DX26 PWM Solar Charge Controller 10A 20A 30A, auto 12V/24V system voltage recognition, compatible with lead-acid, ternary lithium and LiFePO4 batteries. Ideal for off-grid home solar power system, solar street light, RV, cabin and small photovoltaic energy storage. Equipped with industrial main control chip and large LCD screen, full 3-stage PWM charging management with adjustable charge/discharge parameters. Adopts dual MOS anti-backflow circuit for ultra-low heat generation, built-in self-recovering multi-protection: overcurrent, short circuit, open circuit, reverse polarity, PV overvoltage, over-temperature, low battery voltage, with clear error indicator light warning. 3 load control modes available: light control only, light control + time delay, always-on manual switch mode. Built-in max 2A USB port for charging mobile phones & digital devices, compact size, easy wiring, cost-effective solar battery voltage regulator for small off-grid PV systems.