【Ultra-Smart MPPT Technology】This 12v solar panel kit is crafted with SUNER POWER's innovative Ultra-Smart MPPT technology, allows to deliver high tracking efficiency of up to 99% and peak conversion efficiency of 98%, improving approximately 20%-30% utilization rate than other competitors. 【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. 【 Full Safety Protections 】Built-in multiple protections including over-charge, over-discharge, over-voltage, over-current, over-load, short circuit, reverse polarity, and over-temperature, waterproof and spark-proof, the battery is fully protected. 【 Three Battery Modes 】Independently charge and control each 12 volt battery with selectable charging modes among 12V, 12V AGM and 12V Lithium - for all types of lead-acid boat, car, dump trailer, automotive, marine, RV, powersport, camper and deep cycle batteries, including flooded, gel, AGM, SLA, VRLA and maintenance-free, plus lifepo4 lithium batteries. 【 Visual Charging Status】The digital charge controller allows to visually monitor charging status of PV charge current, battery voltage and state-of-charge among 25%-50%-75%-100%. It's not just a solar battery trickle charger, it's an advanced solar battery charger maintainer.