Sunnytech 1pc 2w 6v 330ma Mini Solar Panel Module DIY Polysilicon Solar Epoxy Cell Charger B031

I am using these to charge lithium batteries to run outdoor lighting -- seasonal (Christmas lights far from the house), and to light our driveway. They work quite well and have no problems with weather, including being burred in snow :-).But watch soldering the connectors to the board (heat the pads no more than absolutely required for the solder) and use stress relief on the wires once attached. The solder pads look big, but are not strong. Once attached and with the wires fixed so that they do not pull on the board -- no problems at all.

I wired two of these in series to power a small audio amp. They work well, especially since the amp is pretty forgiving. It functions at any voltage between 9 and 24 volts. So no charge controller needed.Open circuit current is about 300 mA. But all solar cells are sensitive to heat, and as they heat up, current drops considerably.These panels can power the amp at medium volume levels with direct sunlight. I wired them to a set of Li-Ion batteries with a diode to prevent backfeed. When I test in direct sunlight on a hot day, about 170 mA of current is available for the amp and batteries.These panels won't power a significant load. But they can power a small audio amp with about 2 Watts. As a bonus, they charge the batteries a little and prolong battery life.This was a fun, worthwhile project.-Chris

I was thinking that will not work but I used daily on my feeder at hunting ranch and works good recommend for the price I use to buy same 6v for 30 dllrs at academy

I bought and tested 2 of these in direct June sunlight close to peak hours (in America), and got a short-circuit current of about 185 mA with open-circuit voltage around 6.9 Volts for the first one, which comes out to 1.28 Watts. The second panel had V = 6.56 V and i = 280 mA which comes out to 1.84 Watts. So both were pretty far off from the stated voltage and current values, and both fell short of the 2 Watt stated power output in my testing.They work but their output will probably be a fair bit off the stated values. Understandable for the price. They're still okay for experimenting and little projects where the values don't have to be exact.

I’m giving this 5/5 based on its value for the price. I tested it and it performs just as good or better than my expectations and will work great for my weather station.I have not yet tested it’s durability, but that may come down to how I mount the panel. I’ll probably put it in a sealed gram to be safe.Perfect little panel!