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I see a lot of analysis on RWD and P3D. Well, what about AWD. If RWD is getting 330 in real world "good" conditions, and many feel P3D is under 300, what's AWD getting?
and yeah, velocity must be less than 70-75.
EPA docs says the car has an 80 kWh battery, Tesla says 75. So doing some math from Teslas number yields 242 Wh/mi as the number needed to meet stated range 258 Wh/mi from the EPA number. In the energy app I believe rated line is a little below 250 Wh/mi.I've been paying a bit closer attention to this just for geek data on this charge, and I'm now curious what the wh/m target would be for the stated range.
Last Friday I charged the car to 90%, I haven't charged since, so I'm also dealing with vampire drain which based on checking the app isn't that bad. The car is now at 37% battery and I've driven ~130 miles. The average for this period is 262 wh/mile which to me represents fairly efficient driving. That means 53% battery usage yields 130 miles of driving. That means that 100% range in these conditions is 245 miles. Reducing that to 80% (as you'd ideally charge to 90% and recharge at 10%), yields a 196 mile range. This doesn't factor in the idle/vampire drain which is probably 3-5 miles per day. I don't pre-warm the car as the weather this week in Austin has been fabulous, so it's really just driving and vampire in ideal weather conditions.
I don't drive a lot and I bought this car with the intention of charging once per week, so for me 150-175 miles of range with a lot of comfort-level is fine for me, but I really have been driving the car very efficiently. I get 180-200 wh/mile on my 8 mile commute to work and 300-320 on the way home (uphill). Add in some weekend highway driving and I'm at 262 for the charge period.
Additionally, the car states in this 53% usage, 262 wh/mile that the car has used 34 kwh of power. So that math doesn't add up as I thought these things had like 85 kwh packs. One hypothesis is the 34 kwh usage reports only driving miles and doesn't include the idle/vampire drain. I've recently switched from remaining miles to energy % as I find it a better barometer and better allows me to try to calculate usage, but I'm finding I can't really make any of the math work out. It doesn't really bother me, just posting for another data point. I've only got 500 miles on the car and this is the first charge that I've been monitoring.
I've been paying a bit closer attention to this just for geek data on this charge, and I'm now curious what the wh/m target would be for the stated range.
Last Friday I charged the car to 90%, I haven't charged since, so I'm also dealing with vampire drain which based on checking the app isn't that bad. The car is now at 37% battery and I've driven ~130 miles. The average for this period is 262 wh/mile which to me represents fairly efficient driving. That means 53% battery usage yields 130 miles of driving. That means that 100% range in these conditions is 245 miles. Reducing that to 80% (as you'd ideally charge to 90% and recharge at 10%), yields a 196 mile range. This doesn't factor in the idle/vampire drain which is probably 3-5 miles per day. I don't pre-warm the car as the weather this week in Austin has been fabulous, so it's really just driving and vampire in ideal weather conditions.
I don't drive a lot and I bought this car with the intention of charging once per week, so for me 150-175 miles of range with a lot of comfort-level is fine for me, but I really have been driving the car very efficiently. I get 180-200 wh/mile on my 8 mile commute to work and 300-320 on the way home (uphill). Add in some weekend highway driving and I'm at 262 for the charge period.
Additionally, the car states in this 53% usage, 262 wh/mile that the car has used 34 kwh of power. So that math doesn't add up as I thought these things had like 85 kwh packs. One hypothesis is the 34 kwh usage reports only driving miles and doesn't include the idle/vampire drain. I've recently switched from remaining miles to energy % as I find it a better barometer and better allows me to try to calculate usage, but I'm finding I can't really make any of the math work out. It doesn't really bother me, just posting for another data point. I've only got 500 miles on the car and this is the first charge that I've been monitoring.
Meters don’t included energy used when car is in park.
We have 75kWh packs (usable, actual pack is probably slightly larger). So Tesla’s scalar should be 75kWh/310mi =242Wh/mi. You’ll see this is about where the “target” line is on the energy display. (Maybe some debate on the EXACT numbers, but it doesn’t matter. The line is below 250Wh/mi and above 235Wh/mi, for sure.)
0.9*75kWh = 67.5kWh
0.37*75kWh = 27.75kWh
Used energy: 39.75kWh
130mi*262Wh/mi = 34.06kWh
Used Energy = Driving Energy + Other Losses
Other losses = 39.75kWh-34.06kWh = 5.69kWh
You’ve lost 14% of your consumed energy to heating while parked, sitting while parked, vampire drain, etc.
Tesla says you should expect 1% per day, which is 0.01/day*310mi * 242Wh/mi = 0.75kWh/day, so you’d expect at least 3kWh loss from that over 4-5 days (and that assumes no touching of the car I would think). I’d expect more; 4kWh seems totally possible over that timeframe.
It all checks out. Easy stuff, just have to know how things are counted.
Perfect, that helps and does all add up. As stated, I tend to lose ~3 miles per day sitting in my garage.
View media item 119269
This is from a trip I recently did in one day
Started at 100% 75000 watts
drove 126 miles
stopped 2 hours
drove back 126 miles
finished with 11% 8250 watts
trip shows i used 62000
so 4750 watts or 6.3% of battery went to vampire drain in 2 hours?? that can't be right. There must be some kind of buffer where there is still watts available but state of charge shows zero.
I was impressed with the efficiency ... average 72-75 mph on freeway 98% of trip. 55-60 degrees outside. LR RWD aeros
You mean 70 kWh?Honestly, your numbers make me believe we have 80kWh, and you were calculating for 75
yes, but 70 - 62 = 8 kWh this accounts for the missing amount.No, he specifically typed out "75000 watts"
yes, but 70 - 62 = 8 kWh this accounts for the missing amount.
80 - 62 = 18 kWh - 8 he had left leaves 10 kWh MORE.
He's losing energy not gaining it.
Yes this is what I was saying.
Used 62 kWh
Have 8.25 kWh remaining
only stopped for 2 hours
View media item 119269
This is from a trip I recently did in one day
Started at 100% 75000 watts
drove 126 miles
stopped 2 hours
drove back 126 miles
finished with 11% 8250 watts
trip shows i used 62000
so 4750 watts or 6.3% of battery went to vampire drain in 2 hours?? that can't be right. There must be some kind of buffer where there is still watts available but state of charge shows zero.
I was impressed with the efficiency ... average 72-75 mph on freeway 98% of trip. 55-60 degrees outside. LR RWD aeros
You should check your elevation at work and at home, by the way. To me it looks like this is largely a downhill run, for that economy & speed (though drafting could have been helping too). But for the P3D+ I doubt it is just drafting. So if you see more on the way home you know why.
It is 1.6kWh (6.6 rated miles) or so per 1000 feet for the AWD/P3D, unless you are carrying rocks. You have to distribute it by number of miles and add/subtract to your drive economy to correct for it.