Expected Charge Rate At Home

[Sethro]

I am very ignorant when it comes to how the sausage is made. I just enjoy Tesla and their vehicles. The truck is much bigger than my old model Y that would get 47mph at home. Safe to say 27mph on the truck is expected using the same exact charger? Thanks in advance.

 

[TimeOut]

Yes, battery size and efficiency is different between the two vehicles. So, this tracks with what I see and similar to my Model 3 and CT charging.

 

[Hello4x]

Same. Getting about 25 mi/hr. Cyberbeast

 

[carsly]

Miles per hour is a measure of velocity, not charging speed.

Looks like you’re pulling 48amps at 240 volts. That’s a charge rate of 11.5kwh.

With a 123kwh battery you’re refilling a tick under 10% per hour. Distance you can cover with that charge will vary, as you know, based on speed, terrain, ambient temps, tire compounds, tire pressure, wind, rain, etc. As a result, there is no such thing as “miles per hour” for a charging rate.

 

[Sethro]

Miles per hour is a measure of velocity, not charging speed.

Looks like you’re pulling 48amps at 240 volts. That’s a charge rate of 11.5kwh.

With a 123kwh battery you’re refilling a tick under 10% per hour. Distance you can cover with that charge will vary, as you know, based on speed, terrain, ambient temps, tire compounds, tire pressure, wind, rain, etc. As a result, there is no such thing as “miles per hour” for a charging rate.

Makes sense. Thanks

 

[Stuck4ger]

There is a difference between being technically correct and being “good enough, layman’s correct”.

Tesla displays charging miles per hour because it’s something an average non-technical person can comprehend. Accordingly, Tesla drivers should be able to discuss it as such.

In this context, [charging] “mph” is an indication of charge rate for your vehicle, that is, how many relative miles of driving range the current charge rate is adding to your vehicle, per hour. Think of a supercharger in terms of a gasoline pump that can only pump a certain max flow rate into your vehicle. If you were filling a full-sized ICE truck that had a similar refueling display, you’d expect its refueling mpg rate to be only 50% of an efficient sedan’s. The CT is similar in that It is a bigger and heavier vehicle than a sedan and therefor doesn’t go as far for the same amount of battery energy. Thus its charge mpg is lower than a Tesla sedan’s would be. In order to drive a similar distance it must have a lot bigger battery which requires more time to charge at a given max charge rate and hence a lower charge mpg.

 

[Woodrick]

The thing to look at is the 48/48 241V.

The 48/48 means you are charging at 48 amps on a 48 amp circuit and at 241V which is the rated voltage.

The lower MPH is because the efficiency is less, more power needed per mile.

 

[HaulingAss]

Miles per hour is a measure of velocity, not charging speed.

Like most things, the meaning of "miles per hour" depends upon the context. In most cases it is referring to a velocity, in another context it refers to the number or EPA miles of range added per hour.

With a 123kwh battery you’re refilling a tick under 10% per hour. Distance you can cover with that charge will vary, as you know, based on speed, terrain, ambient temps, tire compounds, tire pressure, wind, rain, etc. As a result, there is no such thing as “miles per hour” for a charging rate.

True, the actual number of miles you will drive on that charge will vary. But the number of EPA miles is a well defined thing for each unique vehicle. There are even different EPA ratings for Cybertrucks with All-Season radials (vs. All-Terrain tires).

The rate of charge of any vehicle can be expressed in different ways. If we say the charge rate is 48 amps at 240V, that doesn't take into account the charging losses (which will vary from model to model). The EPA charge rate in miles per hour does take into account charging losses and then expresses the charge rate as a function of how many miles that vehicle could travel under a well-defined set of parameters (outside temperature, elevation change, speed and rate of acceleration at any given point in the drive cycle, etc).

This is a more useful number to know when comparing a vehicle to other vehicles. I would argue it's the only way to express rate of charge that is actually meaningful to most motorists and new car buyers. Sure, a geek might want to know exactly how many kWh of energy a battery can deliver after being charged at 11.5 kW for one hour but this number would be meaningless to most motorists and doesn't provide a useful basis for comparison to another vehicle (because what really matters is how many miles you can drive, on average, after charging for a defined period of time).

After 3000 miles my Cybertruck has a lifetime consumption of 395 Wh per mile. The EPA rating for my Cybertruck is 387 Wh per mile. My actual consumption is only 2% higher than the EPA rating so I know I can use the Cybertrucks maximum Level 2 charge rate in EPA miles per hour (around 27 miles per hour) as a good proxy for how many miles of real-world range I can add per hour.

If I don't go off paved roads or do full throttle launches, my real world charging rate can exceed 27 miles per hour.

Thus "miles per hour" can refer to a vehicles velocity or to a vehicles rate of charge. In the latter case it is shorthand for "miles of EPA range added per hour".

 

[AZCYBER]

Miles per hour is a measure of velocity, not charging speed.

Looks like you’re pulling 48amps at 240 volts. That’s a charge rate of 11.5kwh.

With a 123kwh battery you’re refilling a tick under 10% per hour. Distance you can cover with that charge will vary, as you know, based on speed, terrain, ambient temps, tire compounds, tire pressure, wind, rain, etc. As a result, there is no such thing as “miles per hour” for a charging rate.

No, it's charging speed too.

 

[yippie]

I am very ignorant when it comes to how the sausage is made. I just enjoy Tesla and their vehicles. The truck is much bigger than my old model Y that would get 47mph at home. Safe to say 27mph on the truck is expected using the same exact charger? Thanks in advance.

switch your display from miles to percentage and stop using the mph as a measure of charge rate, its stupid. you can see how many kilowatts/kwh are going to the truck thats all you need.

 

[carsly]

No, it's charging speed too.

except….it isn’t. Miles is a measure of distance. Hours is a measure of time. Distance over time, along with a directional vector if we want to be pedantic, is the definition of velocity.

How many miles per minute do you gain at the gas pump for ICE vehicles? In 30+ years of driving I’ve never once seen this misused metric applied to refilling.

You put gallons of fuel in a tank that has a volume measured in…gallons. Similarly, we measure how many kwh of electricity we feed into a battery that has a capacity measured in kwh. Same-same.

If you want to calculate range in either case take an assumption on distance per unit of stored energy consumed (miles per gallon or miles per kwh) and multiply. Again, same-same.

I’d argue Tesla did the industry a disservice by misapplying a velocity measure to charging.

 

[AZCYBER]

except….it isn’t. Miles is a measure of distance. Hours is a measure of time. Distance over time, along with a directional vector if we want to be pedantic, is the definition of velocity.

How many miles per minute do you gain at the gas pump for ICE vehicles? In 30+ years of driving I’ve never once seen this misused metric applied to refilling.

You put gallons of fuel in a tank that has a volume measured in…gallons. Similarly, we measure how many kwh of electricity we feed into a battery that has a capacity measured in kwh. Same-same.

If you want to calculate range in either case take an assumption on distance per unit of stored energy consumed (miles per gallon or miles per kwh) and multiply. Again, same-same.

I’d argue Tesla did the industry a disservice by misapplying a velocity measure to charging.

It's abbreviated, miles of range per hour of charge

 

[Woodrick]

Miles per hour is a measure of velocity, not charging speed.

Looks like you’re pulling 48amps at 240 volts. That’s a charge rate of 11.5kwh.

With a 123kwh battery you’re refilling a tick under 10% per hour. Distance you can cover with that charge will vary, as you know, based on speed, terrain, ambient temps, tire compounds, tire pressure, wind, rain, etc. As a result, there is no such thing as “miles per hour” for a charging rate.

So how many many miles will that add in an hour?

 

[RandyS]

I don't have a problem with the semantics of "miles of range added per hour of charging." I have several Tesla vehicles and each one has a different number, based on the amps/kw charging and the efficiency of the vehicle. The charging screen even tells me how long it will take to charge up to the % limit I have selected (say, 80%)...It works for me...

I find that when I am talking about EVs with a non-EV person, it helps them understand home charging better if I say that charging adds about "25 (or however many) miles of range for every hour of charging, usually while I'm sleeping." They get that...

 

[CyberGus]

I always see "charging at 25MPH" and think "but, it's not even moving!"