For many homes in the U.S. right now a 506 square foot array on one’s roof can supply something on the order, roughly 22 by 23 feet square would allow 10.4kWp and (IF) this tandem cell structure off of a manufacturing line would allow 30% efficiency, that same array would become 14.2kWp, (IF) this tandem cell product off of a manufacturing line was 40% efficient, then one could have an array of 18.9KWp, a substantial leap in home and small business generation capability on any given day, sunny or cloudy. The burning question is what is the LETID and PID from the first year of use and the degradation each year of use after that.

I understand from this site, the DOE has had grants for such tandem cell development and American company First Solar has been in the hunt for superior tandem cell manufacturing at the Ohio plants, (perhaps) by 2028? This First Solar/Evolar technology ‘stack’ might just get to the point of thin film tandem solar cells at 30% plus sooner than later. First Solar is poised with its previous purchase of company TetraSun TopCon cell manufacturing (IP). I wholly look forward to that day.

The future’s so bright, ya’ gotta wear shades.