Stoaty
Well-known member
Edit 10/19/13: Latest version of Battery Aging Model spreadsheet (1.00) is now on the Wiki:
http://www.mynissanleaf.com/wiki/index.php?title=Battery_Capacity_Loss#Battery_Aging_Model" onclick="window.open(this.href);return false;
Original post:
It has become evident that the battery aging model is probably too optimistic--probably because it was adjusted to match the graph shown to TickTock by one of the Nissan engineers. I have been thinking about how to calibrate the model to more accurately show expected capacity loss in various climates, and believe I have come up with an idea that may allow me to do that. In the past, we didn't have a good measure of capacity, but the recently available Amp-Hour reading obtainable from the LeafDD or Leaf Battery App looks like a pretty accurate measure of capacity. If we can gather enough readings from enough different climates, I may be able to calibrate the model.
Here is the data that is needed. Please post to this thread only if you have and are willing to share all of the data requested; otherwise it won't be useful.
--Date of Manufacture (month and year)
--Date of Delivery (month, day and year)
--Date of P3227 update, if needed (should be at least 6 weeks prior to reading data)
--Geographic location - be specific, must include city and state, otherwise data of no use (also include work location city and state and days Leaf spends at work if climate significantly different than home)
--Average miles/kwh for the life of your Leaf (your best guestimate OK)
--Current odometer reading (i.e. total miles your Leaf has been driven)
--Current AH capacity reading from LeafDD or Leaf Battery App
Exact date you took current odometer reading and current AH capacity
Days per week parked in the sun (fractional days OK)
Here is an example with my data:
Manufactured - 03/11
Delivered - 6/17/11
P3227 updte - 7/15/13
Location - West Los Angeles, CA; Leaf spends 4 days a week in Canoga Park, CA
Miles/kwh - 5.6
Odometer - 20720
Capacity - 57.07
Date - 9/10/13
Parked in sun - 4 days/week
http://www.mynissanleaf.com/wiki/index.php?title=Battery_Capacity_Loss#Battery_Aging_Model" onclick="window.open(this.href);return false;
Original post:
It has become evident that the battery aging model is probably too optimistic--probably because it was adjusted to match the graph shown to TickTock by one of the Nissan engineers. I have been thinking about how to calibrate the model to more accurately show expected capacity loss in various climates, and believe I have come up with an idea that may allow me to do that. In the past, we didn't have a good measure of capacity, but the recently available Amp-Hour reading obtainable from the LeafDD or Leaf Battery App looks like a pretty accurate measure of capacity. If we can gather enough readings from enough different climates, I may be able to calibrate the model.
Here is the data that is needed. Please post to this thread only if you have and are willing to share all of the data requested; otherwise it won't be useful.
--Date of Manufacture (month and year)
--Date of Delivery (month, day and year)
--Date of P3227 update, if needed (should be at least 6 weeks prior to reading data)
--Geographic location - be specific, must include city and state, otherwise data of no use (also include work location city and state and days Leaf spends at work if climate significantly different than home)
--Average miles/kwh for the life of your Leaf (your best guestimate OK)
--Current odometer reading (i.e. total miles your Leaf has been driven)
--Current AH capacity reading from LeafDD or Leaf Battery App
Exact date you took current odometer reading and current AH capacity
Days per week parked in the sun (fractional days OK)
Here is an example with my data:
Manufactured - 03/11
Delivered - 6/17/11
P3227 updte - 7/15/13
Location - West Los Angeles, CA; Leaf spends 4 days a week in Canoga Park, CA
Miles/kwh - 5.6
Odometer - 20720
Capacity - 57.07
Date - 9/10/13
Parked in sun - 4 days/week