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: [email protected]
Sent: 29 August 2021 19:24
To: [email protected]
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 , <[email protected]> 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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