Best possible test would be to discharge the battery to 10% and recharge to 100% and measure the kWh needed using a good quality power meter. Some EVSEs have very acceptable power meters included. This plus battery temperature should allow a SOH measurement to fairly good accuracy.
ahr is only 98% of the likely original capacityFuManchu wrote: ↑Fri Jul 17, 2020 1:34 pmI checked a used Leaf which is very interesting to me. I did a Leaf Spy on it and the results were a bit suspicious, meaning they look too good to be true to me - see below.
It is an Acenta with 24 kWh battery. The car has close to 28.000 km, first registration was in 12/2015 in Germany.
The > 100% SOH seems suspicious to me and the rest of the numbers are also seem too good for a car of that age and mileage.
I heard about the possibility of a BMS reset with the consequence that the SOH is reset 100% and needs a couple of battery cycles to get back to reality. Does that also affect the GIDs? Is there anything else I could test to verify the SOH?
The condition of the car is very good and the price is reasonable for the age and mileage. It's from a big and trusted Nissan dealer in Germany so I really don't expect any manipulation. I would really like to buy it if everything is ok with the battery so I look forward to your opinions.
AHr = 66.02
SOH = 100.95%
Hx = 98.80%
Battery Voltage: 390.28V
2 QCs, 651 L1/L2s
241 GIDs 85.8%
SOC: 84.2% / 18.7 kWh remaining
Odo is equal to the mileage displayed on the dashboard.
Yes, and this alone is enough to make a recent BMS reset likely.ahr is only 98% of the likely original capacity
95%FuManchu wrote: ↑Sat Jul 18, 2020 1:21 pmThanks for all of your replies. I guess I'll make a longer test drive then, maybe including a charge on a Chademo station.
Two remaining questions:
Which efficiency can I expect from a Chademo charging station? Meaning what do i have to deduct from the kWh that the charging station is telling? I could extrapolate this value to 100% SOC to estimate the real current capacity of the battery.
Does the BMS reset also influence the number of GIDs?