Oddness? - Renault Z.E. Forum
 
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post #1 of 10 (permalink) Old 07-18-2014, 07:24 AM Thread Starter
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Oddness?

Throwing it open to your collective thoughts......


I've had my Fluence since mid feb. It had 5k on when I took ownership and I've done another 6.5k since. I have never reset the MpKWh, or range and have watched both steadily increase since purchase before appearing to rear a plateau. The MpKWH had until about 2 weeks ago remained steady at a peak of around 4. Since this time it has been going down at a rate of about 0.04 every couple of days and is now getting on for about 3.65.

I've checked tyre pressures and even put a bit of air back in but it's still going down. The weird thing is that this appears to be in contrast to the SOC gauge which appears to be showing better than ever efficiency. I have been driving in a more sedate manner to see if it would abate the decline in MpKWh but it hasn't. For example I completed a round trip of 22miles consuming about 3/16 of the SOC gauge which by my calculations would be about 4.125kw translating into about 5.33MpKWh, so why on earth the overall figure has decreased by the end of the journey I have no idea?


Anyone have any ideas or should I just ignore it???

Cheers.

Aaron

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post #2 of 10 (permalink) Old 07-18-2014, 07:37 AM
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RE: Oddness?

If the mi/kWh is overall, then those are relatively big changes to make that happen in a short period of time.

3.6 is a bit low for summer, and you'd have to be significantly under that to weight the average.

Not sure what to say. More air con? Less regen? (This distorts the mi/kWh)

If the mi/kWh isn't saying much - or just note it down if you like - just reset it and check your individual journeys. 3.5 in winter and 4.5 in summer are my 'typical', not-try-to-be-economical, trips.

Your 3/16ths may be 4/16th if it was from fully charged. You can use around 1.5kWh off a full battery before the SOC needle points to the top of the 8th SOC octal.
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post #3 of 10 (permalink) Old 07-18-2014, 07:45 AM Thread Starter
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RE: Oddness?

Yes it was fully charged. The overall figure is low but it was a round 2.5 when I took possession so it is blighted by that to an extent. But yes I agree that it is dropping at quite a rate with the SOC gauge telling what I believe to be a different tale. I'm going to reset it today and then run it to Foss park and back which will be between 60-70 mile round trip and see what happens.[hr]
I also wonders if it could be taking into account the electricity used by the cooling fans while on charge but why drop during a trip zzzzz
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post #4 of 10 (permalink) Old 07-18-2014, 08:33 AM
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RE: Oddness?

The only numbers of any real merit are how much electricity *you put in* (which is about 10% more than you actually use), and how many miles you can get. The gauges are imperfect.
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post #5 of 10 (permalink) Old 07-18-2014, 04:23 PM
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RE: Oddness?

The various readouts on the computer are quite fanciful, I have questioned their accuracy (and behaviour) more than once, indeed this was a specific request when the car went in for service. I had noted that since the previous visit during which the onboard computers had been changed things had definitely got worse and I asked them to investigate. Of course I've not had a chance to speak to a technician so not sure what they have done. Now if I reset the trip other entries on the computer are also reset - quite daft. I presume Mr. Microsoft has had his hand in the system!

It's actually a miracle I'm able to send this message, the computer's Windows has been going pear-shaped for a couple of days and I was forced to do a reset this morning - which judging by how it's been behaving just now has not been successful. Thank God (Allah?) that've it's dual booted with Linux. That can't go wrong as it's botted up from a CD every time - avoids loads of hassle.

The M/kwh figure on mine indicates that I get somewhere around 115-126 miles per charge. If only! i arrived at my distination this afternoon after a short run to find it reading 6.08 - not bad, eh?

The last charge was predicted to take me 96 miles and it actually took me 94. I reset the computer and this morning, fully charged, it will take me an imaginary 63. At least it all provides amusement when not having to fillde around with gears and the like on a run......
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post #6 of 10 (permalink) Old 07-18-2014, 06:25 PM
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RE: Oddness?

Quote:
Originally Posted by william
after a short run to find it reading 6.08 - not bad, eh?
I've never seen mine read that high, and you know I can drive like an angel and better the NEDC 115 miles. So yours is reading high and Aaron's is reading low.

hrug:

Everything I do I judge only on my current meters measuring input energy. Unfortunately the transmitter seems to be having problems at the moment and I am 'blind' when I charge just now. In the process of fixing it.
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post #7 of 10 (permalink) Old 07-19-2014, 03:58 PM Thread Starter
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RE: Oddness?

It's ok (or is it ). Did the reset before the trip yesterday. Car loaded with the wife, 1yo, buggy, and I. 74 mile round trip as went elsewhere afterwards 5.01 at journey's end. Range shown as 90 miles when I got in it this am. Incidentally resent the consumption and after 22kw was 104.7 miles.

Ganesh knows why it now doesn't want to tell me I'm catastrophically inefficient?

I'm going to put it down to it being French and having done 6.5k in 5 months and feeling hard done by. I assume it will go on strike at some point!
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post #8 of 10 (permalink) Old 07-19-2014, 05:25 PM
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RE: Oddness?

Sounds good to me!
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post #9 of 10 (permalink) Old 09-18-2014, 04:11 AM
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RE: Oddness?

It's time this anti-France phobia died away. After all they managed to get electric cars on the road while Germany is still struggling and our lot are still thinking about it.

I've had tons of cars from all over, and the French ones are still the most favourably remembered. And usually ten years ahead of the rest, viz : Citroen Traction Avant, Renault Espace, Citroen DS

And let's forget that nonsense about un reliability too. If you think a French farmer is content to see his car break down when all he's done is blasted it across a field or to the south in blistering heat on his vacation, think again. It's down to maintenance, many French cars fall into the hands of cheapskate Brits who think nothing of skipping services. Just ask your local garage, they'll tell you most drivers only visit at MoT time, never buy winter tyres, never check tyre pressures or oil levels, and drive for weeks with light bulbs out.

If you want poor reliability try Range Rover. I've owned four and adore them, it's the best car in the world, but my, is it terrible. Then try the 75,000 Mercedes SL - ditto, but even more expensive to put right. Or what about my Bentley Continental, squeeking like a trapped rat this week, the day AFTER coming back from a 1500 eighth year service. Don't even ask about my experiences with BMW and Audi, you don't want to revive bitter memories, the only time I've had a car break down abroad was with one of Germany's best! And not one of the cheaper tiddlers, this was the mighty Seven Series. My wife still shudders at having her Audi Quattro stop dead in the outside lane of the M25 marooning her behind a wall of fast moving traffic. I still shudder at paying for a new V6 for an Audi A6.

Now that we have electric Renaults and Citroens with no oil or filters to change expect even fewer Brits to bother the local garage, especially as they will be leased car, so servicing, they tell us, is just for mugs. So running gear like brakes, suspension, and steering will be looked at by nobody from one year to the next. And then we'll hear the whines from the little dears that their car is a dud.

Heaven preserve us all from the smug anti-French bar-room pundits.

The answer? Get the car down to the electric car specialist for recall items. Get the car down to your local family garage twice a year to check brake pads discs and pipes, suspension bushes, underbody panels, the inside walls of tyres, and to check steering alignment. Call it a safety check, if you like, but don't wait three years for the MoT. Get them to change to and from winter tyres at the same time. Yes, granddad, you do need them.

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post #10 of 10 (permalink) Old 09-18-2014, 05:57 AM
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RE: Oddness?

Very much a point I have often made in the past. I have had several french cars in my history. For one reason or another I currently have 3 Renaults - mainly that they offer (or at least did offer, the Espace being dropped from UK now) cars fit for tasks that no-one else makes.

Anyhow, when confronted with an argument that says, for example, Mercedes are more reliable than Citroen, I simply point out that if a Citroen had 500 a year spent on it in servicing then it'd be concours condition. These cars are DESIGNED not to be maintained, because they know full well the average french agro worker will hammer it hard and never service it. That has a knock-on consequence that it has a limited life, but maintain it well and it'll go on well beyond its design years. Mercs and the like are designed to BE maintained, so it is hardly surprising they will last longer.

There is a 'mob behaviour' to car maintenance - if a 10 year old Merc needs a 500 job you might say 'ah, it is worth paying, because it has value', but it has value because it has been maintained. Whereas when faced with the same bill for a 10 year old Citroen you'd say the car isn't even worth that because these cars don't last. Of course they won't last if you don't pay for repairs!!! It's a circular thing. Metal is metal. Electronics are electronics. And they all come from the same 1st tier suppliers. VMs very rarely make the bits that fail, they make the body and seats and buy in the parts and bolt it all together.

So what, really, is the difference between a Citroen or Renault to a Merc? Go check the reliability index, if you think Mercs are more reliable.
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