craggles
EV Enthusiast
Posts: 18 
LEAF OWNER?: Yes
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Post by craggles on Sept 27, 2016 16:11:27 GMT 11
So, after having driven more than 3,000 km in my Leaf, I have decided that my guess-o-meter (GOM) is consistently optimistic. I've been relatively scientific about this process. I take a photo of my GOM when I start the car and reset the trip meter. After my trip, I check the actual km travelled vs. the km lost on my GOM. To date, I have not experienced even one trip where my actual km was more than the km lost on my GOM.
Does anyone else have this same experience?
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Post by Phoebe on Sept 27, 2016 16:43:11 GMT 11
That is normal. The only time that doesn't happen is if your latest trip is much slower or much less steep (or in some other way consumes very much less power) than the one before. The GOM is not an absolute measurement but rather an approximation based on what you did before as far as power needed for distance travelled.
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Post by EVangelist on Sept 28, 2016 0:34:29 GMT 11
So, after having driven more than 3,000 km in my Leaf, I have decided that my guess-o-meter (GOM) is consistently optimistic. I've been relatively scientific about this process. I take a photo of my GOM when I start the car and reset the trip meter. After my trip, I check the actual km travelled vs. the km lost on my GOM. To date, I have not experienced even one trip where my actual km was more than the km lost on my GOM. Does anyone else have this same experience? Hi craggies - I hope you are enjoying your Leaf! The GOM... what can I say. I suggest you check out my thread here covering the stats of my first 6 months including detailed GOM chart. My conclusion: The last chart is the GOM vs actual distance travelled. This one I have to collect the data manually since the GOM and tripmeter values are not sent to Carwings. The GOM continues to overestimate our actual driving range by more than 25%. This would have to be one of the very few things that disappoints me about the Leaf. I am sure it would be possible to engineer a much better GOM, but not on this model. I am not collecting any further GOM data, it is what it is, so this is the last time you'll see this chart.
So yep... others have this experience. |
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Post by jake on Sept 28, 2016 1:59:15 GMT 11
Yep the GOM is stupidly optimistic, but I find the closer it gets to 0 the more accurate it gets. I find I can rely on it for the last 30km.
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craggles
EV Enthusiast
Posts: 18
LEAF OWNER?: Yes
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Post by craggles on Sept 28, 2016 15:39:55 GMT 11
Thanks for the replies. Glad to see it's not just my car that does this. Yesterday, the GOM lost 91km for 45km travelled. That was the worst! I wonder whether Nissan might give some thought to the psychological impact of an optimistic GOM? I find that I just can't trust it. My wife went for a 110km roundtrip to a friends place a few weeks back. I assured her that it would make the distance, but made sure she took the cable and an extension lead just in case she needed a top up from her friend. She got quite upset when she got to her destination with only 27km remaining on the GOM, after driving on ECO. She wasn't pleased at all and has stated flatly that she won't drive it anywhere that is more than 20km away.
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Post by rusdy on Sept 28, 2016 18:49:32 GMT 11
I find that I just can't trust it ... She wasn't pleased at all and has stated flatly that she won't drive it anywhere that is more than 20km away. I hope you can convince your wife that the Leaf is not that bad. It is guaranteed to give 60km of range regardless how she abuse it when 80% charged (she doesn't drive it on track right?  ). These days I never use the GOM anymore. It has consistently giving me range of 80-ish km for 80% charged for city driving (the GOM would've said 100-ish km in the beginning of the journey). In winter, I'd expect to drop this range to a mere 60km due to the climate control. To complicate the matter, I lost around 10-ish km of range per year. Oh, how I wish someone can give me the aftermarket update on the software, so that it displays me kWh left, and range prediction based on 0.12kwh/km ... 0.16kwh/km (in short, the GOM should've give 2 values). |
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Post by EVangelist on Sept 29, 2016 0:56:34 GMT 11
Yesterday, the GOM lost 91km for 45km travelled. That was the worst! I find that I just can't trust it. My wife went for a 110km roundtrip to a friends place a few weeks back. I assured her that it would make the distance, but made sure she took the cable and an extension lead just in case she needed a top up from her friend. She got quite upset when she got to her destination with only 27km remaining on the GOM, after driving on ECO. She wasn't pleased at all and has stated flatly that she won't drive it anywhere that is more than 20km away. I just rely on how many battery bars are left - much more reliable. Mind you it takes many months of driving to get a good feel for how far that will take you. A 110km round trip is fairly "courageous" even in a new Leaf, certainly if the trip is even a little bit hilly. But also you need to not be tricked if the destination is much higher up than the departure point - even 100-200m elevation difference is significant. Your GOM will be decimated on the trip there, and barely move on the trip back. How many battery bars did you lose going there, and how many were remaining? I recommend using the trip planner on Carwings - I have found it to be quite accurate, within 1 battery bar, and takes into account the elevation profile of the trip. If you ever go on a return trip of more than about 80km I strongly recommend you use it to avoid worry and grief. My longest day trip was 132km return, you can read all about it here. I was quite apprehensive prior, but in the end I had nothing to worry about with a top-up at the destination. You'll get into the groove on all this with more months of driving. |
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Post by jake on Sept 29, 2016 2:01:10 GMT 11
I'd agree on using the trip planner. It is an excellent tool and you can set up things like temperature and driving style which ends up giving you very accurate power usage. I used it to plan a trip to the Tulip festival in the Dandenongs about 86 km round trip. The trip planner said 6 bars to get there. 4 bars to get back. It was bang on and I still had 35 km left on the GOM when I got back.
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Sept 30, 2016 8:17:12 GMT 11
That's one good thing about the BMW i3. The range left takes contours into consideration when entering a destination. This is a good page for range estimates including contours www.jurassictest.ch/GR/ |
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Post by 4wardthinking on Sept 30, 2016 22:04:14 GMT 11
You can get quite a distance on zero bars left.
I'm guessing it's a reserve, much like the 100% charge, which is only 10% more than the 80% charge.
Like it has been said, the pack has 24kwh, which a higher percentage is useable normally.
Simply run 10% off top and bottom, then only 80% is for propulsion, 10% is the regen space, another is reserve.
I still have to completely exhaust the battery as yet, and meter the in-feed quantity though. Should be interesting to see the final module voltage at shut-down. The maximum is 4.11v by the looks of it as it ceases charging. 4.1v being max for the chemistry in use.
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