LeafDD - Dash Display for Leaf

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lorenfb said:
jjeff said:
^^^ interesting, I haven't noticed that. How hard and for how long do you have to push on the accelerator to get that number to appear? Also how long does it display after it appears? I take it a higher internal resistance is worse than a lower one, what is a typical number and what number might mean a battery is getting weaker? My '12 is down to 9 bars and only has a capacity of 47 and Hx around 51, I'd imagine it's internal resistance would be quite a bit higher than a Leaf with a good battery.

1. It takes about 10 seconds for it to sample the data.
2. It stays as long as you stay on that screen. Once the screen is changed, It will not be shown the next time that screen is displayed.
3. Yes, just like a lead-acid battery, a higher the resistance indicates aging and more heat developing as a function of load or charging.
4. The output resistance does change over time. I'll post my data taken over the last 3 years later today.

Here are the battery resistance data:

11/20/14 -13,700 miles, 76 mohms per LeafDD, 20 Deg, 73% SOC
11/27 -13,800 miles, 67 mohms per LeafDD, 25 deg, 63% SOC
11/30 - 13,900 miles, 56 mohms per LeafDD, 27 deg, 71% SOC
12/2 - 14.100 miles, 55 mohms per LeafDD, 28 deg, 67% SOC
12/16 - 14,500 miles, 89 mohms per LeafDD, 15 deg, 93% SOC
12/27/14 - 14,800 miles, 103 mohms per LeafDD, 11 deg, 24% SOC
3/10/15 - 17,400 miles, 60 mohms per LeafDD, 30 deg, 73% SOC
3/14 - 17, 550 miles, 56 mohms per LeafDD, 32 deg, 47% SOC
4/14 - 19,100 miles, 59 mohms per LeafDD, 25 deg. 38% SOC
5/4 - 19,989 miles, 64 mohms per LeafDD, 24 deg. 48% SOC
5/15 - 20,400 miles, 73 mohms per LeafDD, 20 deg. 41% SOC
5/22 - 20,700 miles, 58 mohms per LeafDD, 28 deg. 50% SOC
12/10/15 - 28,000 miles, 90 mohms per LeafDD, 19 deg. 92% SOC
4/5/16 - 32,000 miles, 74 mohms per LeafDD, 24 deg, 55% SOC
5/16 - 33,700 miles,89 mohms per LeafDD, 22 deg, 47% SOC
5/16 - 33.700 miles, 58 mohms per LeafDD, 31 deg, 76% SOC
10/5 - 39,300 miles, 100 mohms per LeafDD, 22 deg, 50% SOC
10/6 - 39,400 miles, 61 mohms per LeafDD, 30 deg, 51% SOC
10/7 - 39,500 miles, 80 mohms per LeafDD, 25 deg, 56% SOC
10/15 - 40,000 miles, 71 mohms per LeafDD, 27 deg, 45% SOC
10/30 - 41,000 miles, 74 mohms per LeafDD, 23 deg, 66% SOC
12/26/16 - 43,000 miles, 110 mohms per LeafDD, 13 deg, 77% SOC
6/10/17 - 49,600 miles, 89 mohms per LeafDD, 19 deg, 70% SOC
7/1/17 - 51,000 miles, 62 mohms per LeafDD, 33 deg, 44% SOC
8/15/17 - 53,400 miles, 61 mohms per LeafDD, 35 deg, 57% SOC

Once these are graphed (someday), a family of curves will result with;
Y axis being resistance, X axis being temperature, with each stacked curve being an aging point in time with a negative
temperature slope.
 
I didn't expect/know that the battery resistance data would vary so widely; I thought it would simply rise with age/degradation?
I assume those temps are Fahrenheit (Celsius would be too hot)?
 
Stanton said:
I didn't expect/know that the battery resistance data would vary so widely; I thought it would simply rise with age/degradation?
I assume those temps are Fahrenheit (Celsius would be too hot)?

Those are degrees centigrade. The hottest was 35C (95F).
 
Stanton said:
I didn't expect/know that the battery resistance data would vary so widely; I thought it would simply rise with age/degradation?
I assume those temps are Fahrenheit (Celsius would be too hot)?
Resistance correlates with temperature - a cold battery has higher resistance, which is why you lose range: energy is lost to internal resistance which results in the battery warming itself up. So it is, thankfully, a self-correcting condition... at the expense of energy.

That is also to say, outside temperature isn't the only thing affecting range. The outside temperature could be 0C/32F and if you're on a road trip with a battery plenty warmed up (in the 90F range or so), you'll still get improved mileage as you continue driving. The air resistance, though, does still increase in cold temperatures - so it takes more energy to push through the air - but it's more like driving at 55F with a warm battery at 32F. ;)

Yeah, driving a Leaf on road trips can be a bit of an exercise in engineering knowledge... but generally, fuzzy math and rough calculations can do you well, especially given the number of variables involved. :ugeek:
 
Does anyone have contact information for GregH?

The LeafDD is a great solution for showing percentage of battery remaining in a very simple format on the 2011 - 2012 Leafs since they do not show percentage of battery remaining on the HUD.
 
smileyscout said:
Does anyone have contact information for GregH?

The LeafDD is a great solution for showing percentage of battery remaining in a very simple format on the 2011 - 2012 Leafs since they do not show percentage of battery remaining on the HUD.
Sorry, I don't have contact info but I agree about the LeafDD, you'd have to "pry mine out of my cold dead hands" before I'd pull mine out of my '12 Leaf :lol:
Sure LeafSpy and a smartphone do what the LeafDD does and more but I personally prefer a standalone device I never really have to touch, just works!
 
Unfortunately, the only way to acquire a LeafDD is this forum and this thread: Greg was clear that this wasn't a long-term biz venture. He did a great job on the product (I was one of the beta testers), offered a firmware update to help with the new TCU compatibility (see earlier in this thread)...and did all that for little to no profit. I have the code for the last firmware update, but don't have information on the programmer that was being passed around to flash it.
 
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