Lifetime Average Wh/mi

[youlikeadajuice]

May and lifetime numbers:

 

[ZBB]

Here's my update as of May 31. I took delivery on June 4 last year, so I'm considering this my anniversary reading. I reset both A and B meters -- decided I'm going to use B as an annual meter... I keep a spreadsheet, so will still report lifetime -- just will be calculated instead of off the trip meter...

Lifetime (4 days shy of 12 months):
ZBB 294 16,726 AZ 60 19 1 5/31/14

May only:
ZBB 286 1,021 AZ 60 19 1 5/31/14

Observations: My Lifetime hit another low. May was the 3rd lowest month -- starting to see the impact of AC use in AZ. Will be interesting to see how the year over year is...

 

[kendallpb]

Yay, it's gone down a bit, even with a trip to Raleigh! A lot more driving, too.... As usual, "A" is my near-lifetime and "B" is the past month.

ONE-MONTH:
kendallpb 05-01-2014 318 3,777.8 MD S85 19" (May)
(formerly 331! makes me kinda wish I tracked this month-to-month, but I'm too lazy to go back and pick it out of the thread ;-) )

LIFETIME:
kendallpb 11-09-2013 325 11,699* MD S85 19"
kendallpb 12-01-2013 328 12,596 MD S85 19"
kendallpb 01-03-2014 333 14,460 MD S85 19"
kendallpb 02-01-2014 338 15,637 MD S85 19"
kendallpb 03-02-2014 341 17,326 MD S85 19"
kendallpb 04-02-2014 342 18,230 MD S85 19"
kendallpb 05-01-2014 341 19,825 MD S85 19"
kendallpb 06-01-2014 338 22,008 MD S85 19"

 

[Mario Kadastik]

An update from me as well.
May: 2245km, 492.7kWh, 219Wh/km average
Lifetime: 13853km, 3326.7kWh, 240Wh/km average

 

[Treker56]

Starting tracking monthlies again. 60 kWh 19" NoVa

May Miles: 1223 May Energy: 365 kWh Avg Energy: 298 kWh

 

[Al Sherman]

May:
Al Sherman 290 785 IN 85 19 1 5-30-2014

LIFE:
Al Sherman 308 12,568 IN 85 19/21 5-30-2014

 

[mknox]

May update:

Lifetime:
26,453.8 miles
9,131.1 kWh
345 Wh/mi

Month:
Car : 2,127.9 miles
Car: 651.3 kWh
Car: 306 Wh/mi

May Actual energy: 785.7 kWh
May Actual Wh/mi: 369.2

 

[paco3791]

May:
Paco3791 284 2066 IL 60 19

LIFE:
Paco3791 357 13,009 IL 60 19

- - - Updated - - -

May update:

Lifetime:
26,453.8 miles
9,131.1 kWh
345 Wh/mi

Month:
Car : 2,127.9 miles
Car: 651.3 kWh
Car: 306 Wh/mi

May Actual energy: 785.7 kWh
May Actual Wh/mi: 369.2

So my quick math shows that comes out to ~17% losses due to charging inefficiency. That seems reasonable but higher than numbers I've heard reported elsewhere from Tesla and others on this site (more in the 8-12% range for charging loses), though I haven't seen a ton of actual data on the subject. Any insight you've gained from looking at these numbers?

 

[mknox]

So my quick math shows that comes out to ~17% losses due to charging inefficiency. That seems reasonable but higher than numbers I've heard reported elsewhere from Tesla and others on this site (more in the 8-12% range for charging loses), though I haven't seen a ton of actual data on the subject. Any insight you've gained from looking at these numbers?

My interest in all of this is simply to try and calculate what comes out of the wall (and hence, what I pay for) that is directly attributed to the car. The trip meter does a pretty good job of reporting what comes out of the battery and makes its way to the road, but I believe they should also have a register that shows what went in via the charge port. I do this with a dedicated meter on my EV circuit and a spreadsheet where I track my public charger use.

Some of this may be attributable to pre-heating the car on shore power, but I didn't do this at all in May. I drive daily and my car doesn't sit around for long periods so, if anything, the "Vampire" losses should be lower in my use case.

A secondary point to my posting this information is to educate people to the fact that the car is actually "using" more electricity than the trip meter reports. If you had a gasoline car with a slow leak in the gas tank, you'd still consider what you paid at the pump, not just the leftover gas that the car burned.

 

[dirkhh]

May: dirkhh 303 782 OR 60 19
Life: dirkhh 325 15098 OR 60 19

I think this was my best month so far (and one of the lower miles driven ones as I was in Asia for almost two weeks)

 

[Blathering1]

I think I have a different rev of the Model S.... June is 506 Wh/mi so far. No highway in this month, but it has been a cool month.

 

[Cottonwood]

My interest in all of this is simply to try and calculate what comes out of the wall (and hence, what I pay for) that is directly attributed to the car. The trip meter does a pretty good job of reporting what comes out of the battery and makes its way to the road, but I believe they should also have a register that shows what went in via the charge port. I do this with a dedicated meter on my EV circuit and a spreadsheet where I track my public charger use.

Some of this may be attributable to pre-heating the car on shore power, but I didn't do this at all in May. I drive daily and my car doesn't sit around for long periods so, if anything, the "Vampire" losses should be lower in my use case.

A secondary point to my posting this information is to educate people to the fact that the car is actually "using" more electricity than the trip meter reports. If you had a gasoline car with a slow leak in the gas tank, you'd still consider what you paid at the pump, not just the leftover gas that the car burned.

From what I have seen, the charging efficiency is about 10% loss for the AC charger and about 3.3% for charge/discharge cycle. 0.9*0.967= 87% or about a 13% loss.

I believe that the vampire sips whenever the car is not "on." In fact, if there are frequent on/off periods, the vampire is awake more and sips more blood. If we assume that the vampire drinks 3 miles a day, no matter what, then 30 days times 3 rated miles per day is 90 rated miles; at 333 AC Wh/rated mile, that is about 30 kWh of vampire loss. 30 kWh/786 kWh is 3.8% vampire loss. 0.87*0.962= 0.837 or a 16.3% loss; that is getting pretty close to your 17% number...


BTW, here are the Wh per Rated Mile numbers that I have found make sense at various locations in the process:

• 290 Wh per Rated Mile - DC out of the battery - This is what makes rated miles equal actual miles in my M85.
• 300 Wh per Rated Mile - DC into the battery - This is the number that makes Supercharging rates vs kW make sense. A 3.3% charge/discharge loss.
• 333 Wh per Rated Mile - AC out of the wall - This assumes 90% efficiency for the AC charger.

 

[paco3791]

My interest in all of this is simply to try and calculate what comes out of the wall (and hence, what I pay for) that is directly attributed to the car. The trip meter does a pretty good job of reporting what comes out of the battery and makes its way to the road, but I believe they should also have a register that shows what went in via the charge port. I do this with a dedicated meter on my EV circuit and a spreadsheet where I track my public charger use.

Some of this may be attributable to pre-heating the car on shore power, but I didn't do this at all in May. I drive daily and my car doesn't sit around for long periods so, if anything, the "Vampire" losses should be lower in my use case.

A secondary point to my posting this information is to educate people to the fact that the car is actually "using" more electricity than the trip meter reports. If you had a gasoline car with a slow leak in the gas tank, you'd still consider what you paid at the pump, not just the leftover gas that the car burned.

Thanks mknox! and please keep posting the numbers.

 

[Brass Guy]

Lifetime:
18817 miles, 308Wh/m S85 in MA on 19's
May numbers:
1985.7 miles, 261Wh/m

Not sure I'm going to get the lifetime average below 300 again before winter sets in, but it's getting there.

 

[dfitz206]

End of May update:

S85 19" 29,741miles 334 wh/mi

Warmer and drier weather is helping bring down the wh/mi number

 

[MichaelS]

 

[gg_got_a_tesla]

Oy, @MichaelS, 278 Wh/mile is an incredible number for a 60 that was produced the same week and is in service in the same area as that of @Kipernicus's, @hans's and mine. We are struggling to come down to 300 and are hovering in the 308-309 range.

 

[MichaelS]

It's the balloon squeal that gives me such good numbers. I hate that sound. :wink:

Not really, though I don't punch it very often. Most of my driving is commuting from Hayward to South Fremont in the car pool lane. I do try to keep my speed as constant as I can leaving a pretty good gap to the car in front of me. Even on freeway trips I usually stick to 60 mph on cruise. I am surprised at the numbers I'm getting, even wondering if the car is reporting them correctly. This morning I saw the 5 mile graph showing an average wh/m of about 190.

And, my alignment must be pretty good.

I just can't get over how incredible this car is.

Oy, @MichaelS, 278 Wh/mile is an incredible number for a 60 that was produced the same week and is in service in the same area as that of @Kipernicus's, @hans's and mine. We are struggling to come down to 300 and are hovering in the 308-309 range.

 

[Bugeater]

May usage. I'm late due to being in KC for a wedding...

Note, that 411 number since last charge is due to showing off the car at my new job! [8^)

 

[taraquin]

My winter Wh\mi was 360 Wh\ml. My summer Wh\ml (since last half of April) har been 265 The batteryheater is the major problem in the winter. On short trips I get consumption of over 600! The same trips now uses 260!