indeed it was duel pane, and DESIGNED for insulative value, not light transmission.
but that was all i could find. :-(
tests were done dead shorting, and testing for total amperage of 6x.5vx3A pannels.
calculations were done and values are the loss from the topping, VS the cells being totally exposed.
Light levels (sun) were enough to get 87-92% of total stated short ratings.
i can get a pane of glass but it will end up kinda wasting that money if its RELATIVE to the plastic.
IF the glass will lose say 5% and the plastic 8% then i am ok with that loss.
but IF glass that i can purchace locally for fair prices would have only 1-2% loss then i might think about using glass instead.
i know that the plastic will yellow, become brittle (as glass) , and scarred, and wasted, but the design is such that it can be removed , tossed out, and replaced.
the IDEA is if the glass breaks then i am going to be getting 0%, because these cells will be another 500 piece puzzel.
i forgot to add one. A very THIN piece of heat shrink clear plastic had Major loss at 25-30%, designed for Packaging, it probably has UV protection in it??
i didnt get to test automotive waxes, the darn wind was making solar Kites.