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-   -   Jumping my bike from a car (https://www.vtxoa.com/forums/5-general-mc-message-board/465198-jumping-my-bike-car.html)

Mowoc 09-20-2019 05:20 PM

Jumping my bike from a car
 
Well I finally did it.... again....

I left the keys in the bike with the bike on. Good news - no one stole it. Bad news, the battery drained. I could only jump it from a nearby car since there was nothing nearby. It was only connected for perhaps 25 seconds (long enough to start it from zero).

I figure worst case it fried the battery although it starts fine. Anything I should look for in the electrical system that might be damaged?

Harkon 09-20-2019 05:46 PM

I would not leave the car running while trying to start a bike. If the car is not running there really isn't anything that can be damaged on the bike.

Mowoc 09-20-2019 06:16 PM

agreed.

My question really was what can be damaged. If its just the battery - fine. I can deal with that. Is there something else (solenoid, or switch) that can have issues?

It seems logical that the batter might have issues if there is a power surge since it is the ingress for the jump.

BTW, the guy just started the car - I didn't even see him jump in the car. It was literally as I was keying the bike and starting it. I got home and I am safe so that part is all good.

Mowoc 09-20-2019 06:53 PM

I found this for those that are curious:

https://advrider.com/f/threads/will-...-system.66214/

Apparently its fine - the issue is not the over charging or even the running/non running. Its the spark from the dead/low battery igniting a hydrogen explosion and royally screwing your day up by throwing acid all over you. :shock:

Harkon 09-21-2019 05:21 PM

Quote:

Originally Posted by Mowoc (Post 4611602)
I found this for those that are curious:

https://advrider.com/f/threads/will-...-system.66214/

Apparently its fine - the issue is not the over charging or even the running/non running. Its the spark from the dead/low battery igniting a hydrogen explosion and royally screwing your day up by throwing acid all over you. :shock:

Right, they are both 12Vdc lead acid systems so there is nothing that could possibly damage one or the other. There is an established process by which one should connect and disconnect to minimize the possibility of injury.


I the case the car is running and the bike starts, you now have two charging systems of significantly different capacities possibly creating a conflict. There is a possibility the rectifier/regulator of the bike might be damaged if the jumper cables are not removed quickly upon starting. As the car battery has significant capacity to start a bike, and restart the car afterwards, it makes sense to me to take the extra precaution of leaving the car ignition off. Only as a precaution mind you.

skeeter69392 09-21-2019 11:19 PM

yup with the car off
jumped bikes,,atv,,lawnmowers no issues

Blaine C 09-22-2019 08:46 AM

Quote:

Originally Posted by Harkon (Post 4611794)
Right, they are both 12Vdc lead acid systems so there is nothing that could possibly damage one or the other. There is an established process by which one should connect and disconnect to minimize the possibility of injury.


I the case the car is running and the bike starts, you now have two charging systems of significantly different capacities possibly creating a conflict. There is a possibility the rectifier/regulator of the bike might be damaged if the jumper cables are not removed quickly upon starting. As the car battery has significant capacity to start a bike, and restart the car afterwards, it makes sense to me to take the extra precaution of leaving the car ignition off. Only as a precaution mind you.

With car running its more amps that the bike system was designed for...Can also destroy the ECU....(Seen it happen more than once)

TennX 09-22-2019 09:22 AM

AS mentioned be careful when jumping anything...as a young man I went to help a stranger ....battery blew up in my face...only thing that saved my eyes that time were my sunglasses.....:thumbup:

Donnie Downer 09-22-2019 10:08 AM

I was expecting something completely different

https://youtu.be/7ax-9yJs78Y

enduro 09-22-2019 11:47 AM

Quote:

Originally Posted by Blaine C (Post 4611866)
With car running its more amps that the bike system was designed for...Can also destroy the ECU....(Seen it happen more than once)

At a set voltage you can't force excess electricity into something, the load determines the current. Your bike battery alone is capable of over 100A. A car/truck works on a 12V system same as the bike, both systems are charged from 14.2-14.4V charging systems. Standard alternators output less than 100A, a high output alternator is capable of 100-150A output and so is your bike battery. If you charge off a non-running vehicle or just a bare auto battery it might be capable of providing over 1000A from a full size battery. Doesn't matter as the bike (the load) determines how much current it will use. You could have a dual battery system capable of over 2000A and it still isn't going to hurt the bike. You can't force excess current thru a load while holding the voltage constant, electrical laws prevent it.

At home you have a 200A service with multiple 20A receptacles, plug in a .004A (.5W) night light and it doesn't blow because 20A is available. It uses what it needs and you can't force more through it.
A running diesel truck with dual batteries can supply over 2000A from the batteries and additionally 150A from the alternator. Nothing electrical is turned on, you open the door and the little inside cab light comes on. It is not damaged even though over 2150A are available, because the voltage is held at 14V and the current (load) is determined by the light itself, constant voltage and constant load equals constant current.


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