Herm
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Re: Jumping another vehicle

Sun Nov 06, 2011 1:22 pm

bowthom wrote:Then their are all the reasons for not jump starting a dead car from any car with modern electronics. Why is the car dead? Lights left on or is their an alternator problem that will take down your system as soon as the other car starts.


It happens, also many MANY lead acid batteries explode when you make a connection to them, sometimes spewing acid all over.. ask any technician at a battery replacement center and will give you many examples. There are some cases of Priuses needing expensive repairs after a jump, but I think those were incorrect polarity hookup, a fraction of a second to do damage.

TomT 's advice is good, you can also use a dedicated jumping cord that uses the cigarette plug sockets such as this.. mostly they are used to partially recharge the dead battery:

http://www.vat19.com/dvds/easy-quick-ju ... cables.cfm

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planet4ever
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Re: Jumping another vehicle

Sun Nov 06, 2011 2:11 pm

I just skimmed this thread quickly, but I didn't see what I consider to be the most obvious point. All jump starting procedures I am familiar with say that the engine of the booster vehicle must be running when cranking the dead vehicle. This is obviously because ordinary 12v batteries don't have enough power to charge a dead battery and crank the engine at the same time; the power needs to be augmented by an alternator. Duh! The LEAF has no alternator (and having the DC/DC active is not recommended).

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scottf200
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Re: Jumping another vehicle

Sun Nov 06, 2011 3:23 pm

planet4ever wrote:This is obviously because ordinary 12v batteries don't have enough power to charge a dead battery and crank the engine at the same time; the power needs to be augmented by an alternator. Duh! The LEAF has no alternator (and having the DC/DC active is not recommended). Ray
I'm a little confused because when you jump someone you are not charging their battery per se ... when they get their vehicle started the alternator on their vehicle charges their battery. As I mentioned other EVs can jump start other cars.
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Herm
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Re: Jumping another vehicle

Sun Nov 06, 2011 4:57 pm

scottf200 wrote: I'm a little confused because when you jump someone you are not charging their battery per se ... when they get their vehicle started the alternator on their vehicle charges their battery. As I mentioned other EVs can jump start other cars.


Perhaps those other EVs are using a stronger 12v battery, the Leaf does not have a starter and only needs a deep cycle type lead acid battery, not a high starting amps type.

scottf200
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Re: Jumping another vehicle

Sun Nov 06, 2011 5:26 pm

Herm wrote:
scottf200 wrote: I'm a little confused because when you jump someone you are not charging their battery per se ... when they get their vehicle started the alternator on their vehicle charges their battery. As I mentioned other EVs can jump start other cars.
Perhaps those other EVs are using a stronger 12v battery, the Leaf does not have a starter and only needs a deep cycle type lead acid battery, not a high starting amps type.
Good point. The Volt, for example, does not have a have a traditional starter motor (per SAE article **) but uses the 45 kW 'generator motor' to start the ICE/GasGen. It does have a 600:CCA 60:AH 12v battey (picture) but this certainly does not run the 54kW motor to start the ICE/GG.

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Re: Jumping another vehicle

Sun Nov 06, 2011 9:19 pm

Hello
Well those other EV's, are they powered by 12V lead acid batteries. Then by all means a simple jump from any one of it's hi capacity 12V batteries will jump start another car. BUT, we're talking about a leaf here right?
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Re: Jumping another vehicle

Sun Nov 06, 2011 10:25 pm

This is the image I had in mind when reading the title....oops.

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Re: Jumping another vehicle

Sun Nov 06, 2011 11:07 pm

While Nissan doesn't condone it, you should have no issues jumping another car with the LEAF. Be absolutely sure to get the polarity correct, and connect the ground on the LEAF to the DC-DC converter, NOT THE BATTERY (-) TERMINAL!

Procedure: Connect the red/black jumpers directly to the Pos/Neg terminals of the dead car's battery first, then connect the red directly to the LEAF's Pos battery terminal, and then finally, connect the black jumper lead to the case of the DC-DC. The DC-DC is the large aluminum box behind the "engine looking" inverter. You can easily see the black negative terminal on top of it, which is a good place to grab. Once jumping is complete, disconnect in reverse order. Be very careful not to short the jumpers together when removing them from the LEAF.

The LEAF's DC-DC converter is about as powerful as an alternator on any normal car, and should charge a dead ICE battery enough to start it in a few minutes. No need to "rev" the LEAF! =)

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Re: Jumping another vehicle

Mon Nov 07, 2011 4:12 am

Ingineer wrote:While Nissan doesn't condone it, you should have no issues jumping another car with the LEAF. Be absolutely sure to get the polarity correct, and connect the ground on the LEAF to the DC-DC converter, NOT THE BATTERY (-) TERMINAL!

Procedure: Connect the red/black jumpers directly to the Pos/Neg terminals of the dead car's battery first, then connect the red directly to the LEAF's Pos battery terminal, and then finally, connect the black jumper lead to the case of the DC-DC. The DC-DC is the large aluminum box behind the "engine looking" inverter. You can easily see the black negative terminal on top of it, which is a good place to grab. Once jumping is complete, disconnect in reverse order. Be very careful not to short the jumpers together when removing them from the LEAF.

The LEAF's DC-DC converter is about as powerful as an alternator on any normal car, and should charge a dead ICE battery enough to start it in a few minutes. No need to "rev" the LEAF! =)

-Phil


So you are saying that using the jump leads while the vehicle is turned on is the best way to go, given one hooks up the jump leads appropriately? No need to upgrade the 12v battery either.
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Re: Jumping another vehicle

Mon Nov 07, 2011 8:47 am

JPWhite wrote:
Ingineer wrote:While Nissan doesn't condone it, you should have no issues jumping another car with the LEAF. Be absolutely sure to get the polarity correct, and connect the ground on the LEAF to the DC-DC converter, NOT THE BATTERY (-) TERMINAL!

Procedure: Connect the red/black jumpers directly to the Pos/Neg terminals of the dead car's battery first, then connect the red directly to the LEAF's Pos battery terminal, and then finally, connect the black jumper lead to the case of the DC-DC. The DC-DC is the large aluminum box behind the "engine looking" inverter. You can easily see the black negative terminal on top of it, which is a good place to grab. Once jumping is complete, disconnect in reverse order. Be very careful not to short the jumpers together when removing them from the LEAF.

The LEAF's DC-DC converter is about as powerful as an alternator on any normal car, and should charge a dead ICE battery enough to start it in a few minutes. No need to "rev" the LEAF! =)

-Phil


So you are saying that using the jump leads while the vehicle is turned on is the best way to go, given one hooks up the jump leads appropriately? No need to upgrade the 12v battery either.
Yes. Putting high loads on the little battery without the DC-DC converter is not a good idea. In fact, The DC-DC is powerful and yet current-limited, and since it is liquid-cooled, it can handle high loads much better than most car alternators. Without having the LEAF in ready, you aren't going to get much across the jumper cables from the small battery alone.

-Phil
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