Stoaty
Posts: 4490
Joined: Fri Jun 18, 2010 9:50 pm
Delivery Date: 12 Jun 2011
Leaf Number: 3871
Location: West Los Angeles

Re: *NEW* Dash Display for Leaf

Tue Jun 18, 2013 6:22 am

GregH wrote:Not sure what to make of the temperature discrepancy.. I should hope I could handle 32+1.8x!!
Page 1 shows the max, but also graphs the relative temps of all 4 relative to max. Page 2 shows all 4 temps in Celsius.. Also note the LeafDD shows temps down to 0.1 degrees Celsius. If the android app is just taking the raw data from the car it's only 1 degree Celsius resolution.. That probably accounts for the difference. LeafDD interpolates tenths of a degree based on the raw thermistor A/D values.
If the android app was just taking raw data so that there was one degree Celsius resolution, the temperatures would always change in steps of 1.8 degrees F. In fact, the app changes in increments of 0.2 degrees F. Must be something else to explain the difference. We will have to get Turbo3 to chime in here.

PS Love the LeafDD!!! Thanks for making it available. :D
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Stanton
Posts: 2280
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
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Re: *NEW* Dash Display for Leaf

Tue Jun 18, 2013 7:57 am

GregH wrote:I'd recommend starting with raw Gids.. We know LBW is 50->49 and VLBW is 25->24.. I wouldn't count on having anything under 5 Gids but YMMV. Honestly if you're under 25 Gids you're probably better off watching the little battery voltage dot.. As long as its not pegged on the right (330V) you've still got a little juice left. I get nervous when I get down to 345V. The true SOC is fun to watch but I don't know really where the bottom is.. Same for Ah*SOC. None of the energy display options on LeafDD will get down to zero... In all cases the car will be dead before then. When you get down to single digits on Gids you might even be better off on the 3rd page where you can see the lowest cell voltage..
I used your methodology and found it helpful:
1) I start w/SOC (for some reason I just like watching it go up and down)
2) I kept an eye on the voltage "dot" and checked actual value on Pg2 once I hit LBW
3) I flipped to Pg3 to check the lowest cell voltage(s) when I got really low
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GregH
Posts: 860
Joined: Fri Jul 01, 2011 4:16 pm
Delivery Date: 13 Jun 2011
Leaf Number: 26967
Location: Irvine, CA

Re: *NEW* Dash Display for Leaf

Tue Jun 18, 2013 9:21 am

Stoaty wrote:
GregH wrote:Not sure what to make of the temperature discrepancy.. I should hope I could handle 32+1.8x!!
Page 1 shows the max, but also graphs the relative temps of all 4 relative to max. Page 2 shows all 4 temps in Celsius.. Also note the LeafDD shows temps down to 0.1 degrees Celsius. If the android app is just taking the raw data from the car it's only 1 degree Celsius resolution.. That probably accounts for the difference. LeafDD interpolates tenths of a degree based on the raw thermistor A/D values.
If the android app was just taking raw data so that there was one degree Celsius resolution, the temperatures would always change in steps of 1.8 degrees F. In fact, the app changes in increments of 0.2 degrees F. Must be something else to explain the difference. We will have to get Turbo3 to chime in here.

PS Love the LeafDD!!! Thanks for making it available. :D
Thanks! As for the temperature software... As I get more data points I've been refining it to make sure when LeafDD rolls over from say 21.9 to 22.0 or from 17.0 to 16.9 that the non decimal component matches what the car is reporting. I've been updating the original post in the thread:
http://www.mynissanleaf.com/viewtopic.php?f=44&t=11676
As I get new data.. If the non decimal component of the LeafDD's value does not match the car's then on Page 2 it'll have a little + or - next to the temperature... holding the button down reveals the raw thermistor values. So for example if the LeafDD is calculating 45.9C but the car is reporting 46C then page 1 will still say 45.9, but on page 2 it'll say 45.9+. If you see a + or - please let me know the raw values so I can update the software! I think it's accurate to within 0.1 degrees from about 12 to 44 degrees or so. After that it's probably off no more than 0.1 or 0.2 degrees Celsius.
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dgpcolorado
Posts: 3178
Joined: Sat Aug 20, 2011 1:56 pm
Delivery Date: 15 Dec 2011
Location: The Western Slope, Colorado

Re: *NEW* Dash Display for Leaf

Tue Jun 18, 2013 6:16 pm

Received my Leaf DD today. Image
I decided to mount it over the console and made a mount for it that is Velcroed to the dash. Thought about using metal but figured it would get too hot so I used cardboard instead: white on the front and black on the back for better viewing contrast:
Image
The idea is for it to act as a sunshade for the device as well as a holder and viewing backdrop.

Image
(The unevenness of the display brightness is an artifact of the display/camera interaction.)

I was disappointed, but not surprised, to find my battery "health" at 93.39. I've known that my range was reduced since last winter. (Sure would be nice if there were public charge stations around here. Oh well.)

Sure is nice to be able to track battery temperature and the energy needed for various trips. I found that a trip from town to the top of my mesa takes 33 GID at 77-80ºF temperatures; I'll be interested to see what it is at 20ºF.

It is also nice to see regen adding charge to the battery and watch the SOC% going up. One concern is that one of my battery cells, #48, is consistently lower in voltage than the others.
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Stanton
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Leaf Number: 7458
Location: Plano, TX
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Re: *NEW* Dash Display for Leaf

Tue Jun 18, 2013 6:22 pm

dgpcolorado wrote:Received my Leaf DD today. Image
I decided to mount it over the console and made a mount for it that is Velcroed to the dash. Thought about using metal but figured it would get too hot so I used cardboard instead: white on the front and black on the back for better viewing contrast
You beat me to it: I ended mounting mine about the same spot, except I placed the velcro directly on the bottom of the LeafDD case and the top (chrome) plastic of the console. It's so light it stays put. However, it will probably spend most of it's time stored away inside the steering wheel to protect it from heat and theft (see earlier post).
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Last edited by Stanton on Thu Jun 20, 2013 11:18 am, edited 1 time in total.
2011 Blue Ocean SV w/floor mats & window tint
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Battery Pack replaced (Rev E) @51 months and 41k miles

lion
Posts: 557
Joined: Fri Apr 19, 2013 12:23 pm
Delivery Date: 22 May 2013

Re: *NEW* Dash Display for Leaf

Wed Jun 19, 2013 5:02 am

I looked at my 13's steering wheel column, and only have a hole the size of a dime or so there. Did you make that hole bigger, or did they change it in the 2013MY?

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Stanton
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Re: *NEW* Dash Display for Leaf

Wed Jun 19, 2013 6:43 am

lion wrote:I looked at my 13's steering wheel column, and only have a hole the size of a dime or so there. Did you make that hole bigger, or did they change it in the 2013MY?
They must have changed the 2013's, because I definitely didn't make that "hole" bigger! It's larger than a silver dollar :o
2011 Blue Ocean SV w/floor mats & window tint
Lithium Pros 12v LiFePO4 battery w/Antigravity Battery Tracker
FIAMM 74100 horns
Wet Okole seat covers
Tor's low-power heater mod
2013 sun visor
Battery Pack replaced (Rev E) @51 months and 41k miles

GregH
Posts: 860
Joined: Fri Jul 01, 2011 4:16 pm
Delivery Date: 13 Jun 2011
Leaf Number: 26967
Location: Irvine, CA

Re: *NEW* Dash Display for Leaf

Wed Jun 19, 2013 4:50 pm

So last night I took my car down to 8 Gids just to see how things looked on LeafDD.. The last 10 Gids or so was burned off in the garage with the heater on. I probably should have taken it down to turtle but I was getting impatient and maybe a little nervous.

Here's how it stacked up down at 13 Gids.. At this point the Voltage dot on page 1 was bumping up against the right edge of the display (334V).
Note SOC 8.5371% and Vcell delta (3.558-3.343) = 215mV
Image
Image

And down even lower at 8 Gids.. At this point the Voltage dot was pinned (pack voltage 322V!!)
Note SOC 6.3168% and Vcell delta (3.462-3.164) = 298mV!!
Image
Image

It probably could have gone a bit lower, but at this point the voltages are dropping like rocks and the spread Vmin to Vmax was getting crazy.
Pretty consistently now my lowest cell at low SOCs is cell#1.. the module right next to the BMS.. The BMS that gets warm during cell balancing.. hmmm.
'17 blue Volt Premier w/ACC
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garygid
Gold Member
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Delivery Date: 29 Mar 2011
Leaf Number: 000855
Location: Laguna Hills, Orange Co, CA

Re: *NEW* LeafDD - Dash Display for Leaf

Thu Jun 20, 2013 7:36 am

Looks like your cell #1 might qualify for replacement, or at least
an evaluation, if the cells are well balanced at the top end.

Perhaps some auto-scaling of the wide-range cell voltages would be helpful?

Splendid that you are doing so much with that compact device. :D
See SOC/GID-Meter and CAN-Do Info
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dgpcolorado
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Re: *NEW* LeafDD - Dash Display for Leaf

Sun Jun 30, 2013 9:47 am

I think I've mentioned it before but my cell-pair 48 is consistently low. Yesterday I noticed that it got even lower in voltage than the others when I neared LBW. This picture was taken this morning at 67 Gid, but it was much the same at the low of 54 Gid (I charged a few minutes to get the battery back over 20%):
Image
Cell-pair 48 was fluctuating between about 3.799 and 3.794 Volts, well below the others.

My concern is that if I get down in the VLBW range the low cell-pair might trigger a turtle or early shutdown because of the low voltage. Might be time to take the car to the dealer, but it seems likely that the LEAF tech there probably hasn't dropped or split any battery packs. (As of January they had sold about a half dozen LEAFs, so it isn't a high volume dealer like so many of you have.)

Any ideas about whether this is something to be worried about?

By the way, anyone know where cell-pair 48 is located? I presume that if they replace it they would just do the whole can with four cells in it, right?
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