WoodlandHills
Posts: 751
Joined: Mon Sep 15, 2014 4:50 pm
Location: SoCal

Why is the roof black?

Tue Sep 23, 2014 8:50 am

So why does an electric car with limited power and a marginal a/c system have a black roof?
Clipper Creek HCS-40P 32a EVSE
2014 REx Arravani Grey Giga all options
2008 Infiniti EX35
2008 smart ForTwo Cabriolet
2000 F-250 Powerstroke
2006 Westfield eleven
1984 Laverda RGS-1000

Boxbrownie
Posts: 78
Joined: Sat Sep 06, 2014 10:21 am
Location: Pastyland, UK

Re: Why is the roof black?

Tue Sep 23, 2014 9:27 am

Keeps you warmer on cold days............helps you a lot there doesn't it? ;)
Best regards........David

If anything in my post offends you please let me know, I may wish to offend you again. ;)

MikeS
Posts: 713
Joined: Thu Jan 16, 2014 8:29 am
Location: Brighton UK

Re: Why is the roof black?

Tue Sep 23, 2014 9:49 am

What makes you think the a/c is marginal? Mine works as well as the ones in my other cars.
BMW 3 Series 2005 - Aug 2014
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WoodlandHills
Posts: 751
Joined: Mon Sep 15, 2014 4:50 pm
Location: SoCal

Re: Why is the roof black?

Tue Sep 23, 2014 10:05 am

MikeS wrote:What makes you think the a/c is marginal? Mine works as well as the ones in my other cars.
We test drove the i3 on a 107 degree day, the car had been sitting in the sun all day, and it took over 30 minutes to cool off the interior. Our smart sat in the sun in our driveway not 4 miles away for the same time and it was cooled off in the 15 minutes it took to drive there. Ditto our Infiniti...... To me that indicates that the a/c could use some help.

BTW, this is typical summer heat where I live, not every single day, but quite common nonetheless. A car designed for city use, ie running errands ought to be able to cool the vehicle between stops and shops. Perhaps they should have Northern and Southern versions?

Maybe when charge points are more widespread people will just keep the a/c running in Precondition mode when parked and plugged in. That way the car would be cool when they came out and that way they could waste more energy than an ICE defeating the purpose of going EV. And why not when power is often free.....?
Clipper Creek HCS-40P 32a EVSE
2014 REx Arravani Grey Giga all options
2008 Infiniti EX35
2008 smart ForTwo Cabriolet
2000 F-250 Powerstroke
2006 Westfield eleven
1984 Laverda RGS-1000

Boxbrownie
Posts: 78
Joined: Sat Sep 06, 2014 10:21 am
Location: Pastyland, UK

Re: Why is the roof black?

Tue Sep 23, 2014 12:36 pm

MikeS wrote:What makes you think the a/c is marginal? Mine works as well as the ones in my other cars.
Mike...........Southern Calfornia vs Brighton

He may have a point........ :lol:
Best regards........David

If anything in my post offends you please let me know, I may wish to offend you again. ;)

jackt
Posts: 178
Joined: Sun Mar 02, 2014 4:57 am
Location: Leeds, Yorkshire, UK

Re: Why is the roof black?

Tue Sep 23, 2014 12:51 pm

Can't speak about baking heat, but the roof is just clear-coated CFRP it has no paint on it at all.

I suspect its mainly cosmetic, but also maybe problematic to attach a plastic painted panel to the roof :s

If you take a close look it has a cool pattern to it.
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i3Alan
Posts: 266
Joined: Wed Jul 09, 2014 4:08 pm

Re: Why is the roof black?

Tue Sep 23, 2014 12:57 pm

WoodlandHills wrote:We test drove the i3 on a 107 degree day, the car had been sitting in the sun all day, and it took over 30 minutes to cool off the interior.
Was that with Max AC in Comfort mode? Or, were you in Eco Pro mode, which reduces cooling, and not using the Max setting, which will not engage automatically?

Before I bought mine, I test drove one that had been sitting in 109 sun baking, and it, too, cooled down quite rapidly.

My i3 in Phoenix with 107 and higher temps cools down in a few minutes on Max AC, which is good, because it is too noisy to leave it on Max!

WoodlandHills
Posts: 751
Joined: Mon Sep 15, 2014 4:50 pm
Location: SoCal

Re: Why is the roof black?

Tue Sep 23, 2014 1:41 pm

It was in Comfort and Max a/c. The car was a ReX if that makes any difference. It was an extreme test and I expect that the cooling is adequate, but it still wonder why a black roof.
Clipper Creek HCS-40P 32a EVSE
2014 REx Arravani Grey Giga all options
2008 Infiniti EX35
2008 smart ForTwo Cabriolet
2000 F-250 Powerstroke
2006 Westfield eleven
1984 Laverda RGS-1000

jadnashuanh
Posts: 4766
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Why is the roof black?

Tue Sep 23, 2014 1:48 pm

No extra paint on the roof means a few pounds less weight. I think they did it more for the style thing...to show the CFRP. You could always plastic-wrap it in white or a reflective metallic if you wanted to as some have done since they don't like the black hood, either.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

i3Alan
Posts: 266
Joined: Wed Jul 09, 2014 4:08 pm

Re: Why is the roof black?

Tue Sep 23, 2014 4:46 pm

WoodlandHills wrote:It was in Comfort and Max a/c. The car was a ReX if that makes any difference. It was an extreme test and I expect that the cooling is adequate, but it still wonder why a black roof.
I'm wondering if the REX has less cabin cooling capacity than the BEV. Both the test drive and my i3 are BEVs. I do know there is a difference in the cooling systems between the two.

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