[928uk] OT - Jump Leads Recommendation.

[jonathan at netvue.co.uk]

The spec sheet for that Noco GB40 device gives charging info that tells us it has a 6Ah (Ampere-hours) capacity. That equates to 360 Amp-minutes capacity.

So if you believe that its cables can really handle 1000A it would crank at 1000A for 22 secs. I suspect that more realistically it would provide 500A for 30 secs or so. Could be enough to restart a 928 if the battery is not totally flat.

Don't know how Noco justify their claim that it gives up to 20 starts on a single charge, apart from the fact that up to 20 could include just 1! 

Best regards, 

Jonathan 


  

-----Original Message-----
From: 928uk <928uk-bounces at lists.928.org.uk> On Behalf Of Simon Watson via 928uk
Sent: 03 August 2022 14:50
To: Andrew Brierley <brierley28 at virginmedia.com>
Cc: George Layton <George.Layton at ukgateway.net>; 928 UK <928uk at lists.928.org.uk>
Subject: Re: [928uk] OT - Jump Leads Recommendation.

+ 1 Andrew!
Simon

-----Original Message-----
From: Andrew Brierley <brierley28 at virginmedia.com> 
Sent: 03 August 2022 14:34
To: Simon Watson <simonwatson at unitelconsultants.co.uk>
Cc: George Layton <George.Layton at ukgateway.net>; 928 UK <928uk at lists.928.org.uk>
Subject: Re: [928uk] OT - Jump Leads Recommendation.

I would also recommend Noco GB40, I carry a pack in each car.
Regards 
Andrew

> On 3 Aug 2022, at 14:26, Simon Watson via 928uk <928uk at lists.928.org.uk> wrote:
> 
> Hi George
> 
> I spent a lot of time researching this a few years ago & am happy to share my findings.
> 
> Firstly you need a battery of around 600+ CCA Cold Crank Amps for your GTS.  340 CCA is piddly.
> 
> Secondly many jump leads are misleading.  I got some off Amazon & they looked great, but they were a con because the rubber was thick, but the copper wire strands were piddly & melted on attempting to starting a V8 (not a 928).  They were total rubbish.
> 
> You need ideally 25mm copper core or more.  Good insulation and strong insulated clamps.
> 
> The best ones for really good value price & high quality are as below at Halfords.  I have both and they are beautifully made, thick copper cores, superb insulated clamps.  I wish I had found this out at the start of my research!
> Look no further.  Seriously.
> 
> Jump Leads Halfords:
> 
> 3.5 metre length.    25mm copper core diameter
> 
> https://www.halfords.com/motoring/battery-maintenance/jump-leads/halfords-up-to-3.5l-jump-leads-438478.html
> 
> £21.99
> 
> 
> 
> 4 metre length.   35mm copper core diameter
> 
> https://www.halfords.com/motoring/battery-maintenance/jump-leads/halfords-up-to-4l-jump-leads.-438486.html
> 
> On offer £24.99
> 
> 
> Also consider Noco GB40 or Noco GBX45 small booster packs also at Halfords.  Both are excellent, small portable booster packs.  I could not believe how good they are, I have one of each.  American & beautifully made & they really work well.  
> 
> On all above, if you have a Halfords Trade card they may be cheaper.
> 
> No affiliation with Halfords.  Just passing on high Simon recommendations.
> 
> Hope that helps.
> All the best
> Simon
> 
> -----Original Message-----
> From: George Layton <George.Layton at ukgateway.net> 
> Sent: 03 August 2022 13:14
> To: 928 UK <928uk at lists.928.org.uk>
> Subject: OT - Jump Leads
> 
> Hi Chaps - A bit of help required from the collective wisdom of the list.
> 
> I need to buy some new jump leads as mine are old and a bit corroded. The information given by many of the vendors has me a bit confused!
> 
> From the Porsche PET the starter motor on my GTS is rated at 1.5kW. Even if this is based on a 10V DC supply  (I understand the battery can drop to this when cranking the engine) then the current would be 150 Amps.
> 
> The recommended Porsche battery for my 928 has a CCA rating of 340 Amps.
> 
> But, most of the vendors stipulate that for an engine over 3.5 litres you need jump leads that are rated at anything from 500 to 700 Amps! This is obviously way more than the starter motor draws and considerably more than the battery can deliver.
> 
> Is there a flaw in my logic somewhere?
> 
> What would you guys recommend?
> 
> Cheers,
> 
> George.
> 
>