High-Efficiency Charging ALLPOWERS SP002 portable solar panel delivers a peak power output of 21W, supported by a photoelectric conversion efficiency of 22-25%. This ensures consistent and efficient energy harvesting under real-world solar exposure. Ideal for camping or integration into an RV solar kit, the panel reliably charges the built-in 10000mAh lithium-polymer battery or powers devices directly through its triple-output interface. Under standardized laboratory lighting conditions of 70, Built-in Power Bank Unlike many solar chargers that cannot store energy, the SP002 features a integrated 10000mAh lithium-polymer battery, allowing you to store solar or grid-derived power for use anytime. This built-in battery can be charged via solar power or a wall adapter (Micro input supports up to 12V/1.5A with a QC 3.0 adapter for a full charge in about 3-4 hours), offering flexibility and convenience. This feature makes it not just a solar panel but a complete portable power solution,