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garygid
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SOC data: 281-based, New-Bars

Mon Jun 27, 2011 1:36 am

Now that we have some working hardware for displaying the SOC (as a percentage, using 281 as 100%) as we drive, post and discuss the data readings here.

ONLY data for the LEAFs with the updated firmware, where the "fuel" indicator "bars" are affectionately called "New-Bars".

Comparisons to Old-Bars may be made if helpful to the new-Bars discussion, but clearly distinguish the Old-Bars data.

I think my Old-Bars SOC read 98.9 after charging to 100% overnight. It "should be" the same SOC for old-Bars and new-Bars.

Also, we "think" that the SOC for Low Battery warning, Very Low Battery Warning, and Turtle Mode should be the same for both the "original" and "updated" LEAF firmware.

It is currently presumed that only the SOC values that trigger the Bar-On and Bar-Off display changes are now different, with each Bar now representing a bit less capacity. So, now there is apparently a "hidden" reserve, after all the Bars disappear, that you can no longer see.

The SOC-Meter gives us some way of examining that "hidden" capacity. If we CANNOT use it, we have effectively "lost" that capacity.
See SOC/GID-Meter and CAN-Do Info
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garygid
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 1:52 am

For those that want to record the SOC when bars are gained or lost, we now have 3-buss CAN message recorder to capture all the data during charging, discharging, or driving.

It requires a PC with Windows to run our CAN-Do program and our 3-port CAN-Capture hardware.

This hardware costs about $250 plus tax and shipping, and requires adding 3 end connectors to one OBD cable. See the "AVR-CAN hardware for CAN-data Capture" thread for more details.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
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Boomer23
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 10:31 am

I have one of the early hardware/software setups from Gary's group so that we can do some testing on a car that has the Nissan firmware update, i.e. displays "new bars" on its dash.

I did some testing down near the bottom of the SOC range.

Bars..Percent SOC...miles showing...warnings
..2......29%.............19.................none
..1......22%.............13.................none
..1......17%.............8 (flashing)....Low battery
..0........8%.............3 (flashing)...zero bars showing
..0.....8% ~7%.........---..............Very Low battery (reading was 8% when VLB warning appeared, but reading changed to 7% almost immediately)

LEAF parked and turned off in garage, connected to charge at L2....5% SOC display.

Miles/kWh display on the LEAF main dashboard was 3.7 for this driving period.

Full recharge to 100% took 24.1 kWh measured by TED. (Note that TED showed 26.1 kWh for full charge after I took this car to "turtle" mode once. Perhaps we can use the 5% display and the 2kWh differential for charging to infer battery capacity?)

SOC display with 100% charge and 12 bars on dash was 100%, SOC "number" 281.
Last edited by Boomer23 on Mon Jun 27, 2011 4:08 pm, edited 2 times in total.
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MikeD
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 10:58 am

Am I correct in assuming that this SOC gauge will also allow one to detect the minute loss of battery pack capacity over time? How about eventually the SOC for each of the 48 modules (or possibly finer) constituting the battery pack, which might allow one to detect a defective module whose SOC is significantly less than the others?

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Boomer23
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 3:51 pm

New report on a freeway drive today, total distance 58.9 miles, ran the "tank" down to 2 bars. I ran at normal freeway speeds, sometimes up to 74 mph, got on and off the freeway for safe data recording at times, up and down some hills, A/C on the whole time, ambient temps around 74 F. I took SOC readings immediately as the bars dropped to the indicated bar level.

Main dash energy economy for this trip = 3.5 mi/kWh

Odo miles...Bars...SOC%...SOC #...Guessometer miles
....0...........12.....100%.....280........102
...3.3..........11.....92%......257........92
...9.3..........10.....84%......237........68
...14.4..........9.....78%......220........67
...23.0..........8.....71%......199........68
...27.2..........7.....64%......180........50
...31.7..........6.....57%......162........47
...39.0..........5.....51%......141........43
...43.0..........4.....44%......123........30
...49.1..........3.....36%......103........23
...57.3..........2.....29%.......83.........19
Car Parked, trip end
...58.9..........2.....26%.......74..........15

Edit: After several hours of sitting,

...58.9...........1....25%.......70..........14
Last edited by Boomer23 on Mon Jun 27, 2011 9:26 pm, edited 2 times in total.
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TonyWilliams
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 6:01 pm

Bars...SOC%...SOC #...Units burned
12.....100%.....280........N/A
11......92%......257........23
10......84%......237........20
..9......78%......220........17
..8......71%......199........21
..7......64%......180........19
..6......57%......162........18
..5......51%......141........21
..4......44%......123........18
..3......36%......103........20
..2......29%.......83.........20
Guess...
..1......20%.......55.........28
..0......10%.......28.........28

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

Mon Jun 27, 2011 6:21 pm

Boomer23 wrote:Main dash energy economy for this trip = 3.5 mi/kWh

Odo miles...Bars...SOC%...SOC #...Guessometer miles
....0...........12.....100%.....280........102
...
...58.9..........2.....26%.......74..........15
Cool.

KWh used = 58.9/3.5 = 16.8 Kwh
KWh / SOC Unit = 16.8/(280-74) = 0.082
100% SOC = 22.87 KWh.
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mwalsh
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 6:24 pm

evnow wrote:100% SOC = 22.87 KWh.
.....on the new firmware.
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Re: SOC data: 281-based, New-Bars

Mon Jun 27, 2011 6:42 pm

mwalsh wrote:
evnow wrote:100% SOC = 22.87 KWh.
.....on the new firmware.
.....if you can trust the miles per KWh display to be accurate. Plus, even if it is, what if they round it? The real number could be anywhere from 3.45 to 3.54 giving capacity numbers ranging from 23.21KW to 22.62KW. So what exactly do we know? :D

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

Mon Jun 27, 2011 6:52 pm

Boomer23 wrote:Main dash energy economy for this trip = 3.5 mi/kWh

Odo miles...Bars...SOC%...SOC #...Guessometer miles
....0...........12.....100%.....280........102
...3.3..........11.....92%......257........92
...9.3..........10.....84%......237........68
...14.4..........9.....78%......220........67
...
...58.9..........2.....26%.......74..........15
There is something wrong with the 12th bar.

12th to 11th bar : 3.3 miles for 23 SOC units or 1.8 m/kwh.
11th to 10th bar : 6.0 miles for 20 SOC units or 3.7 m/kwh.
10th to 9th bar : 5.1 miles for 17 SOC units or 3.7 m/kwh.
etc
etc

So, looks like that 280 number goes down rather fast in the first few miles.

Why ?
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