The Anker Advantage: Join the 10 million+ powered by our leading technology. Fast Charging Technology: PowerIQ delivers the fastest possible charging speed up to 2.4 amps per port or 3 amps overall under direct sunlight. 21 watt SunPower solar array is 21.5-23.5% efficient, providing enough power to charge two devices simultaneously. Incredibly Durable: Industrial-strength PET polymer faced solar panels sewn into a rugged polyester canvas offer weather-resistant outdoor durability.