SUNYIMA5Pcs Polycrystalline Mini Solar Panels Solar Cells Solar System Kit 6V 180mA 133mm x 73mm/5.23"x 2.87" for DIY Electric Toy Materials Photovoltaic Cells Solar DIY System Kits

Product: "Sunyima, 133x73mm, 5 items". Vendor: Aoshike.Physical aspects: The product arrived in poly-foam protective wrap, inside a plastic bag. Overall dimensions are 7.1 x 13.2cm (2.8 x 5.2in, about the size of a smart phone). The light collection surface is 73.7 cm2 (6.2x11.9cm). Soldering is required: no wires are attached. The panels have no screw holes nor attached mounting mechanism (I created my own frame). One panel had a 1mm surface defect.Functionality: 5 of 5 were functional. Although the voltage and current (Voc and Isc, respectively [mean 3.49v and 38.6 mA]) produced under my test conditions (1750 LUX, placed 28cm from 100W incandescent bulb) were far below the rated "200mA and 5v" in full sun, I have no reason to doubt the rating. Another reviewer reported "183mA and 5v in direct sun". I found minimal variation in the voltage and current across panels.

Great buy all around

I've used solar panels minimally, so I wasn't sure how to really compare these. They put out anywhere from 2-6.5v in my testing, and even produce some power in cloudy weather, or indoors. They put out about 1w max, in full sun which for small projects is more than enough. I wired up 4 in parallel to power a raspberry pi with a temp/humidity sensor and placed it on my patio, and it's been working well. I need to figure out storage to a li-ion cell to store unused power for night time use.