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

Sun Feb 20, 2011 9:49 pm

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

Do you mean the wild swings in Range ... ?


Yes - wild swings in projected range. If the SOC reports are really accurate, then probably a better way for an experienced driver to figure out how much further the car can go then the projected range. Otherwise - if there is also information about how much power the motor is using (which may be something that is sensored in the car) would be another way. On a lot of hybrids - the power flow in and out of the pack is something there are sensors for. Assume the Leaf is the same, ....

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

Sun Feb 20, 2011 10:30 pm

The NAV displays energy usage information, but Coulomb counting (keeping track of of energy in and out of the pack) is no easy task. Besides, the BMS is already doing it to come up with the SOC so there's no reason to do it yourself. SOC is the 'holy grail" of the pack. There is nothing we could do better than the BMS is already doing to come up with the SOC.

The range varies not because of the SOC, but because the VMC is predicting range based on 1: the SOC and 2: your previous consumption rate (which is dictated by your driving conditions). So while the range may be swinging, the SOC is more of a true measure of capacity remaining. For some people this number would better give them a more consistent value to base range on instead of trying to "reverse engineer" what the VMC is trying to predict.
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garygid
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 10:34 pm

Does the miles per kWh "meter" (on one of the "Nav" screen displays)
show essentially a real-time value, or just a long-term average that is
essentially useless for maximizing for the "present" driving conditions?
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
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turbo2ltr
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 10:41 pm

evnow wrote:Cool. Can you also checkout the charging side (i'm less sure of that).


I don't see why it would be different other than the hysteresis that's built into the gauge. But I can check it out once I add filtering and logging to my custom program or the file would be HUGE. I can't charge it nearly as fast as I can discharge it so I'd have to leave it logging for several hours.
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garygid
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Re: What SOC% does each bar on Leaf dash represent ?

Sun Feb 20, 2011 10:56 pm

The first QC in AZ might be helpful?
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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

Sun Feb 20, 2011 11:11 pm

OK - trying to understand some of the inner workings a bit more.

So have you been able to figure out - when the car takes a particular action - e.g. going into turtle mode - does it do it based on the actual SOC number, or based on the projected range number?

The later would seem to explain some of the outlier reports we've read, but it also seems to be a strange way to take action.

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

Wed Feb 23, 2011 11:15 pm

Tonight I went down to 1.9% SOC.

My math was slightly off due to a full scale error. Two days in a row the car was charged to what I now calculate as 100.0%.


Bar 12 turned off at 92.6%
Bar 11 turned off at 84.3%
Bar 10 turned off at 76.5%
Bar 9 turned off at 68.3%
Bar 8 turned off at 60.4%
Bar 7 turned off at 52.2%
Bar 6 turned off at 44.4%
Bar 5 turned off at 30.2%
Bar 4 turned off at 28.4%
Bar 3 turned off at 20.1%
Bar 2 turned off at 12.3%
Bar 1 turned off at 4.1%

There seems to be an anomaly with when bar 5 turned off. Gonna have to check that one again. It wasn't done in one trip so maybe I screwed something up.

I'm currently logging a 1% to 100% charge and will report back. I can tell you the first bar comes on at 8.2%
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garygid
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Re: What SOC% does each bar on Leaf dash represent ?

Wed Feb 23, 2011 11:29 pm

Looks like your SOC-Bar numbers are matching those in the first post (from the Service Manual, I think).

Soon we will be able to have a real SOC meter, I hope.
Great Work!
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, sold in 2015
2010 Prius, 2014 silver Tesla S
Nissan EVSE, mod to 240/120v 16A
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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

Thu Feb 24, 2011 9:18 am

Here's what was logged while charging.

Bar 1 turned on at 8.1%
Bar 2 turned on at 16.2%
Bar 3 turned on at 24.7%
Bar 4 turned on at 32.8%
Bar 5 turned on at 41.0%
Bar 6 turned on at 49.4%
Bar 7 turned on at 57.6%
Bar 8 turned on at 65.7%
Bar 9 turned on at 73.8%
Bar 10 turned on at 81.9%
Bar 11 turned on at 90.4%
Bar 12 turned on at 98.5%
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Glenn
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Re: What SOC% does each bar on Leaf dash represent ?

Thu Feb 24, 2011 10:34 am

turbo2ltr wrote:Here's what was logged while charging.

Bar 1 turned on at 8.1%
Bar 2 turned on at 16.2%
Bar 3 turned on at 24.7%
Bar 4 turned on at 32.8%
Bar 5 turned on at 41.0%
Bar 6 turned on at 49.4%
Bar 7 turned on at 57.6%
Bar 8 turned on at 65.7%
Bar 9 turned on at 73.8%
Bar 10 turned on at 81.9%
Bar 11 turned on at 90.4%
Bar 12 turned on at 98.5%

So, while the majority of us here do agree that an SOC meter would be far more valuable as an "am I gonna get home" gauge, perhaps we can at least look at the bar-o-meter like this, (he said, trying to put a positive spin on it):

Hop in your ICE'er in the morning, see the fuel level meter is pointing to about 5:00, think "dang, I'd better stop by the local petrol pump on my way to work."

Jump in your spiffy new LEAF, see just a couple of bars lit up, think "dang, I'd better plug this puppy in for a while and go back to bed."

Sure seems to me like it occupies a lot of dashboard real estate and Nissan sales hype for such a limited amount of (useful) information.

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