I attached a MCC USB 503 http://www.mccdaq.com/usb-data-acquisition/USB-503.aspx
to the LEAF battery using a fuse tap to a spare fuse near the driver door and grounded to the LEAF chassis at the same fuse panel. I set the logging rate to 1 per minute and recorded the voltage starting at 9:15 for about 40 hrs.
Thanks for doing this! I've been doing some manual 12-V data logging in hopes of seeing hate effect of discharge for many days. Unfortunately, I never know when the car may be driven and when it may be parked.
One annotation which might be interesting would be whether the EVSE is plugged in or not. That seems to have a significant impact on quiescent draw.
TonyWilliams wrote:I'm surprised how low the voltage is allowed to go.
Me, too. I will also note that the use of 13-V charging does not quickly restore the battery to full charge. There is certainly a trade-off between risking overcharging and letting the battery sit too long below 100% SOC. All other vehicles I know of opt for 14.4-V charging (only). Perhaps Nissan felt this was the best choice for the deep-cycle battery in the LEAF.
I do hope Nissan figures out a way to reduce the current draw on the LEAF 12-V battery when it is just sitting.