I was just thinking about range tests published here and elsewhere
Range is really kind of a 3 dimensional graph where speed/temperature/SOC interact
People will drive whatever speed they drive, but really, if you are actually concerned with range, are you driving 70mph? I mean I drive 70 mph, more, but if you are on a trip where it matters, is that the smart move? ON a 500 mile trip it amounts to a bit over half an hour. Yet it can have a significant effect on range.
I would think in the bell curve of trip lengths, the most common trips are obviously under the range of the EV. So the real question is more can I make the 2 hour each way to grandmas without charging? If it took you 8 minutes longer to get there, but it meant you could do it without stopping, isn't that the thing to do? It doesn't mean you would drive 50 since the time gets much longer and the return diminishes. But the ability to not stop at all, or maybe plug into 120 when you get there to add a few miles as insurance, that is a real thing
I also don't see the point of the drive it till it dies routine. Sure, it is intellectually interesting to see how much reserve a car has, but that is not really a useful driving measure. Do we really need to ponder EVs limping down the shoulder as a viable option?
Why not drive them to an agreed upon battery level? Like 10 percent , or 5 percent, something a person would actually do. Then extrapolate from the battery level and actual miles/kwh used to come up with a range. Unless we are finding some hidden range in certain cars, I really don't see that it is particularly less accurate.
IF you drive a car with an approximate range of 230 miles to 5 percent left, the total error must be less than 5 percent of range, in fact it is most likely within .5 percent of range[10 percent of the remainder] I would think this is much smaller than all the other variables.
Example:
Drive a car that you think will get about 230 miles range until it hits 5 percent battery remaining. It is 219 miles. That 5 percent would most likely get you about 11 miles down the road
219/95x100=230.5
Are you likely to get 20 [highway]miles out of that 5 percent?
No
Are you likely to get 1 mile out of that 5 percent?
No
Might you get as much as 15 or as little as 6?
Absolutely
2 percent
I mean, really, close enough, as I said, smaller than the other variables.
If you get reports that a Tesla will get huge miles after it hits 5 percent, or the Kia drops to zero right after it hits 5 percent, this is need to know information.
I am not trying to be hyper critical of people doing this important work, data is valuable, and not everyone can just drive around. Data can become information, information can become knowledge......
Range is really kind of a 3 dimensional graph where speed/temperature/SOC interact
People will drive whatever speed they drive, but really, if you are actually concerned with range, are you driving 70mph? I mean I drive 70 mph, more, but if you are on a trip where it matters, is that the smart move? ON a 500 mile trip it amounts to a bit over half an hour. Yet it can have a significant effect on range.
I would think in the bell curve of trip lengths, the most common trips are obviously under the range of the EV. So the real question is more can I make the 2 hour each way to grandmas without charging? If it took you 8 minutes longer to get there, but it meant you could do it without stopping, isn't that the thing to do? It doesn't mean you would drive 50 since the time gets much longer and the return diminishes. But the ability to not stop at all, or maybe plug into 120 when you get there to add a few miles as insurance, that is a real thing
I also don't see the point of the drive it till it dies routine. Sure, it is intellectually interesting to see how much reserve a car has, but that is not really a useful driving measure. Do we really need to ponder EVs limping down the shoulder as a viable option?
Why not drive them to an agreed upon battery level? Like 10 percent , or 5 percent, something a person would actually do. Then extrapolate from the battery level and actual miles/kwh used to come up with a range. Unless we are finding some hidden range in certain cars, I really don't see that it is particularly less accurate.
IF you drive a car with an approximate range of 230 miles to 5 percent left, the total error must be less than 5 percent of range, in fact it is most likely within .5 percent of range[10 percent of the remainder] I would think this is much smaller than all the other variables.
Example:
Drive a car that you think will get about 230 miles range until it hits 5 percent battery remaining. It is 219 miles. That 5 percent would most likely get you about 11 miles down the road
219/95x100=230.5
Are you likely to get 20 [highway]miles out of that 5 percent?
No
Are you likely to get 1 mile out of that 5 percent?
No
Might you get as much as 15 or as little as 6?
Absolutely
2 percent
I mean, really, close enough, as I said, smaller than the other variables.
If you get reports that a Tesla will get huge miles after it hits 5 percent, or the Kia drops to zero right after it hits 5 percent, this is need to know information.
I am not trying to be hyper critical of people doing this important work, data is valuable, and not everyone can just drive around. Data can become information, information can become knowledge......
