Review on High-Efficiency 12V Monocrystalline Solar Panel by Newpowa - 5W PV Module for Battery Maintenance and Trickle Charging in RVs, Marine Boats, and Off-Grid Systems by Treyshaun Clena

Please note that the maximum no-load output voltage of this panel is only 17V. So if you want to use it to charge with a 12v controller the panel needs full sun to work. My first panel mostly stayed in the shade so it was cheap enough to buy another one and put it in parallel somewhere sunnier, now my little solar charging system works great.