Review on AOSHIKE Polycrystalline Silicon Photovoltaic Charger by Troy Henkhaus

Just note that these are mostly leftovers from the manufacture of large cells. The areas to be soldered on the positive side are quite small, sometimes as little as 3mm x 3mm, which is fine as they are too thin to really need a solid solder joint. The anode has a large soldering area, but still doesn't run the full width of the board (as in the product image). In general, they are great for hobbies and play. done just as well as in the photo and they have small burn marks.