Used a few times to charge my sherpa from goal zero. Works pretty fast, it's amazing. Please note, solar panels do not hold a charge it produces power when it is exposed to sunlight. So if you don't have something plugged in, it's not going to power it or save power. You will need some sort of adapter from goal zero or generic brand to plug devices in. Like the goal zero input cable. $20.
What goal zero has to say:
100-Watt (14-22V) foldable and weatherproof solar panel.
Big wattage and weighs only 10 lbs. For chaining multiple Nomad 100 Solar Panels together, purchase a 4X 8mm Combiner to High Power Port Connector.