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  • Lightweight Solar Panel (12V Battery Charger)

    Good guestions. I think I used 2 layers of 4oz E-glass cloth from my local goindustrial store for the panel, then 1 layer of 2.5oz cloth to cover the PV cells. I'm not 100% sure.I'm not sure about the light absorbtion. There is about a 200% variation in open-voltage output of the cells I bought, so to get a good answer I'd have to carefully characterize a particular cell then measure it again after encapsulation. I did some crude measurements like that but forget the answer, beyond "it worked". The potting resin is completely transparent to visible light, and I don't think that well-wetted glass absorbs much light. I'd assume it would be at least as good as the epoxy some commercial panel manufacturers use. Years ago I made a motorcycle headlight lens with glass mat, which was...see more »Good guestions. I think I used 2 layers of 4oz E-glass cloth from my local goindustrial store for the panel, then 1 layer of 2.5oz cloth to cover the PV cells. I'm not 100% sure.I'm not sure about the light absorbtion. There is about a 200% variation in open-voltage output of the cells I bought, so to get a good answer I'd have to carefully characterize a particular cell then measure it again after encapsulation. I did some crude measurements like that but forget the answer, beyond "it worked". The potting resin is completely transparent to visible light, and I don't think that well-wetted glass absorbs much light. I'd assume it would be at least as good as the epoxy some commercial panel manufacturers use. Years ago I made a motorcycle headlight lens with glass mat, which was good enough not to get me pulled over, and the thinner cloth is better than that.

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