Review on 🌞 Renogy Portable E.Flex Monocrystalline 5W Plus Solar Panel: Efficient Charging on the Go for Hiking and Biking with USB Port by Kimberly Evans

I was skeptical at first, but on a clear November morning in Northern California, it charged my Galaxy S4 Mini from 38% to 100% in two hours! I put some foil on the floor in front of the unit to capture the reflection. I weighed this device in for you backpackers at 6 ounces. It's worth it. Other 20+ watt panels weigh 16+ ounces. Update: I later bought a "10 watt" version of this, which is essentially two panels connected together. not twice the load, but twice the weight. I have confirmed that the target accepts more than the maximum, so the panel is the limiting factor. This is Northern California. If you put foil under the plate as a mirror, you will get an extra 0.10 A - it's worth it! I'm picky as I will be using them for hiking. The length to weight ratio is crucial and every gram counts. I will most likely take a 5 watt panel.