jsantala said:
Thanks, RObertC, that's just about as comprehensive as it gets.
I'll second that sentiment!
But, I couldn't get my TED data to jive with RObertC's comprehensive testing. So in the interest of peer review and my inability to stop thinking about something until it makes sense, or at least some sense.
I recreated his measurements and found almost identical numbers on the DC side. I also measured and added in the low voltage output on the charger. Even though it's relatively insignificant compared to the rest of the system.
On the DC to the pack I measured 8.14amps at 352 volts for 2865 watts out Then the low voltage DC is putting out 2.86 amps at 14.4 volts for an additional 41 watts. A total of 2906 watts output. Very close to to the previous analysis indeed. That's good!!
Now on the AC side of things is where the discrepancies are that had my TED data calling things into question. At 241 volts AC the charger was pulling 12.69 amps or a total of 3060 watts. This fit my TED data at the time which was 3058 watts going to the EVSE. So that's 3.06KW not the 3.3 KWH claimed for the charger or the almost 3.3 measured by RObertC. My observations yield a charger efficiency of 2906/3085 = ~94%
I think we are both right and the charger efficiency has been improved between the 2012 and 2014 model years. It's the same manufacturer (Nichicon) so nice job by them!
I think his data is accurate and I know mine is. I guess you can't complain if the improved charger doesn't draw 3.3KW when it's output is identical to it's ancestor which did
. I also learned from looking at the low voltage output of the charger that the coolant pump draws 67 watts when it is running.
Aerowhatt