Are these windows only for producing energy or do they also function as a Low-E window? If yes, how does the coating compare to conventional coatings regarding transparency and thermal insulation/solar control?

Yes, our windows function as traditional Low-E windows while also producing energy like conventional solar panels. Our coating today is similar to double and triple silver coated low-E coatings that have emissivity of only a few percent and solar factor/solar heat gain coefficient as low as 0.25, while simultaneously achieving power conversion efficiencies as high as 10%. Our windows match the transparency performance of most commercial windows today.