KillaWhat
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Re: Photovoltaic solar-panel rear spoiler

Thu Sep 26, 2013 5:32 pm

DougWantsALeaf wrote:Why not for say...1K add an option where the entire roof is a PV panel which feeds the main battery. Even if net effect is small (say 1 mile of range with 10 hours of direct sun light), city dwellers with street parking would get a minimal range increase, and need to seek 3rd party charging a little less often.



Was talking to a guy with a Fisker Karma this weekend, and noticed his entire roof (fairly big roof) appeared to be all solar cells.

Anybody know anything about that?
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JeremyW
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Re: Photovoltaic solar-panel rear spoiler

Thu Sep 26, 2013 7:47 pm

DougWantsALeaf wrote:Why not for say...1K add an option where the entire roof is a PV panel which feeds the main battery. Even if net effect is small (say 1 mile of range with 10 hours of direct sun light), city dwellers with street parking would get a minimal range increase, and need to seek 3rd party charging a little less often.

You realize that "10 hours of direct sunlight" is like 3 or 4 days right? You don't get 10 hours of direct sunlight in one day anywhere.

The fisker karma roof charges the aux battery as far as I know (read or heard that somewhere don't remember where...).
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mwalsh
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Re: Photovoltaic solar-panel rear spoiler

Fri Sep 27, 2013 2:36 am

The primary function of the Fisker's roof was to run the climate control. But it did put power into the battery pack, giving a theoretical 1 mile of range for every day in full sun.
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LeftieBiker
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Re: Photovoltaic solar-panel rear spoiler

Fri Sep 27, 2013 3:22 am

drees wrote:
patrick0101 wrote:I wrote about all the things I suggested here.

So you're the one to blame for the weak regen!!! :P

From that blog post in the section with braking spelled wrong:
My recommendation to Nissan was to keep the regen light until the brake pedal is actually touched. This makes it much easier to hypermile coast and extend the range.

Gaaahhh! You are the bane of existence of nearly all LEAF owners here! We could have had full-off-pedal regen had you suggested it instead of the opposite!


I doubt that most Leaf drivers (including me, and I have EV experience with full regen, having ridden an Oxygen Lepton for a decade) would enjoy the car with only full regen available. Normal (aka "Sport") mode makes the car vastly more fun to drive in most situations, and with a light foot you use little more energy than in Eco mode, assuming the climate control is off. I'd like to thank Patrick (?) and Nissan for giving the car a "Pleasure to Drive" mode. The only tweak I'd suggest is to make the climate control level independent of mode, and have a separate "Hi/Lo" switch for that. This would allow us to drive in 'Sport' with less energy drain from the CC as desired.
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dgpcolorado
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Re: Photovoltaic solar-panel rear spoiler

Fri Sep 27, 2013 10:33 am

DougWantsALeaf wrote:Why not for say...1K add an option where the entire roof is a PV panel which feeds the main battery. Even if net effect is small (say 1 mile of range with 10 hours of direct sun light), city dwellers with street parking would get a minimal range increase, and need to seek 3rd party charging a little less often.
It has been said before: the best place for that solar panel is on a house roof, or similar location, where it can produce a lot more electricity than when on the roof of a car.

The downsides of a PV car roof:
• Weight.
• Manufacturing complexity and attendant costs ($1k is likely to be way low)
• Possible reduction in aerodynamics of the car.
• The car roof is rarely pointed in the optimal direction for solar electricity production.
• Fragility. Most types of PV and attendant wiring are not designed for shocks and vibration over an extended time.

Can it be done? Yes, of course. Should it be done? No, the costs outweigh the benefits by a wide margin. Put the panels on a house or carport instead.
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Stanton
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Re: Photovoltaic solar-panel rear spoiler

Fri Sep 27, 2013 11:28 am

One of the reasons I did NOT get an SL was the solar panel. It didn't feed the traction battery and I felt I could get a better 12v battery down the road if I really wanted it (and I did--see my sig); I also figured it would be more trouble than it's worth if it was ever cracked or damaged. The other reason was I didn't want QC (at that time you had to get an SL to get QC).
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patrick0101
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Re: Photovoltaic solar-panel rear spoiler

Sun Sep 29, 2013 11:11 pm

drees wrote:Gaaahhh! You are the bane of existence of nearly all LEAF owners here! We could have had full-off-pedal regen had you suggested it instead of the opposite!
I have changed my tune on regen since I talked to them & wrote that. After driving a Tesla Roadster for even a short time it is easy to get used to "single pedal driving". And to be fair, I was just one voice. I am sure they wanted the car to feel familiar and that is why the regen is the way it is.
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cwerdna
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Re: Photovoltaic solar-panel rear spoiler

Mon Sep 30, 2013 2:14 am

We've had discussion on larger solar panels on the roof of a Leaf and their benefit (or rather, lack of) at viewtopic.php?f=27&t=6316.

Re: light regen while off the go pedal and not on the brakes, the Prius does that too. I don't recall on my mom's Altima Hybrid, but I think it also has that behavior.

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RegGuheert
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Re: Photovoltaic solar-panel rear spoiler

Mon Sep 30, 2013 3:11 am

KillaWhat wrote:Was talking to a guy with a Fisker Karma this weekend, and noticed his entire roof (fairly big roof) appeared to be all solar cells.

Anybody know anything about that?
JeremyW wrote:The fisker karma roof charges the aux battery as far as I know (read or heard that somewhere don't remember where...).
mwalsh wrote:The primary function of the Fisker's roof was to run the climate control. But it did put power into the battery pack, giving a theoretical 1 mile of range for every day in full sun.
Yes, I discussed the PV on the roof of a Karma with an owner also on Saturday, as well. Here is what I learned:

- The PV array on the top of the Karma looks really cool (like everything else on that car!).
- I counted the cells. There are 80. If they are all in series, that would give a peak power voltage (Vpp) of about 50V. As such, to run the 12V systems, there would either need to be a buck converter in place or this is one inefficient PV system which would massively overcharge the battery when full.
- As mwalsh said, owner said many believed it was to run the climate control system on hot days to cool the interior.
- Owner said he has never seen the climate control come on and he did not know how to enable it.

Regarding the LEAF PV array: IIRC, we have at least one report of a LEAF SL 12V battery going dead while it was parked outside.
RegGuheert
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surfingslovak
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Re: Photovoltaic solar-panel rear spoiler

Mon Sep 30, 2013 3:54 am








Fisker Karma solar roof production to begin courtesy of QuantumImage

The Karma includes as standard a solar paneled roof manufactured by Asola Advanced and Automotive Solar Systems GmbH, a Quantum Technologies affiliate, to aid the cabin climate control system. The solar roof is capable of generating a half kilowatt-hour a day and was estimated to provide up to 4 to 5 miles (6.4–8.0 km) of additional range a week assuming continuously sunny days; however, the solar panels as delivered only recharge the 12-volt lead-acid accessory battery. Additionally, Fisker will offer a set of solar panels for the garage/house which may charge the Karma without the benefit of conventional electrical sources (e.g. 'off the grid').

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