Re: [Quantum Owners] starter cable current

2021-08-29 Thread julian 

Thanks all.

On 2021-08-29 21:10, susanandmartin wrote:

The Cold Cranking Amps is often given as a figure on the battery. To be 
sure, if you aren't worried about the weight or cost, you could fit the 
largest available that will fit with an eyelet terminal that fits the 
starter post, going for bigger cable is preferable as you say.


Martin Scott

Sent from Mail [1] for Windows 10

From: jul...@cityaudioservices.com
Sent: 29 August 2021 19:24
To: quantumowners@googlegroups.com
Cc: Darren Siepka
Subject: Re: [Quantum Owners] starter cable current

Hi Darren.

That seems logical given the cable lengths. Thanks. Fortunately my 
cable runs will be shorter.


I've done a fair bit of digging and like many other such questions the 
disagreement on the forums is fascinating with debate getting heated!


The nearest I can get to any degree of certainty is that the expected 
current is likely to be under 200A initial peak, dropping rapidly to 
somewhat less - something in the range 100-150A. These numbers are 
taken from several threads about similar (and bigger, inc diesel) 
engines so the chances are they are on the high side but are in a 
decent ball park. Anyway, it is unlikely to be more and over-estimating 
current is preferred!


Clearly the voltage drop is what is most important, it must be small 
compared to battery V. I came across this site (which avoids doing 
calculations the hard way and maybe getting them wrong) 
https://www.12voltplanet.co.uk/cable-sizing-selection.html   which has 
a calculator. If I calculate based on 1m each way this gives me a V 
drop of less than 0.25V at 150 A on 25mm2 cable (ie <2% of the 
voltage). So that looks like a good option.


Unless anyone thinks that absurd, I'll give it a go and confirm by 
measurement.


Regards

Julian

On 2021-08-29 18:27, Darren Siepka wrote:

I use welding lead cable for my main lines, especially as I have the 
battery In the boot.


Size wise I use 35 and 50 mm2 cross section.

Reason I use welding lead cable is it tends to be more flexible with 
thicker tougher plastic covering, and best of all usually cheaper too 
:-)


Darren

On Sun, 29 Aug 2021, 13:56 ,  wrote:

Hi

My H4 is fitted with a 2L silver top and I want to replace the main 
power cables (starter and ground). Can anyone advise what the current 
rating should be?


I suspect the existing wiring was for the original Fiesta 1.6 Zetec so 
potentially is too lightweight. I have found a ~50Ahr battery that fits 
the original cradle (which was for a ~40Ahr battery). So I must have ~ 
20% increase in cranking amps too. Some 50Ahr batteries are able to 
generate 450A crank current, but I assume (given the options available 
from suppliers) cables do not have to be rated at this current (and it 
is short duration). So what is used?


Any help appreciated.

Many thanks

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RE: [Quantum Owners] starter cable current

2021-08-29 Thread susanandmartin 
The Cold Cranking Amps is often given as a figure on the battery. To be sure, 
if you aren’t worried about the weight or cost, you could fit the largest 
available that will fit with an eyelet terminal that fits the starter post, 
going for bigger cable is preferable as you say.
Martin Scott

Sent from Mail for Windows 10

From: jul...@cityaudioservices.com
Sent: 29 August 2021 19:24
To: quantumowners@googlegroups.com
Cc: Darren Siepka
Subject: Re: [Quantum Owners] starter cable current

Hi Darren.
That seems logical given the cable lengths. Thanks. Fortunately my cable runs 
will be shorter.
I've done a fair bit of digging and like many other such questions the 
disagreement on the forums is fascinating with debate getting heated! 
The nearest I can get to any degree of certainty is that the expected current 
is likely to be under 200A initial peak, dropping rapidly to somewhat less - 
something in the range 100-150A. These numbers are taken from several threads 
about similar (and bigger, inc diesel) engines so the chances are they are on 
the high side but are in a decent ball park. Anyway, it is unlikely to be more 
and over-estimating current is preferred!
Clearly the voltage drop is what is most important, it must be small compared 
to battery V. I came across this site (which avoids doing calculations the hard 
way and maybe getting them wrong) 
https://www.12voltplanet.co.uk/cable-sizing-selection.html   which has a 
calculator. If I calculate based on 1m each way this gives me a V drop of less 
than 0.25V at 150 A on 25mm2 cable (ie <2% of the voltage). So that looks like 
a good option. 
Unless anyone thinks that absurd, I'll give it a go and confirm by measurement.
Regards
Julian
  
 
On 2021-08-29 18:27, Darren Siepka wrote:
I use welding lead cable for my main lines, especially as I have the battery In 
the boot.  
Size wise I use 35 and 50 mm2 cross section.
Reason I use welding lead cable is it tends to be more flexible with thicker 
tougher plastic covering, and best of all usually cheaper too :-)
 
Darren

On Sun, 29 Aug 2021, 13:56 ,  wrote:
Hi
My H4 is fitted with a 2L silver top and I want to replace the main power 
cables (starter and ground). Can anyone advise what the current rating should 
be? 
I suspect the existing wiring was for the original Fiesta 1.6 Zetec so 
potentially is too lightweight. I have found a ~50Ahr battery that fits the 
original cradle (which was for a ~40Ahr battery). So I must have ~ 20% increase 
in cranking amps too. Some 50Ahr batteries are able to generate 450A crank 
current, but I assume (given the options available from suppliers) cables do 
not have to be rated at this current (and it is short duration). So what is 
used?
Any help appreciated.
Many thanks

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Club nor the individuals associated with the Quantum Owners Club or in the 
preparation of the above information shall have any liability to any person or 
entity with respect to liability, loss, or damage caused or alleged to be 
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Club nor the individuals associated with the Quantum Owners Club or in the 
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Re: [Quantum Owners] starter cable current

2021-08-29 Thread julian 

Hi Darren.

That seems logical given the cable lengths. Thanks. Fortunately my cable 
runs will be shorter.


I've done a fair bit of digging and like many other such questions the 
disagreement on the forums is fascinating with debate getting heated!


The nearest I can get to any degree of certainty is that the expected 
current is likely to be under 200A initial peak, dropping rapidly to 
somewhat less - something in the range 100-150A. These numbers are taken 
from several threads about similar (and bigger, inc diesel) engines so 
the chances are they are on the high side but are in a decent ball park. 
Anyway, it is unlikely to be more and over-estimating current is 
preferred!


Clearly the voltage drop is what is most important, it must be small 
compared to battery V. I came across this site (which avoids doing 
calculations the hard way and maybe getting them wrong) 
https://www.12voltplanet.co.uk/cable-sizing-selection.html   which has a 
calculator. If I calculate based on 1m each way this gives me a V drop 
of less than 0.25V at 150 A on 25mm2 cable (ie <2% of the voltage). So 
that looks like a good option.


Unless anyone thinks that absurd, I'll give it a go and confirm by 
measurement.


Regards

Julian

On 2021-08-29 18:27, Darren Siepka wrote:

I use welding lead cable for my main lines, especially as I have the 
battery In the boot.

Size wise I use 35 and 50 mm2 cross section.
Reason I use welding lead cable is it tends to be more flexible with 
thicker tougher plastic covering, and best of all usually cheaper too 
:-)


Darren

On Sun, 29 Aug 2021, 13:56 ,  wrote:


Hi

My H4 is fitted with a 2L silver top and I want to replace the main 
power cables (starter and ground). Can anyone advise what the current 
rating should be?


I suspect the existing wiring was for the original Fiesta 1.6 Zetec so 
potentially is too lightweight. I have found a ~50Ahr battery that 
fits the original cradle (which was for a ~40Ahr battery). So I must 
have ~ 20% increase in cranking amps too. Some 50Ahr batteries are 
able to generate 450A crank current, but I assume (given the options 
available from suppliers) cables do not have to be rated at this 
current (and it is short duration). So what is used?


Any help appreciated.

Many thanks

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"As Is" basis, without warranty or the implication thereof. Neither 
the Quantum Owners Club nor the individuals associated with the 
Quantum Owners Club or in the preparation of the above information 
shall have any liability to any person or entity with respect to 
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Quantum Owners Club nor the individuals associated with the Quantum 
Owners Club or in the preparation of the above information shall have 
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Re: [Quantum Owners] starter cable current

2021-08-29 Thread Darren Siepka 
I use welding lead cable for my main lines, especially as I have the
battery In the boot.
Size wise I use 35 and 50 mm2 cross section.
Reason I use welding lead cable is it tends to be more flexible with
thicker tougher plastic covering, and best of all usually cheaper too :-)

Darren

On Sun, 29 Aug 2021, 13:56 ,  wrote:

> Hi
>
> My H4 is fitted with a 2L silver top and I want to replace the main power
> cables (starter and ground). Can anyone advise what the current rating
> should be?
>
> I suspect the existing wiring was for the original Fiesta 1.6 Zetec so
> potentially is too lightweight. I have found a ~50Ahr battery that fits the
> original cradle (which was for a ~40Ahr battery). So I must have ~ 20%
> increase in cranking amps too. Some 50Ahr batteries are able to generate
> 450A crank current, but I assume (given the options available from
> suppliers) cables do not have to be rated at this current (and it is short
> duration). So what is used?
>
> Any help appreciated.
>
> Many thanks
>
> --
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> You received this message because you are subscribed to the Google Groups
> "Quantum Owners Group" group.
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> To unsubscribe from this group, send email to
> quantumowners-unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/quantumowners?hl=en
>
> IMPORTANT NOTE: All information presented herewith is provided on an "As
> Is" basis, without warranty or the implication thereof. Neither the Quantum
> Owners Club nor the individuals associated with the Quantum Owners Club or
> in the preparation of the above information shall have any liability to any
> person or entity with respect to liability, loss, or damage caused or
> alleged to be caused directly or indirectly by the instructions contained
> within this or related message(s).
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> "Quantum Owners Group" group.
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> email to quantumowners+unsubscr...@googlegroups.com.
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> https://groups.google.com/d/msgid/quantumowners/c426461d1cbcdb73f5801ec1ba4a2090%40cityaudioservices.com
> 
> .
>

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