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Solar Roof

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421–430 of 455 posts

Re: Solar Roof

#421
post #337
post #125

Earlier quoted context omitted.

That's what baffles me about this whole thing. Unless your roof is rectangular with homogeneous shadows, if you connect the shingles, say, in rows, you'll have unbalanced voltages. Is the plan to have a microinverter per row of shingles?

There's two types of tiles. I suspect they just use the same number or row and then fill in any gaps with the non-solar tiles.

That makes sense. It also lets you avoid areas with shadows, by using the non-solar ones there.

Re: Solar Roof

#422
post #206

Earlier quoted context omitted.

This is tautological; the reason poor people don't get a lot of tax breaks is because they don't pay a lot of taxes. The government does spend a lot of money helping poor people, but not via tax credits.

It's not a tautology because tax credits aren't the only possibility for providing incentives. Imagine you worked for $10/hour, and somehow got put in charge of designing the incentives. Do you think they would look like this? I don't.

The tautology is in only looking at the subset of spending that's done through incentives, and then complaining that it disproportionately goes to people buying expensive stuff. That's what incentive means in this context: incentive to buy expensive stuff.

Anyway, you're coming at this all wrong. If I was in charge of designing this program, my mandate would not be to help poor people or rich people, it would be to increase solar power. How do you increase solar power? By paying for part of it. Who benefits? Whoever's buying it. Who pays to install solar power? Not poor people.

Re: Solar Roof

#423
post #206

Earlier quoted context omitted.

This is tautological; the reason poor people don't get a lot of tax breaks is because they don't pay a lot of taxes. The government does spend a lot of money helping poor people, but not via tax credits.

It's not a tautology because tax credits aren't the only possibility for providing incentives. Imagine you worked for $10/hour, and somehow got put in charge of designing the incentives. Do you think they would look like this? I don't.

Or here's another way to look at it: What's the whole point of having a solar power incentive? To get more solar power. Now suppose we changed the law governing solar power incentives to exclude rich people (or tall people, or right-handed people, or any group of people). What would happen? Less solar power.

That might be a desirable outcome, if you are more opposed to rich people getting tax breaks than you are to fossil fuels. But in that case, why not just raise taxes on rich people, and leave the solar incentive out of this?

Re: Solar Roof

#425
A bit late on this, but have to wonder what fire departments think about this roof/panel? How difficult will it be to vent a roof? Will the roof present an electrical risk to firemen (even assuming there is a cut off below)

Unfortunately, I don't think a lot of municipalities have given too much thought to widespread solar use and I wonder if this will fall afoul of possible future regs.

Re: Solar Roof

#426
post #206

Earlier quoted context omitted.

This is tautological; the reason poor people don't get a lot of tax breaks is because they don't pay a lot of taxes. The government does spend a lot of money helping poor people, but not via tax credits.

I'm speaking of incentivizing reducing power usage in the general case, not merely tax credits. The current solution is "let's give wealthy people more money to play with" (to questionable benefit to the general welfare). I should be clear I'm not saying I oppose tax credits for reducing usage; I'm just saying that poor people aren't getting the same kinds of benefits for using less power, even though they are using…

I applaud you for trying to think through this stuff, but minus all the ranting it sounds like what you're basically saying is that there are a bunch of ways we could be (but aren't) spending government money to reduce energy use while also helping poor people. How confident are you of this? Can you name a couple? For example, are you aware that most states already offer subsidies for buying more efficient appliances, and for installing attic and wall insulation, and for sealing heating ducts? (no citation, but I used to work at a non-profit that administers such programs) Characterizing the current policy as "let's give wealthy people more money to play with" is inaccurate, unless you think the people filling out the form to get a $50 rebate on attic insulation are doing so on a yacht.

Re: Solar Roof

#427
post #16

Earlier quoted context omitted.

I'm 21, thus I have no idea what roofs normally cost. I assume they're very very heavily below ~80k? For a "regular" house, what would a roof cost? 4k? 10k? 500?

My roof is 1600 sq ft. It had a metal roof on it, which is considered more expensive than asphalt. It was 40 years old, which is the how long metal roofs are expected to last. I replaced it myself for around $2000. Most of the cost was $1600 for the metal roof. Then there was $400 in special nails and trim parts and sealer. It would have cost a little more if it wasn't metal before since I'd have to have added the sp…

+1 for adding in the cost to support the extra weight.

Many homes, even ones they're building now, are not designed to support anything more than a few layers of standard asphalt shingles.

BTW, it's ridiculous that we're talking "down" to asphalt shingles now because of this. Some of those come with 50+-year warranties now...

Re: Solar Roof

#428

In modeling whether this makes sense, I looked at my annual electricity bill, which comes in at about $1,800/year. That's not enough savings opportunity to justify a ~$70,000 roof+batteries. However, when I add 2 electric cars, the savings nearly triple [0]. Instead of buying gasoline, I'll be paying for electricity. At $5,400/year, spending $70,000 starts to make some sense. On the other hand, if I put up ugly panel…

Keep in mind, a battery array isn't something patented by Tesla, you could easily (safety in mind!) create a "powerwall" yourself; or use someone else's.

Re: Solar Roof

#429
post #338
post #295

Earlier quoted context omitted.

Does that include the increased risks of nuclear war, new disease vectors etc? Because, while the probable outcome is relatively little impact the butterfly effect means you can get some less predictable results indirectly. Aka migration causes war X which due to _ spiraled into WWIII. Granted the world without global warming could alos end randomly as well so you can just say unknown unknowns are always a risk even…

increased risks of nuclear war you do realize that initiating nuclear war is suicide, right? the u.s. took advantage of the only chance of actually using one because they were the only nuclear power at the time.

Accidents happen, but a nuclear exchange between India and Pakistan seems vastly more likely during a war than outside of one.

Re: Solar Roof

#430

I think Elon got ripped off on his last shingle roof. The bar chart is nice but off by at least 150%. I've had many roofing subcontractors as clients past and present in Northern California. Based on an average of 870 roofs in 2016 for Single Family Residential homes in the bay area, Asphalt shingle roofs are $3.12 per square foot for materials and labor. The highest was $5.75 psf and the lowest $2.35 psf. Note that…

The roof launch event was very clear that this is a product that competes against premium roofs. Asphalt shingle roofs aren't premium roofs. As an example, for high-end housing developments, many of them do not allow asphalt shingle roofs. If that's not your thing, great. Then this isn't the product for you.

Yet they'll allow those shitty* cedar roofs that look like crap in 20 years...

*Shitty in how they look, not how they perform.

I can drive through a 600k+ neighborhood (5x-6x higher than the average house in my metro) and see this terrible looking shingle. I honestly feel bad for Mr. Jones who can't afford a new cedar (or fake cedar) roof because the option of a nice asphalt isn't allowed in his HOA.

https://aos.iacpublishinglabs.com/question/aq/1400px-788px/s...

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