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TonyWilliams
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Re: SOC data: 281-based, New-Bars

Tue Jul 26, 2011 4:33 pm

garygid wrote:The real question is how much usable energy YOUR car's battery
has after its LBW, not how much energy the average LEAF had.

I suspect (do not know) that there is significant variation in the "low end"
energy, depending primarily upon the condition of the specific battery, what
Nissan's "SOC" reports, and how the LEAF uses that (and other) information.

And why gathering data helps to figure those things out, hence the cumulative data of Battery Warning to Turtle.

I'd like to see if the Warnings are indeed at data points 48/49 and 24/25 for all cars. And if a coherent ratio of data can be used to somewhat accurately say that if I drive 10 miles with LowBatteryWarning, then I will most likely be able to drive an additional 60% of that number at the same speed/conditions, or 6 miles, until I hit turtle.

Not even a tiny percentage of people will intentionally drive their cars to turtle to determine what their specific car might do, and even if they did, they are too many variables for that single data point to be accurate at, perhaps, years down the road when they REALLY need it.

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garygid
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Re: SOC data: 281-based, New-Bars

Tue Jul 26, 2011 9:17 pm

In turbo2ltr's early work on the EV-CAN buss, I believe he determined that the Bars, Battery Warnings, and Turtle "events" were tied to the "broadcast" SOC value. He did this, as I recall, by sending his own messages TO the EV-CAN buss, and observing the "events" on the LEAF's dashboard.

Of course, I might have not understood properly, or have forgotten.

Apparently the VCM translates SOC levels to Display-Bars, since it was only (we think) the VCM's firmware that was re-written by the "A/C Fix" April 2011 Update.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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garygid
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Re: SOC data: 281-based, New-Bars

Sun Jul 31, 2011 5:48 pm

I charged "Maple" LEAF to 100% overnight (240v, 12A) and the SOC-Meter
indicated 99.7% "SOC" (280 of 281 raw) at noon when I went to drive it.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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rainnw
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Re: SOC data: 281-based, New-Bars

Sun Jul 31, 2011 8:16 pm

evnow wrote:Image

Only a slight bending of the curve.
If these cells were actually charged all the way to 4.21 volts (aka, true 100%), you would see a bend at the start as well. interesting....
Ordered 11/24/2010 (November)
Delivered: 5/28/2011
Red SL-e, ECO package, cargo, splashguards
Commute: 75 miles round trip (60 miles highway, 15 side roads)
miles: 45,000 miles
Charge daily to 100%, lost 1st bar at 43k

http://www.chargesticker.com/" onclick="window.open(this.href);return false;

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garygid
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Re: SOC data: 281-based, New-Bars

Sun Jul 31, 2011 8:51 pm

The SLOPE of the curve is important. The flatter slope represents more miles per bar.

It looks like the slope at 175 (raw) SOC is only half of the slope below 50 SOC. Therefore TWICE as many miles per bar in the middle than at the low-SOC end.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle

Herm
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Re: SOC data: 281-based, New-Bars

Mon Aug 01, 2011 6:38 am

rainnw wrote: If these cells were actually charged all the way to 4.21 volts (aka, true 100%), you would see a bend at the start as well. interesting....
Thats crazy talk, 4.15v is really pushing it.

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garygid
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Re: SOC data: 281-based, New-Bars

Mon Aug 01, 2011 7:37 am

Both of you are just guessing, right?

I have not seen any exact high-end (or low-end) data on these Nissan-produced cells, just guesses based on other Li-ion chemistries.

Different (even quite similar) battery cell micro and macro structures, and the exact chemistries of all of the elements can produce cells with VERY different characteristics.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle

GregH
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Leaf Number: 26967
Location: Irvine, CA

Re: SOC data: 281-based, New-Bars

Mon Aug 01, 2011 8:07 am

Every time I've watched my car charge, the charge terminates at 394V or 394.5V "100%"
(ie 4.10v/cell) even though RAhC has only hit 280 max.. Once I saw it climb to 281 but then while still charging reset back to 280.. Incidentally, "80%" is only 4.05v/cell.

Can someone with logging capabilities generate a graph during charge of pack voltage, current and RAhC?
'17 blue Volt Premier w/ACC
'12 SL black Leaf
'11 SL blue Leaf
RAV4-EV 2002-2005
Gen1 & Gen2 EV1 1997-2003
PV 2.4Kw, 10kWh lithium battery SCE TOU-DA

GregH
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Re: SOC data: 281-based, New-Bars

Mon Aug 01, 2011 9:04 am

PS I think we'll need to dither the current and Vpack... It's got a fast refresh rate but only 0.5A resolution... So for example if it reports 8.0A 80% of the time and 8.5A 20% of the time (within a matter of seconds), I'd take that as 8.1A
'17 blue Volt Premier w/ACC
'12 SL black Leaf
'11 SL blue Leaf
RAV4-EV 2002-2005
Gen1 & Gen2 EV1 1997-2003
PV 2.4Kw, 10kWh lithium battery SCE TOU-DA

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garygid
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Re: SOC data: 281-based, New-Bars

Mon Aug 01, 2011 9:24 am

Try looking at the EV-CAN 6-hour charging Log
(6 million CAN-messages) with the CAN-Do program available at:
www.wwwsite.com/puzzles/cando/

CAN-Do can graph what appears to be the SOC and the Pack Voltage.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle

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