Review on 🔋 WISSBLUE Solar Panel Charger 21W 60W: Fast, Dual USB 2.4A 4.2A Portable Charger for Travel, Camping, Emergency Backup - Compatible with iPhone, iPad, Samsung, Kindle, and More by Trevor Blazis

I tested the Ryno Tuff Slab and this for a trip to Wyoming. On June 20th, 2019, on a cloudy day, I brought the panels to the roof of Brooklyn. This panel was outputting 350mA (while the Ryno was outputting 500mA). On June 24, a hot and sunny day, around noon, this panel was delivering 1.9A or 9.5W when perfectly aligned. In the horizontal position, it was outputting 1.7A - again under ideal conditions. When hovering randomly on the same hot and sunny day, it still produced around 4-5 watts. Because Ryno Tuff produced significantly more power under the same conditions and cost about $10 less. I sent it back.