Atem Power 20A MPPT Solar Charge Controller Solar Panel Battery Regulator Futuristic Smart Home with Solar Panels System on Rooftop of Renewable. Atem Power 20A MPPT Solar Charge Controller Solar Panel Battery Regulator Features Lithium Battery Activation: Switch on the ''lithium mode'' and connect your battery and solar panel. It will work its magic and the battery will spring back to life. Highly Efficient: It ensures that every drop of power is rinsed out of your panel and features conversion efficiency of <= 98%, higher than 75% of PWM. Accurate Tracking: With up to 99% tracking efficiency, this MPPT solar controller ensures maximum power point solar charging even in cloudy environment. 12V 24V Automatic Detection: It is equipped with an automatic system for voltage recognition and can automatically identify system voltage once connected. Intelligent Protection: It comes with complete protections: reverse polarity, overcurrent, over temperature, undervoltage, overvoltage and short circuits. Genuine 3 stage Charging: This MPPT solar controller MPPT solar regulator undergoes boost, absorption and float stages for a more efficient energy flow. USB Outlet & Screw Terminals: Screw terminals make it easy to build into a new setup, and type A & type C outlets provide quick charge capability. User Friendly Interface: It has multiple LED indicators for displaying system operation information and a button for selecting the corresponding battery type. Multi Chemistry: This MPPT solar charge controller MPPT solar regulator is compatible with 12V or 24V lead acid, AGM, Gel, calcium and LiFePO4 batteries. Built TOUGH: Strengthened ABS housing is impact and shock resistant, and aluminum alloy chassis with integrated heat sinks greatly facilitates heat dissipation. Package: 1 x ATEM POWER 20A MPPT Controller 1 x User Manual