Mono cells haven't been affordable for more than about 8 years. In the 90s it was 8% poly cells in anything affordable. Now you can get 22-24% glassless cells f

Mono cells haven't been affordable for more than about 8 years. In the 90s it was 8% poly cells in anything affordable. Now you can get 22-24% glassless cells for a dollar or two per watt retail (or much less in bulk). Much work is being done to commercialise hybrid tandem cells with growing confidence they'll be here this decade. You could similarly say "polyjunction cells have been about 32% in the lab since the 90s" once they are dominant. Similarly boosting coverage ratios from the 70% of painted area or so of the current three concepts to 95% is possible now but not economic. As are thin film 10% efficient transparent cells in lieu of tinting over the side and rear windows. A 40% improvement in car efficiency (the sion is heavy and boxy so there's room), with a 40% improvement in coverage and a 30% improvement in panel efficiency (or 50% in poor weather where it matters) would take it from 'okay, I guess that kinda maybe works sometimes' to 'when was the last time I plugged it in outside of a road trip?'