1) In a lot of countries the bulk of the relevant housing stock (i.e. pitched roof low-rise) is already built out and has a considerable outstanding economic lifetime. Therefore the newbuild market is quite a small fraction of the total residential on-roof market. We will (we must) go through the majority of the solar adoption curve during the next twenty years. We
must do that for climate change reasons, but we
will do that for economic reasons, and history also shows us that most of these S-curves are 20-year affairs (and so does the theoretical modelling). So Tesla cannot afford to hang around and take a seventy-year view on that. Besides which the worst customer to have is a property developer's buying team.
2) If you go look at pitched roof low-rise roofs around the world you'll rapidly come to appreciate that most of them don't look like US-style fake (or real) shingles. So going after a fake-shingle market that is only a small subset of the overall global roof style market is boxing oneself unnecessarily into a small corner. But the sheer complexity of trying to develop tile-sets to cater for all the global markets seems unlikely, especially as some have geometrical challenges that don't exist on fake shingles to anywhere near the same extent. (There were US/French/Swiss/etc experiments along these lines one or two decades ago : now I'm showing my age go look at the sheeting bonding/encapsulation experiements for single and triple junction by variously UniSolar and Flexcell back in history. There is a long line of "printed solar" experimentation which continues to this day, I noted recently that MIT are still going after it).
3) And in any case doing roof-integrated solar (BIPV) is an added complexity in terms of function-sharing that most home-owners have concluded that they would rather not have. The purpose of an external roof layer is to provide weather/sun protection; retain heat/cold; keep out varmints; and be a firebreak (it may also be a structural element in some roof types). Adding into this the functions of energy capture & transformation & delivery is - as the uptake data shows - a step too far. Hence the prevalence of above-roof modules on mounting bars and brackets. These days typically in the 400-700W range, i.e. the amount of field-install wiring and fixing is minimal and most of the system manufacture stages are conducted in a factory environment where economies of scale come into play; plus higher quality outcomes. (The one exception is carport-style roofs where there are very interesting solutions, but these always go down the module pathway, not the shingle pathway). Even where subsidy schemes and permitting constraints have hugely tilted the playing field towards roof-integrated the uptake results have been a fail (examples of these schemes/constraints are evident in various histories in UK, France, and some US permitting areas).
4) Then of course residential solar on low-rise pitched roofs is of course only a small subset of the overall solar market. There is residential solar that is ground mounted, i.e. no interest in shingles, will always go modules. Or they are flat roofs, again using modules on stands, and again no interest in shingle-style. But even if all residential installs were to be amenable to shingle style, they would still only be a fraction of the overall global solar market which is dominated by utility scale and commercial/industrial scale. The residential market is only 28% of the overall on an annual basis, or 16% on a cumulative basis.
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So if you add all this together the maximum accessible market for a shingle-style tile is only a very small fraction of the overall market; and that fraction is still a minority even in the countries where the demand is primarily located.
(BIPV may have more traction in the commercial space as curtain walls, often semi-transparent, but they will be modules rather than shingles. Architects love doing these curtain walls and they do make better sense in that context.)
(Someone was asking about the significance of the Chinese shingles. I think they are manufactured almost exclusively for the export market, not the Chinese market. Furthermore my personal opinion is that the technology is more likely to find application in sheet roofing form if it ever becomes competitive, rather than shingle form. ?? Maybe in twenty years time, i.e. after we have done the heavy lift in S-curve terms ?? I was sure I had posted a news item recently re China shingle progress but I can't find it - so if anyone wants to dig further try this for starters :
Solar Roof tiles Continue to make slow, steady progress )
- all imho of course
A white paper of this nature is fair and square in the middle of marketing, indeed it is practically advertising, obviously aimed at installers but also aimed at the Federal level. To be honest at this point I think almost the only people who buy Tesla solar in the residential segment are the equivalent of the Mercedes/BMW/Audi buyers. We know (i.e. have very good reasons for believing) that Tesla has been throttling growth of residential solar sales because it was loss-making (i.e. very poor performance), with storage being what was assisting the Tesla Energy division towards profitability. Meanwhile global residential solar sales have been very profitably roaring ahead, and Tesla's repeated headbutting of a dead-end path is quite obvious in the data.
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That 0.5% of the residential market is of course 0.1% of the total market.
I sincerely hope that folk will look a little bit more carefully at Tesla Energy in the future
and demand better quality data be consistently provided in the quarterllies on a level playing field basis for all investors, at a meaningful level of breakdown, so that we may form rational views as to what is going on.
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Meanwhile back on the auto side, the really good news is that these significant price moves have come in early enough in January as to make it easier to incorporate the effects in all our many & varied spreadsheets. Analysts and forecasters of the world, celebrate.