1. The unit is tile. The roof is made of many tiles. You can have normal ones for the shaded areas of your roof. Also you can just do partial Solar Roof if you think having the entire roof generating electricity is an overkill.The idea of solar roof seems a bit weird to me. There are only certain portions of the roof that get optimal sunlight, like the south side. The back side of my home is always under shade of some trees, but front is OK. So, why would anyone make the entire roof solar?
Secondly, how long will these last? Tile roofs typically last 50-100 years, concrete tiles 50 years, shingles 20 years. If the cost is compared to tile roof, will they also last as long as tile roofs?
Thirdly, the repairability. A tile breaks, any roofer can come replace it easily. I have done some myself. Wonder how that works here. So workers should be able to walk on these. Was walking on the panels demonstrated?
The fourth problem is, if this is as efficient as regular panels, that means massive oversizing. Only 10% (or less) of my roof has solar, and that is good enough for my electricity needs. If I will over produce, I wlil have to sell the excess at 4c/kwh to PG&E. Any additional cost of the roof won't make sense at such low payouts.
2. It was demonstrated the Solar Roof can withstand more impact than other traditional roof materials.
3. Repair, not sure. But given 2, it might not even be something to worry about.