This is 20A MPPT Solar charge controller.It has three types of voltage,12V,24V,48V.

Package including:
1.1X MPPT 20A solar charge controller
2.1X USERS` Manual

Feature: The most outstanding feature of Maximum Power Point Tracking controller is intelligent tracking input voltage from solar panel, which could let solar panel always working at Maximum Power Point of V-A curve. Compared with normal solar charge controller, this MPPT controller could increase 10%-30% electrical power using efficiency from solar panel.

Function:
MPPT 20A solar charge controller regulator is not only have above mentioned special function, at the same time including completely Protecting and Controlling functions: Overcharge protectionOver-discharge protectionBattery Reverse Current ProtectionOverloading ProtectionShort Circuit ProtectionReverse Polarity Connection Protection
 

MPPT 20A(12/24/48V) Data Sheet