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Gtir Motorsport club » Tech room » Help and Advice » Battery relocation

Battery relocation

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1 Battery relocation on 11th March 2017, 8:31 pm

Stephenc4877


Any of you guys know what size fuss I need to run with a battery relocation.

2 Re: Battery relocation on 11th March 2017, 8:51 pm

nomad

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Mines straight to the battery with no fuse ... where are you planning to stick the fuse ... are you locating the battery to the boot ???


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3 Re: Battery relocation on 11th March 2017, 9:34 pm

Stephenc4877


Close to the battery incase the cable ever rubs on metal it will stop a straight short. Yea either boot or behind the passenger seat mines just for the track so I've no back seats.

4 Re: Battery relocation on 11th March 2017, 10:36 pm

gtir_woody

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Mines behind the drivers seat. Run a circuit breaker switch rather than a fuse, at least if it trips during high load you can reset it.

5 Re: Battery relocation on 12th March 2017, 1:14 pm

ADSgtir


Battery relocation :
1. Use quality cable
This involves avoiding halfords , yeah I know they open on Sunday's ,but they stock total shit , they source Chinese shit , wherever possible as it maximises profits . -Avoid
Cheap Chinese cable use a plastic outer insulation , this has poor fire resistance , read about as close to zero as is possible , it also has poor conductor wires - so the cable has to be thicker as a result .
The longer cable run at high current can drop voltage along its length .
Quality cable will be at least 2 cable sizes thinner , carry the same current , has insulation good to 400volt plus (despite being thinner) and will withstand a direct short circuit or fire for 10 mins - this gives you time to pull over and switch off ignition .
A circuit breaker is a good idea , next to the battery , and quite cheap around £25 , breakers need to be in open air if possible ( not buried under carpet or such ) as they are thermal devices .
Fuses and breakers actually pass more than the rating on them but only for fractions of a second and if too warm will keep tripping as a nuisance - breakers are better than fuses .
Try a test : get 3 inches of halfords cable and put under a fag lighter - watch what happens = your car full of black choking smoke and on fire !!! - causing more short circuits as it burns !!

6 Re: Battery relocation on 12th March 2017, 9:20 pm

johnny gtir

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Do you run. Fuse/breaker or risk a short ? Thought those breakers had a nasty habit of tripping over bumps in the road etc ?

7 Re: Battery relocation on 12th March 2017, 10:02 pm

gtir_woody

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Good point, I know Stu was/ is running one for a long time?

8 Re: Battery relocation on 12th March 2017, 10:07 pm

ADSgtir


A decent circuit breaker should never trip over bumps , there are different types , panel mounted , flush mounted etc , those with a soft push to reset /trip would be more likely to trip if mounted horizontal .
Panel mounted , although a bit bigger and needing a panel making would never trip - these they fit in aircraft - it would be disaster if every CB tripped on landing .
My car came with the battery relocated and is both poor cable and unprotected - another job to do , any short will give over 1000 amps and weld the cable , much smoke and drama !
I would guess that the insurance would not pay out for a total loss
Some cars have OEM boot mounted batteries and will have fusible links , you could use cables and links etc from one of these from the breakers - Mini Cooper s , Volvo , merc , BMW etc

9 Re: Battery relocation on 12th March 2017, 10:16 pm

ADSgtir


Secondly, the Communities and Local Government office figures reveal, 68 per cent of the 12,000 accidental car fires were caused by vehicle defects with "wire and battery" problems sparking the lion's share. Only seven per cent of car fires were caused by crashes.

From a telegraph article

10 Re: Battery relocation on 13th March 2017, 2:14 am

gtir_woody

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I was driving along once and the battery terminal grounded on the bonnet, there was ALOT of smoke lol

11 Re: Battery relocation on 13th March 2017, 7:31 am

johnny gtir

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agree but as I say a lot you see listed certainly ain't aircraft standard they are for audio systems which are none critical if they trip. Just buy wise.

What is the general size 60-80A or ?

12 Re: Battery relocation on 13th March 2017, 7:40 am

gtir_woody

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Been trying to find the thread, Stu and I were talking about this if my memory is right .

13 Re: Battery relocation on 13th March 2017, 8:56 am

ADSgtir


In one direction , you have your charge current , so what is the alternator max out put ? 100 amp ? , in the other direction you have your cold cranking output to the starter .
There is a factor for starter current usually around 3 , ( any fuse or breaker takes more than it's rated amperage for a very short time) this happens due to something called back EMF (everyone's asleep now - lol) it's a small engine , so I would say 100-150 fuse breaker should cover it .
Once upon a time I had a classic mini , and the engine earth came off , probably rusted off , and it decided to use the choke cable as the return - FIRE !! , smoke pouring out of the dash and bonnet ...:..
After that I've always fitted a fire extinguisher either front of drivers seat or in the boot .
All my jap cars seem to have a boot release , they must have known you can run to the boot and leave the key in the ignition -lol
Saying that , I've not yet fitted a firex to the pulsar .....
Strangely if you tell your insurance , they put up your premium ..... Non OEM standard fitment ??????

14 Re: Battery relocation on 13th March 2017, 9:45 am

ADSgtir


agree but as I say a lot you see listed certainly ain't aircraft standard they are for audio systems which are none critical if they trip. Just buy wise.

What is the general size 60-80A or ?

Unfortunately wise buying seldom happens with car wiring/ electrics , often many thousands are spent and many hours spent choosing car components . Cranks , pistons ,cams , ecu and so on , but the wiring ... About £4.99

15 Re: Battery relocation on 14th March 2017, 8:37 pm

shroom

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Hmm I wish my Pulsar would set on fire sometimes lol

16 Re: Battery relocation on 14th March 2017, 9:01 pm

johnny gtir

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