cwerdna said:
goldbrick said:
Is SOH a parameter that is generated by the BMS, or is it some internal calculation that Leaf Spy does?
I think SOH is a parameter generated by the BMS and reported by LeafSpy. Like the 'Hx' reading which is also reported by LeafSpy.
I've never heard a definitive answer on how either one is calculated and I don't think anyone here even knows exactly what Hx means.
https://www.mynissanleaf.com/viewtopic.php?p=497564#p497564
https://www.mynissanleaf.com/viewtopic.php?f=44&t=14285&p=516444&hilit=nissan+meaning#p516444
Re: the bolded part,
we'd need to hear some official acknowledgement, statement or documentation from Nissan about what Leaf Spy renders as SOH or Hx. AFAIK, there's been none, so all we can do is compare notes.
Some values that Leaf Spy renders can be verified like temps, tire pressures and voltages (https://www.mynissanleaf.com/viewtopic.php?t=17470).
Really? Surely some on MNL have the engineering background to gather Leaf data using LeafSpy/LeafDD and
infer what the data indicate, right? Here're battery resistance (mohms), increasing over time, data presented
numerous times on MNL from my Gen 1 Leaf ;
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
10/15/16 - 40,000 miles, 71 mohms per LeafDD, 27 deg, 45% SOC
Lowest Temp (11 degrees C) - 103 mohms - 15K miles
Highest Temp (32 degrees C) - 56 mohms - 18K miles
Lowest mohms - 55 (28 deg, 14K miles)
Highest mohms - 103 (11 deg, 15K miles)
Battery Aging Per Mileage - 55 mohms (28 deg, 14K miles), 71 mohms (27 deg, 40K miles)
Since conductance is the inverse of resistance, one can conclude that battery conductance (Hx) declines over
time with SOH as to be expected, i.e. a battery becomes less efficient - SOH declines.