DougWantsALeaf
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Idea for Nissan

Sat Apr 19, 2014 8:56 pm

On the SL model, have the solar cell power a small battery temp control system. Even if it can't maintain temperature in very hot or cold weather, it could still "help" keep the temp closer to the optimal temps.
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TomT
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Re: Idea for Nissan

Sat Apr 19, 2014 9:02 pm

It puts out about 4-5 watts. Not enough to accomplish anything.
DougWantsALeaf wrote:On the SL model, have the solar cell power a small battery temp control system. Even if it can't maintain temperature in very hot or cold weather, it could still "help" keep the temp closer to the optimal temps.
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DougWantsALeaf
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Re: Idea for Nissan

Sat Apr 19, 2014 9:15 pm

wow, that's really horrible. Had thought it was a little better then that. surprised they even bothered with it.
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TomT
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Re: Idea for Nissan

Sat Apr 19, 2014 9:32 pm

It's designed to trickle charge the 12V battery and nothing else...
DougWantsALeaf wrote:wow, that's really horrible. Had thought it was a little better then that. surprised they even bothered with it.
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Nubo
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Re: Idea for Nissan

Sat Apr 19, 2014 10:50 pm

DougWantsALeaf wrote:wow, that's really horrible. Had thought it was a little better then that. surprised they even bothered with it.
It's more of a cosmetic statement than anything else. I really hate having to explain to the curious that this is the case.

If they'd wanted to do something useful they could have powered a small fan to expel heated air from the cabin.
I noticed you're still working with polymers.

DaveinOlyWA
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Re: Idea for Nissan

Mon Apr 21, 2014 4:58 pm

DougWantsALeaf wrote:wow, that's really horrible. Had thought it was a little better then that. surprised they even bothered with it.
its a feel good thing. Are you familiar with the Gen 3 Prius with the sunroofs? They are also PV and they powered a circulation fan that helped to keep the interior "cooler" of course, sometimes it was cooling it down to 100º which i guess was better than 120 right?

But look at the size of those panels. They are like 20X larger than the LEAFs and a lot of times, the energy was barely enough to run the fan at low speed. Had to have full direct Sun to get anything out of it
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DougWantsALeaf
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Re: Idea for Nissan

Mon Apr 21, 2014 7:39 pm

Ok,

For the math or science wiz out there. If you were to cover the entire roof with the latest record breaking solar panel (which just hit north of 44% energy capture), and it was in near direct sun for 6 hours, how many watts or Kw could be theoretically captured?
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cwerdna
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Re: Idea for Nissan

Mon Apr 21, 2014 10:34 pm

^^^
Some previous discussion at http://www.mynissanleaf.com/viewtopic.php?f=27&t=6316" onclick="window.open(this.href);return false;.

http://en.wikipedia.org/wiki/Solar_cell ... ficiencies" onclick="window.open(this.href);return false; has a chart that I've seen elsewhere before about efficiency of various solar panel technologies. I'm not even close to being an amateur on the subject but from what understand, the panels that can produce power from the widest set of wavelengths (http://en.wikipedia.org/wiki/Multijunct ... tion_cells" onclick="window.open(this.href);return false; ?) are generally very expensive and used only in applications where power output is absolutely needed and keeping the weight and size down is critical (e.g. space applications).

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DougWantsALeaf
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Re: Idea for Nissan

Tue Apr 22, 2014 1:17 pm

Admittedly to use the multilayer cells, it would be space craft expensive to get the 44+%, but would be curious to understand how many miles could charge in a day a kind of a best case.

For single layer, your at 25.7% max per latest news I have seen, so just over half of a best case.
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Zurc
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Re: Idea for Nissan

Fri Aug 01, 2014 8:54 pm

There is about 3000 Watts in a square meter of Sunlight to be had.
so assuming 44% efficiency, that's about 1320Watts which at 12V would be around 110 amps.
So if the entire leaf roof was used, it could probably do some serious charging of that 12V battery.
It would be nice to know what that panel on the Leaf is capable of.
Normally there's about 2A on a trickle charge so unless there's a really efficient panel there, I seriously doubt it can do much.


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