DougWantsALeaf wrote: ↑
Mon Jun 15, 2020 8:13 am
Your May Numbers Struck me:
May 10, 2020
My car with 94.5X% SoH charges to 720 GIDS. SoH and GIDS should tightly align, no? Historically they were lock step. When I had 98.7% SOC, I was still above 750 GIDS. My first GID reading when I had re-enabled LeafSpy on the car was 770 GIDs (triple the highest reading on my 2013 Leaf. So either LeafSpy doesn't align fully to this battery, or SoH is representing something else. I feel like this is further evidence that the BMS is managing down usable capacity to hold down long terms degradation. The mystery deepens.
I had my battery check this morning. My battery is in perfect health according to the report. I have yet to get a battery report show anything else in the 2 (and soon to be 3...details tonight) Leafs we have owned. I asked the tech if they trained him on anything due to the BMS, or these quarterly cycles we have been seeing.... Pretty blank stare in return. I know that will be shocking for this board.
Danjones, do you have a Leaf or Leaf Plus. How many GIDS does you car show with a full battery?
I am beginning to be convinced that the BMS programming is artificially adjusting useable capacity based on use/charge patterns. Gids on my car at full charge have varied. The highest recorded was 737 and the lowest so far has been 714. Here are some key numbers with comments to consider:
730 8/11/2019 189 miles (first full charge)
722 9/02/2019 683 miles (first charge after sitting at airport for over 2 weeks)
737 9/21/2019 2,153 miles (highest reading)
737 10/27/2019 4,630 miles (after first 90-day adjustment)
736 3/06/2020 13,152 miles (start of reduced driving/charging)
735 4/19/2020 14,923 miles (before last 90-day adjustment)
720 4/29/2020 15,383 miles (after last 90-day adjustment completed)
714 6/10/2020 17,200 miles (last full charge)
The numbers were in the 720's and 730's until a downward trend started after the last 90-day adjustment. There were about 6 weeks of reduced daily driving and reduced freeway driving before the last adjustment. As you can see, the number dropped for a while after the car was parked for 2 weeks, but recovered when daily driving resumed.