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Jump Leads.

 
 
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Pat4d
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Joined: 20 Feb 2008
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Location: Stroud, Gloucestershire



PostPosted: Tue Nov 16, 2010 4:15 pm    Post subject: Jump Leads. Reply with quote

I am thinking of getting some jump leads from Santa, does anyone have any recomendations?
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mrcheese
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PostPosted: Tue Nov 16, 2010 4:30 pm    Post subject: Reply with quote

Bigger, as in thicker, is better. Try and take a look at the way the cable is crimped into the clamp. Cheap ones can have very poor connections.
This can cause high resistance joints or just plain fall apart.

Now I think about it, I must replace my set.
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Kitesurf
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PostPosted: Tue Nov 16, 2010 4:40 pm    Post subject: Reply with quote

I made my own using welding cable. It is available from electrical wholesalers. It is meant for automated welding machines in factories. The multistranded section of the wire is about 1CM in diameter. Mine have done some serious cranking and never even got warm. The biggest problem is finding decent clamps to go on the ends.
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mellowip1983
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PostPosted: Sat Nov 20, 2010 5:20 pm    Post subject: Reply with quote

Yep I made a set out of welding cable too, absoloutly brilliant couldnt get anything that good in the shops[/quote]
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jeepjeep
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Joined: 29 Dec 2009
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PostPosted: Sat Nov 20, 2010 7:52 pm    Post subject: Reply with quote

what size cable did you use?

and how long did you make them?

I see on ebay an 800amp rated 6m set uses 12.5mm cable and is £30
Possibly rating is peak in short burst

Would like a decent set but don't want to pay £100's, also don't want the entire boot filled with heavy wire.... whats the best compromise?
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Twiss
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Joined: 18 Feb 2008
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Location: Birkirkara, Malta


1993 Suzuki Samurai

PostPosted: Sat Nov 20, 2010 8:32 pm    Post subject: Reply with quote

Phil and mellow, that's a good idea!!!

I've currently got cheapo ones, seem to be alright cranking a suzuki over though!
I bet they would struggle with a big diesel engine!

I like the X-Jump system, seems quite useful, if a little pricey...

http://www.x-eng.co.uk/X-Jump.asp




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spannerman69
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PostPosted: Sat Nov 20, 2010 8:54 pm    Post subject: Reply with quote

i made a set up the same as those using battery leads from winch solutions and a pair of clips from the local motor factors , i mounted the snap connector to the front bumper.
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Twiss
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PostPosted: Sat Nov 20, 2010 9:02 pm    Post subject: Reply with quote

Sounds good!

I'm glad I've currently got a decent battery and a working alternator!!!
I might rig something up if I start doing stuff for South East 4x4 response!

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Twiss
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Nathaniel
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Joined: 13 May 2003
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1979 Suzuki LJ

PostPosted: Sun Nov 21, 2010 10:36 pm    Post subject: Reply with quote

I have a superb pair of jumpleads, wish I could remember where they came from, really heavy wiring, starts lorries without breaking sweat, and long enough to jump off a vehicle sat on the trailer from the towcars battery!
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big_patrol
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PostPosted: Thu Nov 25, 2010 5:42 am    Post subject: Reply with quote

I have the very heavy duty ring ones from a local truck parts place (Hydrair) they are very thick and good quality wire that bends nicely. There are also long as nat says they will start our waggon and reach to the rear mounted battery on my car when I drive to the front of it with another. I reckon 10 feet. think they were £42 and worth every penny. Every time I use them on someone elses car where they're feable ones have failed they have followed suit and bought some.
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cornish redneck
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PostPosted: Thu Nov 25, 2010 9:53 pm    Post subject: Reply with quote

i made a set of jump leads from heavy duty winch cable and bought a set of 4 anderson 50amp plugs off ebay http://shop.ebay.co.uk/items/__anderson+connect...f4=284591_284611, ive got them on front bumper, rear bumper, jump leads and on a small compressor. saves lifting the bonnet and messing around, just plug in and off you go.
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Twiss
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PostPosted: Fri Nov 26, 2010 12:44 am    Post subject: Reply with quote

That sounds like a good jump lead arrangement cornish, i might have to make something similar...
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cornish redneck
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PostPosted: Sat Nov 27, 2010 1:37 am    Post subject: Reply with quote

it just makes life so much easier twiss, you can use jump leads from the front or the back, which ever suits your needs, on the front i got a heavy duty battery isolator switch that switches the winch on and off and powers up the plug but the back is a permanent supply but needs a switch.
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leeds
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PostPosted: Wed Dec 01, 2010 9:34 am    Post subject: Reply with quote

jeepjeep wrote:
what size cable did you use?

and how long did you make them?

I see on ebay an 800amp rated 6m set uses 12.5mm cable and is £30
Possibly rating is peak in short burst

Would like a decent set but don't want to pay £100's, also don't want the entire boot filled with heavy wire.... whats the best compromise?



800 amp rated?????ROFLMAO

For 850 amp booster rated cable on a 30% duty cycle you would need 95mm2 cable. Weight of jump leads per metre made from this sort of cable would weigh 2 kg/metre!

Battery clips capable of handling 800 amps would be absolutely massive!

Typical 175 amp continuously rated Anderson connectors can only handle 800 amps for about 2 seconds. The 350 amp Anderson connectors are about twice the size of the 175 SB connector. The 175 amp SB connector will not take 95mm2 cable


Have had a quick look on ebay and 800 amp jump leads abound. With outer gauge of 12.5mm. What does that mean? What is the actual cross sectional area of the current carrying wires? What material is the current carrying conductors made from? How many strands/diameter of strands in the current carrying conductors?

What does the 800 amp refer to? Continuous, 30% 2% duty cycle???

Battery clips not fully insulated. Could be fun in a Defender battery box


This is the system I use/make.



35mm2 twin cable (1083 x 0.2 mm copper strands) rated at 500 Amps for 30% duty cycle, clips rated at 300 amps fully insulated. 175 amp continuously rated Anderson connectors.


HTH


Brendan

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tc1
Winch Assistant


Joined: 24 Sep 2007
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PostPosted: Thu Dec 02, 2010 6:49 am    Post subject: Reply with quote

spannerman69 wrote:
i made a set up the same as those using battery leads from winch solutions and a pair of clips from the local motor factors , i mounted the snap connector to the front bumper.


Don't forget to fuse/switch the socket for two reasons

1) could get interesting in the event of an accident/impact on the socket
2) The RAC/AA had a spate of little tykes shoving bent rod in to the sockets to knock out security systems and that resulted in a couple of toasted vans

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leeds
Just got MTs


Joined: 08 Jul 2004
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Location: Leeds



PostPosted: Thu Dec 02, 2010 11:03 am    Post subject: Reply with quote

tc1 wrote:
spannerman69 wrote:
i made a set up the same as those using battery leads from winch solutions and a pair of clips from the local motor factors , i mounted the snap connector to the front bumper.


Don't forget to fuse/switch the socket for two reasons

1) could get interesting in the event of an accident/impact on the socket
2) The RAC/AA had a spate of little tykes shoving bent rod in to the sockets to knock out security systems and that resulted in a couple of toasted vans


Also for external connectors use the rubber dust cover and pvc sleeves. Will not make them waterproof but will help to prevent corrosion, crud building up on the contacts.

HTH

Brendan

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Wuff_Wider
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PostPosted: Fri Dec 03, 2010 12:57 pm    Post subject: Reply with quote

I've boughty some from Bolt On Bits on e-bay for £45, 5 metres long with an Anderson socket!
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leeds
Just got MTs


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Location: Leeds



PostPosted: Fri Dec 03, 2010 6:38 pm    Post subject: Reply with quote

Wuff_Wider wrote:
I've boughty some from Bolt On Bits on e-bay for £45, 5 metres long with an Anderson socket!


The Bolt on Bits one do NOT have an Anderson socket. They use a 'Anderson type' connector and cable is not 35mm2 but 25mm2 cable with 150 amp clips

We use genuine Anderson connectors, twinflex 35mm2 cable and 300 amp clips


Brendan

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Wuff_Wider
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PostPosted: Fri Dec 03, 2010 9:29 pm    Post subject: Reply with quote

God, why are men always so concerned with size!

Was I bragging? No, all I said was what I'd got, I wasn't stating anything in particular!
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leeds
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Joined: 08 Jul 2004
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PostPosted: Thu Dec 09, 2010 10:02 am    Post subject: Reply with quote

Actually size does matter!

The current carrying capacity of a cable depends on many factors, one being cross sectional area and the conductivity of the cable! Razz

Just found out that copper cable prices have rocketed! Up about 50% in about 8 months!


No wonder many people are selling aluminium and brass 'jump leads'


Brendan

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Kitesurf
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PostPosted: Thu Dec 09, 2010 5:54 pm    Post subject: Reply with quote

Yep, size does matter. The current that will flow in a copper conductor is proportional to the cross sectional area of the conductor.

33 * (I/A)^2 * S = log( (Tm - Ta) / (234 + Ta) + 1 )

I = current in Amperes
A = area of wire in circ. mils
S = time the current flows in seconds
Tm = melting point, C
Ta = ambient temp, C

If you do the maths for 25mm conductor wire and 35mm conductor wire you will see the difference.

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bertie_bas205
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PostPosted: Thu Dec 09, 2010 5:56 pm    Post subject: Reply with quote

Kitesurf wrote:
Yep, size does matter. The current that will flow in a copper conductor is proportional to the cross sectional area of the conductor.

33 * (I/A)^2 * S = log( (Tm - Ta) / (234 + Ta) + 1 )

I = current in Amperes
A = area of wire in circ. mils
S = time the current flows in seconds
Tm = melting point, C
Ta = ambient temp, C

If you do the maths for 25mm conductor wire and 35mm conductor wire you will see the difference.


EH???





Bertie. Confused
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Twiss
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PostPosted: Thu Dec 09, 2010 7:55 pm    Post subject: Reply with quote

http://www.epanorama.net/documents/wiring/wire_resistance.html

It's like pouring stuff through a hose pipe versus a straw

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Twiss
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cornish redneck
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PostPosted: Sat Dec 11, 2010 12:09 am    Post subject: Reply with quote

thats one way of putting it twiss, keeping it simples Wink
kind of makes sense actually. Very Happy

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** GED **
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PostPosted: Sat Mar 10, 2018 7:26 pm    Post subject: Reply with quote

silly fucker ^^^^^^^^ put "doctor in his occupation!!

yeah......

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Nightbar
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PostPosted: Sat Mar 10, 2018 8:07 pm    Post subject: Reply with quote

I getting annoyed about this ^^^ lol (but you knew that Ged)
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PostPosted: Sat Mar 10, 2018 10:48 pm    Post subject: Reply with quote

So there isn't a doctorate for spamology?
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