SageBrush wrote: lorenfb wrote: SageBrush wrote:
How about this mod to the method:
Using LeafSpy, ~ same SoC
1. Measure i and V at home (L2 charging at 32 Amps) when the numbers are stable
2. Measure i and V at a DC fast charger when the numbers are stable
EA says that a DCFC is coming 'soon' to my city so that would give me another reason to try it out.
The DCFC is a gentle downhill from my home so the battery temp should change very little
Yes, but you need a step function change in current with basically a short rise time in the current (di/dt very low),
i.e. a no load to full load is ideal as in a vehicle launch mode.
I presume you mean a high di/dt.
Why is that preferred ? Is this an impedance Vs resistance thing ?
If so, does the battery have anything other than resistors ?
Yes, my typo, SB high. The fast rise time of the current prevents the battery from heating up and thus distorting the measurement
based on the initial temperature reading. Yes, there're other elements, but for all practical purposes the other elements (reactive)
can be neglected.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F