Little car start boosters

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Little car start boosters

Unread post by GL » Sun Aug 18, 2019 1:01 pm

Can these little car boosters start a diesel? The wires look too small to deliver 300 amps.
Can you travel with one in your hand or checked luggage?
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Re: Little car start boosters

Unread post by heisan » Sun Aug 18, 2019 2:47 pm

A similar looking one started my landruiser (4.2 diesel) once. Had to leave it hooked up for about 5 minutes to get some charge into the main battery, but it did start.
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Re: Little car start boosters

Unread post by GL » Sun Aug 18, 2019 3:43 pm

Thanks - so you use it to recharge the cars battery - not just to jump start?
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Re: Little car start boosters

Unread post by Iceberg » Sun Aug 18, 2019 4:27 pm

I've used mine to jump start small petrol cars - works well. But then I tried it once on my Diesel Prado - no go.
I have never thought about using it to charge up the main battery though. Will try that next time I need it.
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Re: Little car start boosters

Unread post by heisan » Mon Aug 19, 2019 9:29 am

GL wrote:
Sun Aug 18, 2019 3:43 pm
Thanks - so you use it to recharge the cars battery - not just to jump start?
It is supposed to be a 'jump start'. But there is no way you can get enough current out of them to start a big diesel. They are however capable of giving about 20% boost charge to the car battery - which is usually enough unless the battery is completely dead or damaged.
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Re: Little car start boosters

Unread post by Jack Welles » Mon Aug 19, 2019 9:59 am

Help a non-tech! What's the difference between this and the "Jump Starter" that I have that the blurb on the box says it delivers 400 amp/1000 peak (whatever that means?)?
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Re: Little car start boosters

Unread post by HJK 414 » Mon Aug 19, 2019 10:18 am

Jack Welles wrote:
Mon Aug 19, 2019 9:59 am
Help a non-tech! What's the difference between this and the "Jump Starter" that I have that the blurb on the box says it delivers 400 amp/1000 peak (whatever that means?)?

Eddie,

The small pocket size unit that GL showed is a 12000mah (milli Ampere Hour) unit.
12000 Ma = 12 Amp.

Your is 300 Amp / that is 25 times stronger as a constant power unit.

The little ones can start a small car - (and you usually have only one shot at it) but a big diesel requires your "toy"

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Re: Little car start boosters

Unread post by heisan » Mon Aug 19, 2019 10:44 am

HJK 414 wrote:
Mon Aug 19, 2019 10:18 am
Jack Welles wrote:
Mon Aug 19, 2019 9:59 am
Help a non-tech! What's the difference between this and the "Jump Starter" that I have that the blurb on the box says it delivers 400 amp/1000 peak (whatever that means?)?

Eddie,

The small pocket size unit that GL showed is a 12000mah (milli Ampere Hour) unit.
12000 Ma = 12 Amp.

Your is 300 Amp / that is 25 times stronger as a constant power unit.

The little ones can start a small car - (and you usually have only one shot at it) but a big diesel requires your "toy"

JK
There is a big difference between 'A' (Amps) and 'Ah' (Amp hours). Amps is a measure of current, and is what is needed to start a car (most cars require ~300A surge current followed by ~100A cranking current - big diesel cars about double that).

Ah is a measure of capacity - i.e. how long they can deliver current for.

The small pack that GL showed should be able to deliver 300A quite easily - but not for as long, and at a lower voltage than the big jump pack that JW shows. (It may be worth noting that most of this type of jump pack has a 20Ah 12V lead acid battery in - so not much more than the 12Ah of the little pack. I won't go into Wh ratings though - but there things differ substantially.)
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Re: Little car start boosters

Unread post by Ugly Duckling » Mon Aug 19, 2019 10:48 am

Jack Welles wrote:
Mon Aug 19, 2019 9:59 am
Help a non-tech! What's the difference between this and the "Jump Starter" that I have that the blurb on the box says it delivers 400 amp/1000 peak (whatever that means?)?

EHS_0700 (Small).JPG
The item in your picture has a 17 or 26 Amp hour sealed lead acid battery inside, if a 12 volt model. That is usually enough to get a 4 liter diesel started if the internal battery is partly discharged.

The Dinky Toy units have delivered checkered results. I have 6 in my workshop which were used on cars less than 2 litres which have all failed.
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Re: Little car start boosters

Unread post by Jack Welles » Mon Aug 19, 2019 11:01 am

heisan wrote:
Mon Aug 19, 2019 10:44 am
There is a big difference between 'A' (Amps) and 'Ah' (Amp hours). Amps is a measure of current, and is what is needed to start a car (most cars require ~300A surge current followed by ~100A cranking current - big diesel cars about double that).

Ah is a measure of capacity - i.e. how long they can deliver current for.

The small pack that GL showed should be able to deliver 300A quite easily - but not for as long, and at a lower voltage than the big jump pack that JW shows. (It may be worth noting that most of this type of jump pack has a 20Ah 12V lead acid battery in - so not much more than the 12Ah of the little pack. I won't go into Wh ratings though - but there things differ substantially.)
My unit has been really effective on a number of occasions with ordinary cars - also twice on my petrol Land Cruiser - not sure if that takes more than an ordinary car??) Now not sure from what was said if it would work on a "big" diesel?

On my unit is the 1000 "peak" the "surge current? And the 400 the cranking current?

Sorry if these are hopelessly inane questions 8-[

As an aside: why-oh-why do I find this stuff virtually incomprehensible when legal and accounting concepts are crystal clear?
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Re: Little car start boosters

Unread post by heisan » Mon Aug 19, 2019 11:34 am

Jack Welles wrote:
Mon Aug 19, 2019 11:01 am
On my unit is the 1000 "peak" the "surge current? And the 400 the cranking current?

Sorry if these are hopelessly inane questions 8-[

As an aside: why-oh-why do I find this stuff virtually incomprehensible when legal and accounting concepts are crystal clear?
Yup - 1000A is the surge rating, and 400 cranking. Landcruiser starter is 2.5kW - so around 300A cranking and 900A surge. Well within the capabilities of your jump starter.
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Re: Little car start boosters

Unread post by Jack Welles » Mon Aug 19, 2019 11:40 am

Ugly Duckling wrote:
Mon Aug 19, 2019 10:48 am
Jack Welles wrote:
Mon Aug 19, 2019 9:59 am
Help a non-tech! What's the difference between this and the "Jump Starter" that I have that the blurb on the box says it delivers 400 amp/1000 peak (whatever that means?)?
The item in your picture has a 17 or 26 Amp hour sealed lead acid battery inside, if a 12 volt model. That is usually enough to get a 4 liter diesel started if the internal battery is partly discharged.
Help! Sorry if these are seriously dof questions. I do appreciate the info being given to me, now I'd really appreciate it if you could explain what this means? Is the diesel car battery the "internal" one or is the "Jump Start" battery the "internal" one? And why does it have to be "partly discharged"?
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Re: Little car start boosters

Unread post by Ugly Duckling » Mon Aug 19, 2019 11:46 am

Internal, mounted in the vehicle.
If it was not partially discharged we would not need to jumpstart it :shock:
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Re: Little car start boosters

Unread post by Jack Welles » Mon Aug 19, 2019 11:49 am

Ugly Duckling wrote:
Mon Aug 19, 2019 11:46 am
Internal, mounted in the vehicle.
If it was not partially discharged we would not need to jumpstart it :shock:
:D so are you saying that if it is "completely" discharged it wouldn't start it?
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Re: Little car start boosters

Unread post by GL » Mon Aug 19, 2019 1:26 pm

UD - are you sure those little units haves a lead acid battery? - I rather imagined it was new Lithium Ion or whatever?
ie a new technology - and more ok for deep cycle heavy discharge.
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