine, camper, lawnmower, motorcycle, jet ski, tractors, trucks, ATV, trolling motor, etc

20 Watt 12 Volt Waterproof Solar Trickle Battery Charger & Maintainer

• High efficiency poly crystalline solar cells, works great in all days.
• LED work statue indicator, battery power indicator, error warning indicator, all statues are clear.
• IP 65 waterproof design to prevent components from oxidizing into water, no worry to place it outside in all seasons.
• Over charge protection, over discharge protection, reverse polarity protection and short circuit protection
• Durable ABS frame and tempered solar glass, well built for years usage.

Plug & Play SAE connector

Equipped with 3-piece connection cable kits, battery clamp, cigarette lighter and bare wire. 

Each of them is equipped with SAE connector, plug and play, easy & simply to connect and disconnect, no need to recognize positive or negative.

Note: As this is 20w solar panel main function is maintain battery, not for full charging your battery