Solar regulator charge controller with LCD display for easy monitoring and control of charging and discharging. Designed for use with photovoltaic panels only. Please install on a flat, ventilated surface. Key benefits Clear LCD display for straightforward monitoring and setting of charge and discharge parameters. Automatic 12V and 24V battery identification simplifies installation and prevents wiring mistakes. Selectable battery modes: b1 for charging battery with automatic 12V or 24V detection, b2 for lithium ion battery, and b3 for lithium iron phosphate battery. Dual USB ports provide convenient charging for small electronics directly from the solar system or solar generator. Designed to help improve conversion efficiency between the solar panel and the battery, increasing overall system effectiveness. Compact controller suitable for small to medium off grid solar setups and portable solar generators. Important functions and compatibility Function: solar panel controller that regulates charge and discharge, protects the battery from overcharge and deep discharge via configurable settings shown on the LCD. Compatibility: only for use with photovoltaic panels; supports 12V and 24V battery systems by automatic identification; compatible with standard lead acid style batteries in b1 mode, lithium ion in b2 mode, and lithium iron phosphate in b3 mode. Additional use: can be integrated into a solar generator system to provide regulated charging and to supply USB power for devices. Installation and placement Install on a flat, ventilated surface to ensure proper heat dissipation and reliable operation. Follow standard wiring practices for photovoltaic panels, battery, and load connections. Ensure correct selection of battery mode before regular operation. Practical use scenarios Off grid cabin lighting and battery storage: connect a photovoltaic panel, set the controller to the correct battery mode, and use the LCD to monitor charge status and output to lights and small loads. RV and camping power management: pair with a portable solar panel and a 12V battery or solar generator to charge batteries, run 12V appliances, and charge phones via the dual USB ports. Emergency backup and portable power: integrate into a small solar generator to regulate battery charging, keep the battery protected, and provide USB power for essential devices during outages. What makes it stand out User friendly LCD for quick setup and live system information. Automatic 12V and 24V detection plus explicit battery mode options b1, b2, and b3 for common battery chemistries. Dual USB outputs add convenience for charging mobile devices without additional adapters. Designed specifically for photovoltaic panels to deliver reliable charge regulation for small solar and portable generator applications. Note Only use with photovoltaic panels. Install on a flat and ventilated surface. Select the correct battery mode before regular operation.