Hang 10... or as they now say...hit the lip!

2nd Light Forums
Decrease font size
Increase font size
Topic Title: Tesla releases details of its solar roof tiles:
Topic Summary:
Created On: 05/10/2017 03:46 PM
Status: Post and Reply
Linear : Threading : Single : Branch
Topic Tools Topic Tools
View topic in raw text format. Print this topic.
 05/10/2017 03:46 PM
User is offline View Users Profile Print this message


WG

Posts: 32570
Joined: 03/10/2005

 05/10/2017 07:14 PM
User is online View Users Profile Print this message


miker

Posts: 4533
Joined: 04/05/2010

So 21 sqft .....not sure how that is cheaper before energy savings.
 05/11/2017 04:38 AM
User is offline View Users Profile Print this message


somebodyelse

Posts: 5648
Joined: 06/29/2006

I didn't see anything about energy efficiency?

typical solar power is around 25% conversion...

It doesn't say what the conversion of these are.

IF new solar technologies come out that beat the 25% conversion AND they don't have the weight of a Glass tile they would outdo these tiles...



-------------------------
 05/11/2017 06:13 PM
User is offline View Users Profile Print this message


pompano

Posts: 5477
Joined: 01/06/2005

current theoretical limit is 29% Musk is pretty much the current leader of most things engineering lately, so my guess is it is a decent offering.

 05/12/2017 05:06 AM
User is online View Users Profile Print this message


miker

Posts: 4533
Joined: 04/05/2010

It looks to be a great long term investments as long as that tax credit is there and about even if it is not.

The real issue is, who the hell is going to pay 60k up front to put a new roof on when it 'may' pay for itself over 30 years.
 05/12/2017 05:18 AM
User is offline View Users Profile Print this message


somebodyelse

Posts: 5648
Joined: 06/29/2006

Traditional silicon wafers are made from a material that has to be melted at 2000 degrees in an arc furnace. This causes a lot of pollution from emissions that are produced during the production process. Perovskites are made mostly of carbon and hydrogen, as manufacturers mix up solutions of perovskites which they can spray on surfaces of virtually any shape, no furnace needed. The film itself weighs very little.

This ability to spray on the film to any surface eliminates the second drawback of silicon solar cells which is their  weight and their rigid configuration. Silicon cells work by laying them flat in large, heavy panels. Those panels are joined together in large displays that are expensive and need a large foot print to install them.

Another drawback of silicon solar cells is their static power efficiency; they have been stuck at an efficiency of 25 percent. Perovskites started out with a 4 percent power conversion rate and with improvements have reached 20% in just 7 years. Because they are so much cheaper to make and because they are more versatile in deployment, that small 5% difference is enough to make them competitive with silicon solar cells. Since the research into Perovskites is just starting it is believed that their efficiency will soon outstrip the older static silicon cells.

By stacking two perovskite solar cells that are printed on glass on top of each other they can improve the overall efficiency to over 30%. A single perovskite layer captures photons from the visible spectrum but low energy photons pass right through the layer. By matching a second layer of perovskite that captures the low energy photons with the first layer a higher efficiency is achieved.

Researchers can further optimizing Perovskites by adding coatings that minimize surface reflections which increases the amount of energy entering the array. By stacking a perovskite that strongly absorbs reddish light on top of Perovskites that absorb blue and green light more of the light spectrum can be converted to electricity.  Manufacturers are also working on larger Perovskites arrays and working with different coatings that better protect the Perovskites from the weather. Soon Perovskites may replace silicon wafers as the solar cell of choice.



-------------------------
 05/14/2017 05:37 PM
User is offline View Users Profile Print this message


pompano

Posts: 5477
Joined: 01/06/2005

sweet, we have new composite material mark, and the limit is higher.  Yea science!

The efficiency limit of perovskite cells (without the angular restriction) is about 31%, which approaches to Shockley-Queisser limit (33%) achievable by gallium arsenide (GaAs) cells. 

Bad news for the US is a lot of the research papers are coming from China these days. 

 05/14/2017 05:50 PM
User is offline View Users Profile Print this message


WG

Posts: 32570
Joined: 03/10/2005

I don't think that is such bad news.
Let's the Chinese make them.

There are jobs and profit in the installation.
 05/18/2017 04:59 AM
User is offline View Users Profile Print this message


ww

Posts: 13831
Joined: 08/17/2007

I wonder about Florida wind standards.

 05/18/2017 05:37 AM
User is online View Users Profile Print this message


miker

Posts: 4533
Joined: 04/05/2010

So yeah, great news if you can afford the 60k up front for a roof.
 05/18/2017 05:46 AM
User is offline View Users Profile Print this message


WG

Posts: 32570
Joined: 03/10/2005

A decent quality tile roof can cost more that 30K.
And this one makes power.
You pay now or you pay later.

But I think Tesla is going to have to finance these to make much of an immediate dent in the retrofit market.
 05/18/2017 05:56 AM
User is online View Users Profile Print this message


miker

Posts: 4533
Joined: 04/05/2010

Most people can't pay now whether they want to or not.

New construction and commercial construction is a possibility. Even if Tesla would and could finance them for people, most people are still not going to take out a 60k+ loan for a roof.

Hell most people won't even put on a new tile roof unless they are replacing an existing one. Why pay 30k+ for a tile roof when one can pay 12k for one that will last 18-20 years.
 05/18/2017 06:46 AM
User is offline View Users Profile Print this message


WG

Posts: 32570
Joined: 03/10/2005

Like me, I went with shingles.

"most people are still not going to take out a 60k+ loan for a roof. "

If you think of it as just a roof, no.
If you think of it as a sustainable energy supply, and big FU to the electric company, perhaps.

People spend that much on a car that's gonna depreciate like a rock.
 05/18/2017 07:07 AM
User is offline View Users Profile Print this message


stokedpanda

Posts: 2557
Joined: 09/04/2015

Originally posted by: WG


People spend that much on a car that's gonna depreciate like a rock.


Rocks actually don't depreciate all that much, according to some scientists certain rocks have lasted thousands of years.


-------------------------
I troll 2L.com to be a better person in real life
 05/18/2017 07:20 AM
User is offline View Users Profile Print this message


WG

Posts: 32570
Joined: 03/10/2005

yea, but what were they worth back then vs. now?
Nobody values rocks much these days, but Fred Flintstone did.
 05/18/2017 07:49 AM
User is offline View Users Profile Print this message


skatensurf

Posts: 2467
Joined: 09/28/2006

diamonds are expensive
 05/18/2017 10:56 AM
User is offline View Users Profile Print this message


Karma

Posts: 7834
Joined: 01/26/2005

Pretty nice if you live remote or somewhere that experiences high power costs and lots of black/brown outs...like Puerto Rico these days!

-------------------------


If you're not part of the solution, you're part of the precipitate.
 05/18/2017 09:37 PM
User is offline View Users Profile Print this message


ww

Posts: 13831
Joined: 08/17/2007

Who needs PR?  Vero Beach gets plenty of outages.  

Consumer Reports has info on cost/payoffs of Tesla roof.  

Statistics
134210 users are registered to the 2nd Light Forums forum.
There are currently 15 users logged in.

FuseTalk Basic Edition v3.2 - © 1999-2017 FuseTalk Inc. All rights reserved.

Hello to Matt B