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evnow
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What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 1:23 pm

Update : This SOC% corresponding to various bars in the Leaf dash is with the new firmware - based on this thread.

Image

From various discussion in this thread, I've made a spread sheet that shows what lit bars showing available battery charge i.e. SOC (state of charge) really mean. When certain # is bars are lit, it doesn't mean a particualr SOC %, but a range. The range of SOC % that lit bars represent change depending on whether the car is being charged or being driven (i.e. discharged.)

Note : The below SOC% corresponding to various bars in the Leaf dash is with the old firmware.

The actual capacity shown is rounded up and assumes usable battery capacity of 24kwh. Carwings is an estimate - needs to be confirmed. Post here if you can confirm any of the carwings numbers.

Image

The following images are from the user manual, thanks to AndyH.

Image

Image

12 - Driving Range Display
13 - Battery Available Charge Gauge (Fuel Gauge)
14 - Battery Capacity Level Gauge (Battery Condition/Total Capacity Gauge)
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stanley
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Re: What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 1:28 pm

Great chart!! thank you

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EVDRIVER
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Re: What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 1:33 pm

An 8% variance could be eight miles or more depending, not exactly a useful scale. If one was not watching and the bar just shifted one would not know if the bar were about to go down any minute or had just gone down making the estimation even more difficult. This to me is not enough information and further shows how the addition of a 0-100% SOC would have been more useful on many levels, one knows were the level is exactly and can see small changes in real time which can be quite useful. I bet even the average consumer will soon catch on to this in many cases.

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evnow
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Re: What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 1:44 pm

EVDRIVER wrote:This to me is not enough information and further shows how the addition of a 0-100% SOC would have been more useful on many levels, one knows were the level is exactly and can see small changes in real time which can be quite useful. I bet even the average consumer will soon catch on to this in many cases.

I don't think there is much debate about whether SOC% would be better than big grain bars. No doubt knowing SOC as best as BMS knows it is good. But my argument is that, that should not replace the range shown. The algo to calculate range should become better.
1st Leaf : 2/28/2011 to 5/6/2013
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EVDRIVER
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Re: What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 2:05 pm

evnow wrote:
EVDRIVER wrote:This to me is not enough information and further shows how the addition of a 0-100% SOC would have been more useful on many levels, one knows were the level is exactly and can see small changes in real time which can be quite useful. I bet even the average consumer will soon catch on to this in many cases.

I don't think there is much debate about whether SOC% would be better than big grain bars. No doubt knowing SOC as best as BMS knows it is good. But my argument is that, that should not replace the range shown. The algo to calculate range should become better.



It has never been easy to do this in an EV as you mention which is why the SOC can be a second and sometimes more accurate tool for the novice. I hope they make some software revision so we can see the SOC/ KW usage on the NAV, much cleaner and easier then adding a display. Perhaps in the corner some place so it is visible on multiple screens.

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mwalsh
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Re: What SOC% does each bar on Leaf dash represent ?

Sat Jan 15, 2011 4:30 pm

Nice!
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AV L2 EVSE.

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turbo2ltr
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 8:23 pm

I went through the log from the highway drive (see viewtopic.php?f=8&t=2794). The 10 mile drive was actually almost 15 miles according to google. It resulted in a 20 meg data file which I just processed..

I started out with a 100% charge and 12 SOC bars. Using the newly found SOC value on the CAN bus, here is what I found:

bar 12 turned off at 92.3%
Bar 11 turned off at 84.4%
Bar 10 turned off at 76.1%

That's all I discharged during this log, but seems to match up very nicely with the evnow's information in the OP. I think it's pretty safe to say the chart is accurate.
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LakeLeaf
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 8:45 pm

Nice work guys!

It would be interesting to learn if the car had any way to measure the amount of power being used by the motor - rather then just the state of charge of the battery. Yes - you would think there is a direct correlation between the two, but with the wild swings in SOC we've seen reported, it would be interesting if there was any data being recorded on the "consumption" side rather then just looking at the "supply side" so that we would have another method for judging how much range is left in the pack.

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evnow
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 9:16 pm

LakeLeaf wrote:... but with the wild swings in SOC we've seen reported....

Do you mean the wild swings in Range ... ?
1st Leaf : 2/28/2011 to 5/6/2013
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evnow
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 9:19 pm

turbo2ltr wrote:bar 12 turned off at 92.3%
Bar 11 turned off at 84.4%
Bar 10 turned off at 76.1%

That's all I discharged during this log, but seems to match up very nicely with the evnow's information in the OP. I think it's pretty safe to say the chart is accurate.

Cool. Can you also checkout the charging side (i'm less sure of that).
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to ?
Volt : 3/25/2017 to ?

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