UPGRADED SOLAR CONTROLLERThis solar charge controller helps you automatically manage the operation of solar panels and batteries in solar systems with the built-in industrial microcontroller. You don't need to reset it when the battery is exhausted because it will memorize various user-defined parameters WIDE COMPATIBILITY BY AUTOMATIC ADAPTATIONCompatible with 12V and 24V systems (automatic adaptation, depends on your system voltage, no manual adjustment required). A small amplitude voltage deviation is normal. You can also charge your mobile phone, tablet and PC via the dual USB output 5V/2.5A (max) COMPATIBLE BATTERY TYPEThis solar controller is ONLY suitable for various lead-acid batteries (including open, sealed, colloidal, etc.) Please DO NOT charge lithium batteries or nickel-metal hydride batteries, etc. The automatic battery voltage recognition function can protect the battery from misuse and better control the charging process. English: Note: When installing the controller for the first time, make sure the battery is fully charged to correctly recognize the battery type SAFE TO USEWith intelligent protection against overcurrent, short circuit, open circuit, reverse, low voltage and overload, which are all automatic recovery types, will not damage the controller. It also has dual MOS anti-reverse circuit and low heat. This 30A solar charge controller will help you improve system efficiency and extend battery life. But always note to install the controller on a flat and well-ventilated surface LCD DISPLAYLet you know the working status and data with the LCD display. The controller is equipped with charging time control and manual setting function, so you can switch modes and set parameters conveniently. A good choice for home, industrial, commercial, etc. use. Refer to the instruction manual for specific parameter settings and setting methods HOW TO CONNECT THE SYSTEM?When installing, please install the battery first, then connect the solar panel. When disassembling, remove the solar panel first, then the battery. Please connect the devices as instructed in the instruction manual, otherwise the system may be damaged by improper use Sales Questions Q1: Why can't it display 13.2 volts? Solar panel voltage 18 volts, lead-acid battery 12 volts (good battery), follow the instructions listed exactly, but it only displays 12.5 volts. A1: Please check the battery voltage. If the battery is fully charged, it will display 14.4 volts. Q2: When I plug in the solar panel, it doesn't display a charge. When I put a meter on the solar input of the controller, it shows the polarity is reversed. Could this be an error in the way the unit was connected internally? A2: Yes. In this case, please check whether the battery is correctly connected to the solar controller. Note: The data are all measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.