FellDen Micro Solar Panels with Wire, 5PCS 5V 200mA Photovoltaic Solar Cells Kit 110mmx60mm / 4.33''x 2.36''

Work well. Sturdy and responsive. Using to charge super caps and it gets full voltage even in evening light. I didn't gauge it but they are strong enough to charge 40F of caps in about 30 min and I have 2 sitting in the shade in parallel. You will most likely need all 5 if you intend to run a constant MCU or quick charge a phone.

Purchased twice, work well for small DIY projects

I love these little panels. I have several $40 solar spot lights on the eaves of the house. The lights and switches last forever, but the solar panels are unpredictable. In the past, I had to buy a new solar spot light if the panel went south. Now, I just glue a couple of these little micro panels on the bad panel face, connect them in series, and re-wire from the bad panel to the micro panels. So $40 for a new spot versus $6 to extend the life of the old one. There's a slew of other uses I'm anxious to try out.

I hooked three of these in parallel and then directly to a tt-motor (gear head motor). Indoor lighting did not power the motor at all. I took the combined panel out on my deck and exposed it to sunlight (hazy smoke over cast from Canada wildfires). The motor sprang to life very quickly and with a very respectable RPM. So, my conclusion is these cells make about 2.7 to 3v on indoor lighting but at low current. In sunlight they work as advertised.

Well built for some small panels! Accurate output rating at full sun ! They even produce decent current under interior lighting ! Very impressive

Great value for a do it yourself small battery charger using the 5 V solar panel.

Been in use outside powering small Meshtastic nodes for over a year in all weather with zero issues!

These suck, they're only outputting 20 ma with no load