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Solar Roof

tesla.com

431–440 of 455 posts

Re: Solar Roof

#431

I'm so absolutely excited for solar power. Tesla's Solar Roof, their PowerWall batteries, electric cars. It's all just painting such a bright future. Certainly Tesla has no monopoly on it, but they've made it sexy and are pushing the bleeding edge forward. Props to them. We recently signed a contract to do an installation on our house (with a local contractor, not SolarCity). It can't happen soon enough! We'll have e…

There are still a lot of places where the cost/efficiency of natural gas makes more sense.

Water heaters, stoves/ranges, etc.

Re: Solar Roof

#432
post #185

Earlier quoted context omitted.

> Switching from gas to electricity for heating is a bad idea if there's still coal power stations in use You misunderstand. Our solar installation will be expanded to cover the appliances. We'll be 100% off-grid. > Going off grid means you need a lot more batteries We only need 3 PowerWalls to cover all our needs (~1 for our needs now, 3 for when we have electric appliances and a car). That's not "a lot more". > Sha…

Sharing power via net metering is better (for the environment) because there's no conversion loss from charging a battery.

Until the power companies start devaluing your power because there's a surplus of solar on your street and they don't need it.

Re: Solar Roof

#433
post #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.

This is a very good point, unless they're assuming they're as easy to break as tile; which I think is a bad assumption considering the plastics/glue used in solar panels; When they break they barely shatter and most stand up to intense hail storms just fine.

Re: Solar Roof

#434

Does anyone know how the electrical connection works? It seems to me that this is critical. If connections fail in a really hostile environment (high thermal range and moisture levels) then maintenance will kill any savings. But if they've solved this problem, (and perhaps have an efficient way to replace tiles without removing the ones above ), then I'd guess they will be wildly successful. I once visited my brother…

If all are assumed to be powered, then I think an assumed failure rate is acceptable to the warranty.

Are they going to have an interface that "reports" bad shingles on your roof? Hell no!

But if you're roof is generating whatever the acceptable range is for the area, then you're good.

Re: Solar Roof

#435
post #304

At my house, it would take more then 20 years to use up $53,500 worth of electricity assuming that the panels would be able to generate all the electricity that I need (and it probably would not be able to because my roof is not in the perfect angle). I probably will have to stick to a conventional roof.

Good news! Conventional roofs are 100% compatible with conventional solar panels.

Re: Solar Roof

#437

Apart from people buying these for status there is another market - Hawaii and other remote places where prices are from 2x to 5x comparing to California.

Interesting it to be considered a status symbol; 90% of people walking by will think it's just a normal roof.

I can spend pennies for that (comparatively).

Now, if I had an array of panels on my normal roof; at least >90% of people would know what they is and be "impressed". However impressed people get about roofs, that is.

Re: Solar Roof

#438
post #55
post #40

Earlier quoted context omitted.

> Tesla's calculator estimates $40,500 for a roof that generates half our power needs, and should provide $20,400 worth of energy over 30-years. This depends quite strongly on where you are. Your numbers are very close to the ones I get if I use my correct address, which is in the Puget Sound area of Washington State. If I keep everything the same except the address, changing that to one in Merced, California, then i…

They are using Google's Project Sunroof[1] to do the modeling. The tool uses satellite images of your roof to create the estimates, and accounts for orientation, shading from trees, etc... [1] https://www.google.com/get/sunroof

What makes you think that? I'm a little skeptical because Sunroof doesn't cover my address, but I have no problem getting an estimate.

Re: Solar Roof

#439
post #426

Earlier quoted context omitted.

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…

I readily admit I am not a policy wonk (though I follow environmental issues more closely than most).

I am aware of green home initiatives at various levels of government (I've owned a home in the past, and have taken advantage of some of those). Again, I'm not opposed to the subsidies and tax credits that incentivize power reduction.

> 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.

We're not talking about a $50 rebate. This is a tax credit worth several thousand dollars, for an upgrade that increases the value of a home by a notable amount, for a home that will probably still consume more power than a poor family's apartment.

My concerns about this are:

1. We are past the point of inevitable crisis in terms of climate change; we really can't do enough at this point to stave off significant human health, ecological, and economic impact. Even if we, as a nation, started making significant changes today (which we are politically farther away from than we've been in decades), we'd still face serious problems.

2. There are households that consume multiples of what poor families consume...and they're being rewarded with heavily discounted amazing new home upgrades because of it, increasing their wealth and decreasing tax revenue. Yes, it has a positive environmental result, and it may be worth it, but are there ways we can reward lower power users, too. Many municipalities have tiered power prices; e.g. .11/kWh for the first 500, .12/kWh for the next 1000, etc. Maybe that needs to be more aggressive. Directly addressing usage can incentivize a wide variety of changes, and discourage McMansions (which are disastrous from a wide variety of angles). Egregious energy consumers are externalizing their environmental impact. (This is even more true on a commercial and industrial level but that's another discussion entirely.)

3. Poor folks often can't get any of the stuff you're talking about (e.g. subsidies for insulation), because they rent. So, they are at the mercy of their landlord for how efficient their home is (and that's a potential problem with tiered pricing; there obviously needs to be incentives for landlords to increase efficiency and disincentives for owning inefficient properties, too).

I think you're taking my talking about the issues as being Policy Pronouncements, and that those pronouncements can be simplified into "Take money from rich people and give it to poor people".

It isn't (and I tried to make that clear in each of my rants on the subject). I am not saying, "These subsidies should not exist, and we should give money to the poor." I am saying, "Poor people are getting fucked daily, often to improve the position of wealthy people and in the name of something inarguably good, like 'protecting the environment'; how about we start trying to figure out how to fix that?" Add up the thousands of tiny ways wealth inequality is enabled in the US, often in the name of good things (like making neighborhoods safer, improving the environment, reducing drug use, etc.), and we end up with the low churn of wealth, and increasing chasm between the classes, that we currently see.

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