palmermd wrote:Volusiano wrote:Herm wrote:The only thing you can do is a complete cycle and recharge, measuring how much energy you put in.. yes this may require 20 hours of charging on 120V and a kill-a-watt meter... or just wait for the software update.
You still have to use the mile/kwh display from the LEAF to make the calculation.
Not true, the L1 charger which has been documented to charge at 78.3% efficient (
http://www.mynissanleaf.com/viewtopic.php?f=31&t=8583 ) will give you all the information you need. If you put in 20kw then the pack received 15.6kw. So for a new pack you should see 21kw into pack which should pull 26.8kW from the wall.
http://www.mynissanleaf.com/viewtopic.p ... start=3370" onclick="window.open(this.href);return false;
I have records of 240v 16a charge time to "80%" that I need to look at.
Phil (see link) reports
Total Charge Efficiency: 90.9%.
Does anyone have observations of charge efficiency
up to an "80%" charge level that differ significantly from Phil's?
If so, what was your methodology?
IIRC, many have reported efficiency in the 85%-90% range, but these often included the lower efficiency charge, from the "80% to "100%" charge level.
Ingineer
...These measurements are all using our Rev2 Upgraded EVSE:
120v: (112.6v recorded at EVSE input)
Standby Power: 1.7w
Charge Power in: 1.436kW
Power to Leaf Battery: 1.125kW
Total Power Lost: 311w
Total Charge Efficiency: 78.3%
240v: (239.8v recorded at EVSE input)
Standby Power: 3.4w
Charge Power in: 3.756kW
Power to Leaf Battery: 3.414kW
Total Power Lost: 342w
Total Charge Efficiency: 90.9%
All these measurements were with the Leaf pack at around 62 degrees F and ~65% SoC. Readings were allowed to stabilize before recording. The power to the Leaf battery was calculated by recording amperage at the cell interconnect level using a high-accuracy kelvin-connected current shunt, so the losses are a sum of all EVSE/Charger/Leaf systems. Charger input power was similarly recorded using lab-grade calibrated true RMS equipment, not a Kill-A-Watt.
These efficiency calculations do not take into account the coulombic loss in the Leaf's battery, and other Leaf systems during discharge, so this is only charging efficiency up to the battery pack itself but not including the pack, of which also has notable loss...
http://www.mynissanleaf.com/viewtopic.php?f=31&t=8583" onclick="window.open(this.href);return false;