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garygid
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Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

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

Sun Jul 03, 2011 12:11 am

The top Bar certainly has less usable capacity, even though the New-Bars have about 7% each of our "SOC".

I suspect that the SOC is based upon an estimate of no-current battery pack voltage. This voltage will fall more quickly near the top end, and near the bottom end. So, the top Bar and the bottom Bars (hidden New-Bars) will tend to "contain" less usable energy.

Still, different measurements (the individual cell-pair voltages) are probably used to actually Stop Charging at the top end (the highest cell-pair voltage) and Stop Driving (and Turtle Mode?) at the low end (the lowest cell-pair voltage).

A lower "fully-charged" SOC probably indicates a greater mismatch in cell equalization, which also tends to cause "premature" Stop-Driving, at an unexpectedly-high SOC.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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garygid
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Posts: 12464
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Re: SOC data: 281-based, New-Bars

Sun Jul 03, 2011 12:13 am

We have not yet found a way to read the 96 cell-pair voltages, but we have planned a way to discover how to read them.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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

Sun Jul 03, 2011 9:05 am

Have you found out what the total pack voltage is at 100% charge?

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

Sun Jul 03, 2011 9:07 am

Boomer23 wrote:Average mi/kWh efficiency from main dash: 4.0 mi/kWh for this run

Odo miles...Bars...SOC%...SOC#
..0.............12.....99........279
..4.4...........11.....92........257
..9.2...........10.....84........236
..13.9...........9.....78........219
..20.8...........8.....71........199
..25.8...........7.....66........186
..35.1...........6.....58........163
..40.8...........5.....51........143
..Data Missed..4....................
..51.8............3.....36........102
..56.6............2.....31.........88
..61.8............1.....26.........73
Hmmm.

This looks a lot more consistent than the last one. The top bar isn't much different from the rest, even though it is the least efficient. But that can easily be explained by initial AC draw etc.

BTW, kwh/soc-unit = 0.075 this time compared to 0.082 last time. That doesn't sound too consistent ... unlike the SOC units that are no more than 1 unit away from the last time, except for 2 & 7.

Image

Old one for comparison ...

Image
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

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

Sun Jul 03, 2011 9:39 am

Based on the above here is my estimate of the SOC bars with the upgraded firmware ...

Image

This is consistent with our experience that after we hit 0 bars, we can still drive around for 15 to 20 miles (so a 3 kwh usable charge left in the battery looks reasonable).
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

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

Sun Jul 03, 2011 2:43 pm

evnow wrote:This is consistent with our experience that after we hit 0 bars, we can still drive around for 15 to 20 miles (so a 3 kwh usable charge left in the battery looks reasonable).
But Tony's chart shows 10-11 miles left at zero bars, and that's at 38mph. With one bar (and low battery warning) it was 22 miles at 38mph. So we need to change the chart now?
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

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

Sun Jul 03, 2011 4:56 pm

LEAFfan wrote:But Tony's chart shows 10-11 miles left at zero bars, and that's at 38mph. With one bar (and low battery warning) it was 22 miles at 38mph. So we need to change the chart now?
Tony's bar says you get 16 miles after battery low. I got battery low & zero bars before and after an off-on event.

I think battery low is a better indicator of charge remaining at low charge than # of bars (i.e. 0 or 1). In the SOC chart above 1% and below are my extrapolations. boomer reported till 2 bars.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
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GregH
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Leaf Number: 26967
Location: Irvine, CA

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

Mon Jul 04, 2011 1:44 pm

Wow! Nice work guys!
This is my first post here... I've ordered a laptop based CAN analyzer but it hasn't arrived yet so I modified one of my old dashboard displays from the defunct EDrive PHEV Prius project (128x64 OLED) so I could sneak a peak at 0x5BC on the EV-CAN bus. Very cool.. My Leaf (555 miles on the odo, 3wks old) only goes up to 278 but I suspect that has more to do with the fact that I've only been to "full" about 3 or 4 times so far and less to do with my miles.. I'm guessing most balancing that needs to be done (if any) is done at or near 100% SOC.. So perhaps a few more 100% charge cycles will bump me up to 281... Anyway, looking forward to jumping into the discussion!
-Greg Hanssen, Irvine
'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

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

Mon Jul 04, 2011 1:49 pm

evnow wrote:
LEAFfan wrote:But Tony's chart shows 10-11 miles left at zero bars, and that's at 38mph. With one bar (and low battery warning) it was 22 miles at 38mph. So we need to change the chart now?
Tony's bar says you get 16 miles after battery low. I got battery low & zero bars before and after an off-on event.
No, that's 'Mixed City'. 38mph is 22 miles on Tony's chart.
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

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

Mon Jul 04, 2011 3:35 pm

GregH wrote:Wow! Nice work guys!
This is my first post here...
-Greg Hanssen, Irvine
WELCOME, Greg !!! Nice to see you in the "new" EV generation ! 8-)
2011 Silver SL+QC [Mfg: 11/2010] 36mo/15k LEASE
06Jun2013 Status [28.5 months][34,173 miles][11 bars]
Lost CapacityBar 6/6/13 @34,173 miles while in LEAF Battery Monitor: 83.41%, 71.4F (avg); cool overnight;

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