TBER Waterproof 12W 12V Solar Battery Charger & Maintainer Pro, Built-in UltraSmart MPPT Charge Controller, 12 Volt Solar Panel Trickle Charging Kits for Car Automotive Boat Marine RV Trailer

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Innovative MPPT Built-in Controller: Maximizes charging efficiency with up to 99% conversion. This 12v solar panel battery charger is crafted with TBER's unique Ultra-smart MPPT technology, so all of its core parts, including its MPPT charge controller and solar panel are built using premium and durable materials.
Improved 3-stages Charging：The improved 3-Stages charging algorithm (Bulk, Absorption, Float) allows to charge 12-volt battery more effectively, ensures battery is safely recharged and increases battery life and performance.
Free Maintenance：The solar trickle charger stops charging when battery has full charge, and automatically resumes when battery has discharge, totally free maintenance. A fully-automatic, worry-free and smart 12volt solar charger.
Comprehensive Battery Protection: MPPT controllers include a float/maintenance stage to prevent overcharging, extending battery life and improving energy efficiency. Compatible with various 12V batteries, including gel, AGM, SLA, VRLA, and lithium-ion
Superior Quality and Material: Made with PC+ABS+Tempered glass, these solar panels withstand -40 to 137°C and are IP65 waterproof, enduring heavy rain, ABS+PC frames are stronger than flexible panels and won't damage car paint like aluminum frames
Very Comfortable to Use: Using the most advanced MPPT technology, this 12 volt solar battery charger starts charging immediately when it detects a battery. Pre-designed holes allow for quick mounting with included mounting screws, and all cables are plug and play, offering easy and quick using experience.