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What is your voltage at idle and while driving?

Interior, exterior and warning lights

jim80 Newbie
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Hi Guys,

Please share: What voltage you get when idling and being driven.

I have a 2010 RCZ 200THP. My battery was up for replacement and I thought i would give a Lithium [LiFePO4] battery a try. I purchased a Lithiumax battery which is meant to have more CCA and AH than the standard lead acid battery. http://www.lithiumax.com.au/_p/prd1/407 ... ry---bonus!

I had problems where the battery doesn't seem to be charging after driving. I replaced the battery and it still seems to be having issues. The seller of the battery thinks i might have a problem with my car electrics and suggested i take it to an Auto Electrician to diagnose.

I wanted to get an understand what the normal voltage you guys see when your car is idling and when it's being driven.
Mine is currently reading 12.7 Volts while idling and 13.1 volts while driving.

Both of these figures seem a little low to me from what i can gather, i've read they should both be around 14V on standard older cars.

Does our ECU control regulate how much voltage the alternator creates? I read that our car can reduce the voltage to increase fuel efficiency, but this is causing a problem for me.

Otherwise it may seem that a LiFePo4 battery may not be suitable with our cars as the voltage required for 100% SOC is 13.3v vs 12.7V of lead acid.
Here is the stage of charge indicator for the LiFePo4 battery which i got from my supplier:
Fully charged resting state is 13.3-13.4V
13V ok.
Below 12.7V approx 50%.
10V approx 90% discharged.


Here is a lead acid state of charge:
Image

Thanks in advance!


tianorth User avatar

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Think that lithium batteries are different to normal batteries.
I fly a drone now and again using lithium batteries and when charging they have to balance themselves across the cells which takes time and less volts are going to the cells due to the balancing.

I'm not sure the RCZ has the smart charging system.
I know the 1007 has the smart charging system and you also have to use a special silver type battery.

Think what I've said is correct but other will be along to add their comments and to say if I am correct in my understanding.

Hope this helps.

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Tia2 is a 2013 RCZ Magnetic in Black with a 2litre diesel engine
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DKZ5745 User avatar

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Here’s mine at idle.....
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Mk 2 GT200 Moroccan Red

Plecodoras User avatar

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I have the same device as DKZ and I get the same result at idle ... 14.1 / 14.2volts, this changes when driving because the alternator is being driven and I get 14.4v - 14.5v which shows a healthy alternator.
I bought this device to check my battery and alternator before deciding which one was faulty, ( it only cost a few quid of fleabay ), it turned out my battery was dying and not holding a charge.
If you get results like above when the engine is running, then you have a healthy alternator and if your battery is still low after a run or is causing spurious electrical faults, then the battery is 100% shot. This is a sure test to check alternator / battery faults - you can also use a volt meter but this is easier. If you do not get the results above, then you have a bigger problem in that it lies with your electrics - probably the alternator.

Good luck with your issue - please report back on here your results / repair as it might help others in the same predicament in the future.

Cheers n Beers..... :beer:
:lol: Laugh and the whole world laughs with you.... or is that at you? :eusa-think:

Former owner of Dolphin Blue GT200 fully loaded inc. Quads / Xenons.
Now on second white* R
currently sporting an Avery Roaring Thunder Gloss flip colour wrap
.

CircuitMonkey Member
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Whilst waiting for a friend who is always late and fiddling with all the settings i found out you can view the voltage being supplied to the NG4 in the hidden setup menu. It was fluctuating around the 14v mark. I'll grab a screen shots today if anyone is interested how
I also finally did the voice enrollment and the speech recognition is actually usable now!

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2010 RCZ GT 200 charcoal grey
Cream leather interior
NG4 & JBL stereo upgrade
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Love it!!!

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Plecodoras User avatar

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CircuitMonkey wrote:
Whilst waiting for a friend who is always late and fiddling with all the settings i found out you can view the voltage being supplied to the NG4 in the hidden setup menu. It was fluctuating around the 14v mark. I'll grab a screen shots today if anyone is interested how
I also finally did the voice enrollment and the speech recognition is actually usable now!

Sent from my Nexus 7 2013 using Tapatalk


Funny that you've just jogged my poor memory !

I was going to ask if anyone has set up the voice commands on the audio system.

So I for one will be very interested to hear about your methods and results !! :thumbup:

:beer:
:lol: Laugh and the whole world laughs with you.... or is that at you? :eusa-think:

Former owner of Dolphin Blue GT200 fully loaded inc. Quads / Xenons.
Now on second white* R
currently sporting an Avery Roaring Thunder Gloss flip colour wrap
.


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