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Home > Help Needed / General Tech Chat > Cranking amps? (Mega fuse selection)..

TurboDave16V
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Anyone know what a typical cranking amperage is? I want to put a mega fuse adjacent to the battery for the main battery cable.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


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Sprocket

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Preston On The Brook

I think I've got a 200 amp on mine. I've got it on the ground strap.

In all honesty, i'm only really protecting against a dead short (Pinched or trapped battery cable), so anything substantial will do. A dead short produces thousands of amps and fuses blow instantaneously.

What's the battery and battery cable rated to? those are the bits you need to protect

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


TurboTom

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DK-8450 Hammel. Denmark

I think Mr. Sprocket got it right.
As i recall the starter uses 160 amps. A bit more if it is Cold. A bit more if it is low on voltage. + 10% is the rule of thumb.
200 amp fuse sounds just about right. *smiley*

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Ben H

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Melton Mowbray, Pie Country

You really need a slow blow or a motor fuse. The peak current of the starter motor will be quite high, but the steady state will be more reasonable.

What type of starter do you have. The built in solenoid or geared type typically have lower current.

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TurboDave16V
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SouthPark, Colorado

I'm still using inertia starter, but changing to the geared type over winter when I redo the wiring again.
I'm just wanting to run this as a safety measure in case of an accident or whatever else so the fuse pops before some very bad stuff happens.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Who remembers this first time around: https://www.youtube.com/watch?v=JF0a5aoEGsw


stevieturbo

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Northern Ireland

Buy a cheap DC current clamp meter and test.
Handy tool to have and very inexpensive these days.

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Sprocket

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Preston On The Brook

Worst case I=V/R

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


TurboDave16V
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SouthPark, Colorado

I thought clamp-on meters only worked with AC?

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Who remembers this first time around: https://www.youtube.com/watch?v=JF0a5aoEGsw


jonny f

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Dorking


On 5th Jul, 2017 TurboDave16V said:
I thought clamp-on meters only worked with AC?


You can get DC ones as well.


stevieturbo

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I think that's the same as the one I have, would need to check part numbers.
But DC versions are cheap now.

http://www.ebay.co.uk/itm/Signstek-UNI-T-U...qkAAOSwyWZZS-X~

Or if you have a scope, you can buy various versions for that

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


stevieturbo

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http://www.ebay.co.uk/itm/Hantek-CC-650-AC...119.m1438.l2649

http://www.ebay.co.uk/itm/Hantek-CC-65-AC-...119.m1438.l2649

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


wil_h

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Betwix Harrogate and York

Most clamp meters you see on ebay are hall probe type that measure AC and DC.

They're useful occasionally, but not really a fault finding tool. More a system checking tool.

For the question Dave asked, 200A should be sufficient. I've measured the current in the past with a clamp meter and never seen much over 100A.

But I never checked the surge as the motor started.

I've got a 200A on my single seater (or is it 300A?) anyway, it works!

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TurboDave16V
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SouthPark, Colorado

Well Strip me naked and call me Susan .
I've never bothered buying a clamp on meter because I thought they were all AC only, which I guess was correct 20 years ago LOL.
That is great info and will be purchased forthwith *smiley*

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Who remembers this first time around: https://www.youtube.com/watch?v=JF0a5aoEGsw


Sprocket

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Preston On The Brook

fat thumbs.....

Edited by Sprocket on 6th Jul, 2017.

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Sprocket

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Preston On The Brook

Dc inrush is different to ac inrush as there is no real reactance in dc motors. Current draw is proportional to torque so as torque increases to overcome the load, current increases quickly and then levels off. So DC peak current of a motor is I=V/R

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Nick
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Midlands

I've fitted a 200a breaker in mine, didn't fancy getting stuck somewhere with a blown fuse. Makes a handy isolation point too

On 20th Oct, 2015 Tom Fenton said:

Well here is the news, you are not welcome here, FUCK OFF.


stevieturbo

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Northern Ireland



On 6th Jul, 2017 wil_h said:
Most clamp meters you see on ebay are hall probe type that measure AC and DC.

They're useful occasionally, but not really a fault finding tool. More a system checking tool.

For the question Dave asked, 200A should be sufficient. I've measured the current in the past with a clamp meter and never seen much over 100A.

But I never checked the surge as the motor started.

I've got a 200A on my single seater (or is it 300A?) anyway, it works!


Clamp meters are very very handy, and an excellent tool. Even more so when combined with a scope.

Being able to verify current draw on circuits without needing to fuck about and do it in seconds....there are no downsides.

And even if not using the clamp for current, it's handy to use as a hanger for the meter lol

Edited by stevieturbo on 10th Jul, 2017.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

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