Sunnytech 1pc 3W 12V 250ma Mini Small Solar Panel Module DIY Polysilicon Solar Epoxy Cell Charger B047

Works perfect to power a 12v fan for the black waste vent on my camper during the hot summer months.

No issues so far. I'm using this with a charging circuit for a 18650 battery for a data collecting application. It's doing the job, but even in full Florida sun, I'm not hitting the advertised output. There could be a host of reasons for this (including operator error). I've picked up cheaper panels from eBay with similar output, but was hoping that the slight premium meant higher output.

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

I get over 12V, but in November, all afternoon, I didn't get more than 180+mA. I may have to get another to make this work. But it is nice and thin, removable plastic covering, probably expoxy coating which means it will "fuzz over" over time, like older car headlights. I guess either replace 'em, or try to polish 'em back up.

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.

The solar panels work very well to generate power in low light situations, however, one of them that I ordered wasn't even working and it looked perfectly fine to me?!? There are no diagrams to how to use this, no datasheet, absolutely nothing...If it weren't for the guy who posted pictures I'd be clueless thinking I broke all my solar panels!!

Arrived promptly, well packaged to protect it and I look forward to using it in my project. I will definitely be looking for Sunnytech as I move forward with this and other projects. - Pete

小型ながら、弱い太陽光でも結構発電する。