Solar controller designed for fast, simple, and flexible charging with photovoltaic panels and battery packs. Key benefits Faster device charging: Dual USB ports and a USB Type C port support fast charging protocols to reduce charging time for smartphones and power banks. Simple installation: DC5521 interface plugs directly into the controller, removing complex wiring and speeding setup. Wide battery compatibility: Supports 12V and 24V lithium ion battery packs and LFP battery packs. The controller can automatically recognize battery voltage or be manually adjusted as needed. Direct solar operation: Can be driven directly by photovoltaic panels, with multiple charging ports so no additional power supply or adapters are required. Designed to improve energy conversion from solar panels. Main functions and attributes Charging ports: Dual USB plus USB Type C for simultaneous device charging and power bank up. Interface: DC5521 direct connection to reduce installation steps and wiring errors. Battery support: Automatic recognition of 12V and 24V systems; manual selection available for specific setups. Compatible with lithium ion and LFP battery chemistries. Photovoltaic drive: Accepts direct input from solar panels to power devices and charge batteries without external adapters. Performance focus: Supports fast charge protocols and aims to increase charging efficiency when used with PV input. Practical applications Outdoor and camping: Power smartphones, cameras, and power banks directly from a solar panel during day trips and multi day camps. Vehicle and RV use: Integrate with a 12V or 24V battery pack to charge devices and maintain auxiliary battery levels while parked or traveling. Emergency and off grid backup: Use with solar panels to recharge essential devices and maintain battery packs during power outages or at remote locations. Compatibility reminder Works with 12V and 24V lithium ion battery packs and LFP battery packs. Battery voltage can be auto detected or set manually. Connect photovoltaic panels directly and use the built in USB and USB Type C ports for device charging. This controller provides straightforward solar to device charging with fast charge support and direct PV input to simplify off grid and mobile power setups.