There are also frame less modules out on the market which means essentially no aluminum needed. I'm only going to cite one example and that is the Lumos LSX system.
In its spec sheets the overall weight of a 280 to 290 watt panel is 62 pounds. Glass is on both sides of the panel so I'm going to guess that at least 50 of those pounds are glass. So let's call it 23 kilos.
Using Oilpan's energy usage numbers for flat glass of 5kwh per kilo that gives 115 kwh for a 280 to 290 watt panel not including the energy cost of the cells themselves. So that's an energy cost saving of 300 - 115 kwh or 185 kwh per panel. Seems pretty substantial.
Here's a link to the spec sheet.
https://lumossolar.com/wp-content/up...et-6252018.pdf
Here are a few other thoughts on newer types of panels.
https://news.energysage.com/new-sola...2018/#comments
JJ