Oils4AsphaultOnly said:
lorenfb said:
The most accurate method is to just use LeafSpy for all three data points; V0 - before the charge starts, V1 - the voltage when
the charging current begins, I1 - the peak charging current (probably 100 amps) at the start, all within a few seconds.
Okay, I got good results this time:
V0 = 343.42
V1 = 345.94 @ 50A (t0 + 1s)
V2 = 350 @ 105A (t0 + 2s)
So ... (350 - 343) / 105 = 0.07
That sound about right? My battery's SOH is 90.18%
Edit: One observation. On Monday, with ambient temps at 63F, going from 11% SOC to 85% SOC over 25mins resulted in the battery temp bar going from 5-bars to 7-bars. Today, with ambient temps at 73F, going from 22% SOC to 93% SOC over 26mins resulted in the battery temp bar going from 5-bars to only 6-bars. I wish I had a working temp sensor to get the actual battery temperature!
Good data. Thanks for gathering the data.
The resistance of .07 ohms (70 mohms) is basically the same, i.e. when comparing values at the same temps and not having controlled
tests, as what Dave's 2018 (40kWh) Leaf yielded and my 2013 (production 9/13). As I mentioned before, one would expect the battery
resistance to become lower as the battery capacity increased, i.e. more parallel cells with the same chemistry, but that has not occurred.
So with longer charging times, the later Leaf's will develop more internal heat, and retain that additional heat longer (assuming
the same battery thermal resistance).
Here're my 2013 Leaf 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 - 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 - 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