Jumping battery if alone?

[TIDALWAVE]

What are the minimum amps required to turn over the engine and how long a time would be required?
It appears that most emergency starting packs may have the required amps for the first couple of seconds...but then power quickly drops off,
The only difference between a second vehicle providing the emergency start and a starting pack would be the length of time of maximum amperage.
Has anyone measured the minimum requirements to start a depleted system?
Do emergency starting packs give the amount of power over time they produce?

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[WranglerMan]

What are the minimum amps required to turn over the engine and how long a time would be required?
It appears that most emergency starting packs may have the required amps for the first couple of seconds...but then power quickly drops off,
The only difference between a second vehicle providing the emergency start and a starting pack would be the length of time of maximum amperage.
Has anyone measured the minimum requirements to start a depleted system?
Do emergency starting packs give the amount of power over time they produce?

That is a good question, I have been looking at NOCO boosters but have no idea what to get since it’s a duel system

 

[AlamedaJeep]

Does anyone have any real life experience with this yet (besides those that have jumped from other vehicles)?

I was at the dealer the other day, and saw a guy going around with a cart jumping a Wrangler JL. He said the batteries ran down often on their lot. He said he had jumped lots of JLs and that they jumped the same as any other car. I don't know if the cart he was rolling around made any difference.

 

[GRAK]

Does anyone have any real life experience with this yet (besides those that have jumped from other vehicles)?

I was at the dealer the other day, and saw a guy going around with a cart jumping a Wrangler JL. He said the batteries ran down often on their lot. He said he had jumped lots of JLs and that they jumped the same as any other car. I don't know if the cart he was rolling around made any difference.

What kind of cart did he have?

 

[fat_head]

Does anyone have any real life experience with this yet (besides those that have jumped from other vehicles)?

I was at the dealer the other day, and saw a guy going around with a cart jumping a Wrangler JL. He said the batteries ran down often on their lot. He said he had jumped lots of JLs and that they jumped the same as any other car. I don't know if the cart he was rolling around made any difference.

I ran my battery down overnight one time. I attempted to use a fully charged jump pack from Amazon and it didn't not work. I had to use jump cables.

 

[aml]

I know it isn’t a Jeep JL in the video...

 

[Rhinebeck01]

@aml

I'll bet you a few $ that a 12v power pack (Noco, etc.) cannot get a JL started, that has both batteries depleted. Betcha.

 

[aml]

@aml

I would be glad to bet you a few $ that a 12v power pack (Noco, etc.) cannot get a JL started, that has both batteries depleted. Betcha.

if you remember, that’s why I ended up ordering the dual battery. I don’t trust it. I will keep the NOCO in addition to the dual batteries.

 

[Jebiruph]

If this is the case, would not a poor man's solution to the OP's problem be to, once out on the road and stopped, disconnect the cables from the main battery (2 seconds with a drill as in the video), and connect all your gear to (only) this now electrically isolated main battery?

If you run that main battery all but dead, (not that I suggest you do) ( and reconnect its cables prior to crank???) as long as the ESS battery has juice--a battery you didn't connect to for your accessories--so it should have power, wouldn't the rig turn over to then begin charging both the main and ESS batteries?

...and it might (I just don't know) have to involve connecting back the main battery AFTER the rig has turned over. I admit to not knowing what happens if the rig sees a dead main battery compared to NO main battery when it attempts an initial (as opposed to an ESS) crank.

The way I would do this is pull the positive off of the main battery as you suggest, but I would then leave everything as is, running the accessories off of the aux battery, saving the main battery for starting. Then reconnect the positive back to the main battery when you are ready to start. I would be prepared with a jumper to bypass the aux battery just in case. https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/. If I was going to be stationary for a while, I would pull the aux ground cable off of the main battery negative terminal to prevent the aux battery from draing the main battery.

 

[Jebiruph]

Does anyone have any real life experience with this yet (besides those that have jumped from other vehicles)?

I was at the dealer the other day, and saw a guy going around with a cart jumping a Wrangler JL. He said the batteries ran down often on their lot. He said he had jumped lots of JLs and that they jumped the same as any other car. I don't know if the cart he was rolling around made any difference.

Connecting two batteries in parallel is almost never a good idea, especially when the batteries are not identical. They tend to drain each other. I don't remember the technical details, google probably knows. That will contribute to the batteries running down often. The amount of boost to get them started would depend on how ran down the batteries were.

 

[RussJeep1]

The way I would do this is pull the positive off of the main battery as you suggest, but I would then leave everything as is, running the accessories off of the aux battery, saving the main battery for starting. Then reconnect the positive back to the main battery when you are ready to start. I would be prepared with a jumper to bypass the aux battery just in case. https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/. If I was going to be stationary for a while, I would pull the aux ground cable off of the main battery negative terminal to prevent the aux battery from draing the main battery.

I see you erring on the side of caution by using the ESS battery as the campsite power source.

But I also see the ESS battery not being able to supply much current for very long to campsite items.

To which you'd probably suggest, and I'd agree, "time to get a bigger ESS battery."

I don't see you disagreeing that my suggestion is plausible, just that yours might be a better approach for insurance reasons.

 

[Jebiruph]

I see you erring on the side of caution by using the ESS battery as the campsite power source.

But I also see the ESS battery not being able to supply much current for very long to campsite items.

To which you'd probably suggest, and I'd agree, "time to get a bigger ESS battery."

I don't see you disagreeing that my suggestion is plausible, just that yours might be a better approach for insurance reasons.

The aux battery seems subject to sudden, unpredictable failures, so I wouldn't want to rely on it and would rather do with less accessory availability.

 

[sjappers]

I use one of these as a backup. I have used it to start a tractor trailer. It is pretty stout!

I have this also, will it work iwth the dual battery setup for JL?

 

[Rhinebeck01]

I have this also, will it work with the dual battery setup for JL?

I had a JL, no start situation. A tow guy came with a brand new power pack ... I believe it was 6000 amps. The guy had charged it up overnight and I was first customer that day he used the power pack on. NO, would not start the JL. All it managed to do was get the evic lights to light up and no more.

So, we took battery cables and used his flat bed truck battery bank as the donor. Hooked up the battery cables and let it sit for say 3-5 minutes and YES, the JL started right up.

IF, if I thought a power pack like your would do the deed, I would have one in the back of my JL. Can tell you, I carry battery cables in the back all the time now.

.

 

[aml]

I have this also, will it work iwth the dual battery setup for JL?

I don’t know for sure...I used it recently in a different dual battery system. It wouldn’t start right away...but I left it connected for a few minutes and it then started the vehicle up. That being said I still don’t like not having quick access to that smaller starting battery, so I am yanking it out.

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