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garygid
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Re: Tow to recharge

Thu Jul 29, 2010 5:34 pm

The parking brake is to keep the car from rolling away when it is parked on an incline.

It tends to hinder towing also, because the "locked" wheels cause the tires to slide ... and wear a flat spot on the bottom side!

But, that will not bother a towing company, if you are illegally parked, for example.
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EVDRIVER
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Re: Tow to recharge

Thu Jul 29, 2010 6:48 pm

Even if you could get t to work it the reason it is dangerous is with any drive engaged, if one wheel is the drive wheel the car will putt to one side and veer out. In neutral there is no strong torque steer.

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garygid
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Re: Tow to recharge

Thu Jul 29, 2010 6:50 pm

If one actually tried this tow-charging, it would be a lot safer to have a driver in the LEAF.

Totally unsafe without the driver, I think.
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planet4ever
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Re: Tow to recharge

Fri Jul 30, 2010 12:27 am

Why is no one is asking what mileage the tow truck will be getting during this process? Let's face it, "free-moving" is not going to apply if the Leaf is being dragged in Eco mode. It will be more like pulling a mule against its will.

No, wait! I've got a great idea for how two Leafs can make a long trip: Hook one Leaf in front of another one, and let Leaf#1 pull Leaf#2, which is in Eco mode, for a while. Then stop and reverse the two: Let Leaf#2 pull Leaf#1 for a while. Keep switching until you get there. :lol:
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LTLFTcomposite
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Re: Tow to recharge

Fri Jul 30, 2010 6:51 am

planet4ever wrote:Why is no one is asking what mileage the tow truck will be getting during this process? Let's face it, "free-moving" is not going to apply if the Leaf is being dragged in Eco mode. It will be more like pulling a mule against its will.

No, wait! I've got a great idea for how two Leafs can make a long trip: Hook one Leaf in front of another one, and let Leaf#1 pull Leaf#2, which is in Eco mode, for a while. Then stop and reverse the two: Let Leaf#2 pull Leaf#1 for a while. Keep switching until you get there. :lol:


Exactly why a truck-mounted L3 charger would be pretty cool. If you can get 80% charge in 26 minutes, that suggests you're picking up 2-3 miles of driving for every minute of L3 charging. So if you had a Leaf dead on the side of the road, five minutes of charging off the truck should be plenty to get you home or to a public charging site assuming you aren't out in the sticks somewhere. Less time, hassle, and risk to the vehicle than loading it on a flatbed.

I wonder what the highway range of Leafs would be if they were drafting, say 2 or 3 cars.
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DaveinOlyWA
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Re: Tow to recharge

Fri Jul 30, 2010 11:31 am

Quixotix wrote:
DaveinOlyWA wrote:towing an EV that has regen enabled can be done, but without the vehicle's ability to control regen, it could damage the system which is the reason why any "reasonable" car company would recommend against it.


But the car does have the ability to control the regen! As garygid pointed out, there is no difference between towing the car at 35 for 3 miles or coasting down a hill at 35 for 3 miles. Since you live here in Washington (as I do), you know it isn't hard to find a 3 mile long hill that you can coast down at speed. The Leaf must protect its self when coasting, so by default it will protect its self when being towed (assuming the car is on). Again, the car can't even tell if it is coasting down a hill or being flat-towed -- thus there can't possibly be a difference.

Now, if you tow it a longer distance (like maybe over 10 miles), then maybe there could be a problem. Since this is probably longer than the longest hill you can find, the car might not be designed to handle periods of regen that last this long. But, I'll go out-on-a-limb here and suggest that the Leaf can probably regen continuously for hours as long as the batteries are not fully charged. The small amount of power produced by the regen process isn't likely to tax the motor, inverter, or batteries (up to full charge). Driving 70 mph for 1 1/2 hours is going to demand a lot more of all these systems than doing regen for a couple of hours.

If the car is off, then things might be different. Possibly this is why it has an electronic parking brake. Does the parking brake self-apply when the car is off? If so, this might be to protect it from being towed when it is off (just a wild guess).

There is a lot of difference Between coasting downhill Using only gravity tower As opposed to being towed. The difference is more than enough To get the lawyers all in a bunch N receive the recommendation to not do it
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LeafHopper
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Re: Tow to recharge

Fri Jul 30, 2010 1:51 pm

A more reasonable approach

kmcmahan
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Re: Tow to recharge

Fri Jan 27, 2012 7:30 am

Just as a note to this thread, I drove my leaf 9 miles up a mountain from elevation 2600 to 4500 feet with just a couple of power bars left at the start. I wanted to see what happened when I ran out of range. I ran out of power bars and the range went to hash marks. At that time I turned the car around to coast down hill and regenerate. Under normal conditions my range increases and I gain a power bar on the way down. The leaf did in fact regenerated but refused to display any range or power bars. I know that I gained power on the way down, but it looks like the program will not allow range or power bars to show until hooked to a charger.

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TimeHorse
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Re: Tow to recharge

Fri Jan 27, 2012 9:33 am

When I come home I usually pick up my mail from the top of my pipestem then release the break and put it in neutral; I coast down hill and get about the first third of the car into my garage before I have to switch to drive (if my HomeLink is able to open it that day!)
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planet4ever
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Re: Tow to recharge

Fri Jan 27, 2012 3:45 pm

kmcmahan wrote:Just as a note to this thread, I drove my leaf 9 miles up a mountain from elevation 2600 to 4500 feet with just a couple of power bars left at the start. I wanted to see what happened when I ran out of range. I ran out of power bars and the range went to hash marks. At that time I turned the car around to coast down hill and regenerate. Under normal conditions my range increases and I gain a power bar on the way down. The leaf did in fact regenerated but refused to display any range or power bars. I know that I gained power on the way down, but it looks like the program will not allow range or power bars to show until hooked to a charger.
By "coast", I assume you mean in gear but with your foot off the accelerator. The normal meaning of coast is moving with the car in neutral, and you wouldn't be regenerating at all in that mode. Your experience is interesting, but not conclusive. Now, if you normally gained two or more bars down that mountain, then I think you might have some strong evidence, but one is - as they say - within the margin of error.

Incidentally, your terminology is a bit off. Power is really the rate at which you are expending energy. The dots across the top of the dash are showing you power. The long bars on the right side of the dash are giving you an indication of how much energy is stored in your battery, or as the manual puts it, an "available charge gauge".

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