Sat Jan 29, 2011 9:20 pm

Without all the numbers, it is difficult to tell. But, I suspect that the following MIGHT fit the data better:

1. A/C and Heating might be incorrectly combined into the other-energy ("H") category.

2. The motor uses "T" Total energy from the battery:

a. "C" recovered from the "W" used to charge from the wall, and

b. "E" recovered from the Regen ("R") energy used to re-charge the battery while driving.

T=C+E

C+H is less than W, perhaps 85% to 90% of W (this includes losses in: EVSE, wires, charger, battery energy-in, and the larger battery energy-out loss)

E is less than R, assume E = 0.8 R (80% of R gets recovered)

3. The Net energy consumed by the "motor" is "C".

4. The motor energy-usage sensor in the LEAF might be reporting Z= C+E - R (outbound power minus inbound power) as the "consumed" figure to CARWINGS, which is incorrectly interpreted there as "Total consumption", and they use Z-R as their net motor-energy consumption value.

Note that Z-R=C+E-R-R

To figure net consumption however, we want just "C", but they are "almost" using C-R, way too low if there is any significant % of regen.

Assuming I am guessing correctly, instead of subtracting R they should ADD R and subtract E. Or, assuming E= 80% of R, just ADD something like 20% of R.

Doing that, adding about 0.2 x R to the CARWINGS "consumption" value, AND adding properly-reported "Other" energy usage value gets one closer to a value that matches "C+H", and is a reasonable percentage of W.

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Summary: take CARWINGS "consumption" and ADD (0.2 x R) and add a reasonable "other" figure, and see if that gives you a better-matching miles/kWh figure, and more-reasonable Wall-Charging losses.

See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale

2011 LEAF, sold in 2015

2018 Tesla Model 3

2014 Tesla S, Model 3 in 2019

PU: SDG&E

Solar PV: 33 x 225W -> 7 kW max AC

To Sell: X-treme 5000Li EV motorcycle