Sunnytech1pc 3W 12V 250ma Mini Small Solar Panel Module DIY Polysilicon Solar Epoxy Cell Charger B047

These are DIRT cheap 3W panels. I've gotten a handful of themn over the last year or so. Typically I hook up two in parallel to a USB buck converter for making a little phone/powerbank charger, and they work great for that. One panel is more than enough to power little microcontroller applications/low energy demand stuff. Lots of fun DIY projects to be had with this, I'm hoping Sunnytech makes more of this model available. (I just bought another 7, but there's only a few left in stock as of this writing).If you're reading this though, Sunnytech, you'd make me reeeeal happy if you made a single panel that was 12V 6W. Would definitely make 3D printed enclosures easier. :P

小型ながら、弱い太陽光でも結構発電する。

Needs a blocking diode.Works great at keeping my lawnmower battery charged. Looks cool on the mower also.

I was impressed that this unit could provide near stated voltage output under low sun conditions. I'm sure the current output was reduced, but still appears to be a solid product. Now . . hopefully it is durable.

3 watts MAYBE for the first few days. After that, maybe 1 watt. Unable to supply even 100ma in full sun. Ask it for the supposed 250ma that the 3 watt spec suggests and it chokes and will drop to 6 or 7 volts. These are a complete joke. If you are unable to test yours and you are having unexpected issues with the product you have used this for then it's probably this waste of resources.