40A PWM Solar Charge Controller 12V 24V Auto with LCD Display and Dual USB 5V Output Overview A reliable 40A solar charge controller that automatically selects 12V or 24V systems, regulates solar panel input using PWM charging, and provides an LCD display for system monitoring. Two 5V USB outputs allow direct charging of phones, tablets, and small electronics. Key benefits Keeps battery charging controlled and predictable by applying PWM regulation between solar panels and battery. Automatic 12V and 24V detection simplifies installation and reduces setup errors. Dual 5V USB outputs enable convenient device charging without additional adapters. 40A continuous current rating supports mid sized solar arrays and battery banks. LCD display provides visible system status and basic settings for quick checks and adjustments. Main features and specifications Rated charging current: 40A System voltage: automatic 12V or 24V selection Charging method: PWM pulse width modulation Display: LCD for system status and parameter viewing USB outputs: two 5V ports for charging mobile devices Primary function: regulate solar panel input to charge battery and provide USB power Designed for straightforward mounting and wiring in small off grid systems Performance and compatibility Compatible with solar panel arrays and 12V or 24V lead battery systems commonly used in off grid applications 40A capacity supports typical residential and recreational installations where reliable battery charging is required PWM charging offers stable voltage control suitable for common battery types used in small solar setups Practical use scenarios RV and camper installs where the controller charges the house battery from rooftop panels and provides USB power for phones and tablets while parked or traveling Small cabin or shed powering LED lighting and battery backed sensors where the LCD display helps monitor battery state and solar input Marine or boat systems that require controlled charging of a 12V or 24V service battery and convenient USB ports for navigation devices and mobile charging Installation and user notes Auto voltage detection reduces configuration steps during installation. Follow standard wiring sequence for solar panel, battery, and load connections where applicable. Use the LCD to review charging status and make basic adjustments according to battery and system needs. Select wiring and fusing appropriate for a 40A continuous rating to ensure safe operation. Why choose this controller This unit provides a practical combination of a current 40A rating, automatic 12V and 24V selection, PWM regulation, and built in USB charging and LCD monitoring. It is suited for small to mid sized off grid solar installations that need dependable battery charging and simple device charging in a compact package.