Expected Charge Rate At Home

[Woodrick]

Why do people have to be so hard-headed to think that rates aren't used in all sorts of situations?
Just because it isn't what you are used to only shows how narrow your horizons are.

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[TyPope]

I use miles per hour for charging at home. It isn't stupid. Why would you assume if it isn't your way, it's stupid. Besides, it's a great, simple method to explain to people how charging at home is different. We had to charge our Model Y on 120v for a while. Someone at work asked me why I was going to put in a 240v wall connector if I was already able to charge at home.

I explained how I could charge more and started to explain 120V x 15 Amps... eyes glazed over. Then I said, "I can charge 4 mph on 120v or 34 mph on 240v". He said "Oh. Yeah, that's a lot different. I thought it would just be twice as much."

Not technically as succinct, but more useful, nonetheless.

 

[TyPope]

Maybe Tesly should have replaced the range number but in my regular ice vehicle, it doesn't show percent of gas remaining. Why should my Cybertruck show percent of electricity remaining? People are smart enough to know driving affects efficiency.

 

[Woodrick]

Maybe Tesly should have replaced the range number but in my regular ice vehicle, it doesn't show percent of gas remaining. Why should my Cybertruck show percent of electricity remaining? People are smart enough to know driving affects efficiency.

It doesn't have a gas gauge with 1/4, 1/2, 3/4 and full marked? FYI, that's 25%, 50%, 75%, and 100%.

 

[Pops]

Why do people have to be so hard-headed to think that rates aren't used in all sorts of situations?
Just because it isn't what you are used to only shows how narrow your horizons are.

Exactly I use MPH to measure the amount of friction I generate with my wife during happy fun times. You can make a lot of miles in a hour in 3 inches increments .

 

[TyPope]

It doesn't have a gas gauge with 1/4, 1/2, 3/4 and full marked? FYI, that's 25%, 50%, 75%, and 100%.

No. It's a bunch of squares. But, I get your point and you got mine. Apples to apples.

 

[TyPope]

I'm no Nazi. I was comparing the two types of "fuel" remaining gauges. We actually do keep the car showing percentage rather than miles remaining. But, it's easier to visualize range added by Mike's per hour. My wife drove 80 miles round trip to get to a specific grocery store. She planned her trip based on when she could charge up enough.

Her daily drive was 20 miles.
Her shopping trip was 80 miles.
"Fueling" was @ 4mph.
She could charge 10 hours a day.
The math becomes easy this way and her driving efficiency is consistent.

That's why we got into the habit. Now that we have 240v installed, it doesn't matter.

Sorry about the grammar. It was a focus when I was growing up and I was always corrected. That shouldn't mean I have to be an ass about it.

 

[CyberGus]

Godwin!

 

[igs]

Miles is meaningless. It's only there for the lowest common denominator people to look at. Same with state of charge. Imagine the outrage if Tesla said to only charge to 50%. So for the hoi polloi they say you can charge to 90%. Oops it's now 80%. Oops it's now....

 

[SE.MI.CT]

So much unnecessary nastiness in this thread. Yall don't have to be calling each other dummyheads because they choose to think about charging and mileage differently than you. Be better.

The reason I prefer to think only in terms of kW and kWh is that the conversion to miles involves unknown variables. What's the temp, how heavy is your foot, are you towing, are you going up hill both ways...

120 @ 12 Amps is 1.3 kW. Charging for an hour is 1.3 kWh, which is about 1% battery (123 kWh in the CT).

240 @ 32 Amps is 7.7 kW. Charging for an hour is 7.7 kWh, which is about 16% battery.

Saying that you charge 3 Miles of Range per Hour or 17 Miles of Range per Hour is just an inherently wrong / inaccurate measure. Your 7.7 kWh (17 miles?) you charged last night might never amount to 17 miles. But that 7.7 kWh is 7.7 kWh.

It's also more natural for anyone coming from Gas. I didn't fill up with 340 Miles of gas. A gallon of gas isn't always 25 miles.

And your mileage is even less relevant when you are charging at home. So long as I'm not using the full 80% of my battery every day, and so long as my charging rate (kW) is sufficient to bring my battery back up to "full" 80% every night, doing the extra last conversion to miles is utterly pointless.

The only time I even think about charging in terms of miles would be on a longer trip with superchargers, where it makes sense to think about "I'm stopping at 10%, charging for 15 minutes until 50%, which will give me about 160 miles of range and let me drive for another 2 hours before stopping." [But, of course, this is all handled by navigation so you don't really need to do any of these calculations, but just conceptually for a trip it's nice to think about stuff like "20 minute stop is about 2.5 hours of driving, 40 minute stop is about 4 hours of driving.]

 

[CTSoFL]

So much unnecessary nastiness in this thread. Yall don't have to be calling each other dummyheads because they choose to think about charging and mileage differently than you. Be better.

The reason I prefer to think only in terms of kW and kWh is that the conversion to miles involves unknown variables. What's the temp, how heavy is your foot, are you towing, are you going up hill both ways...

120 @ 12 Amps is 1.3 kW. Charging for an hour is 1.3 kWh, which is about 1% battery (123 kWh in the CT).

240 @ 32 Amps is 7.7 kW. Charging for an hour is 7.7 kWh, which is about 16% battery.

Saying that you charge 3 Miles of Range per Hour or 17 Miles of Range per Hour is just an inherently wrong / inaccurate measure. Your 7.7 kWh (17 miles?) you charged last night might never amount to 17 miles. But that 7.7 kWh is 7.7 kWh.

It's also more natural for anyone coming from Gas. I didn't fill up with 340 Miles of gas. A gallon of gas isn't always 25 miles.

And your mileage is even less relevant when you are charging at home. So long as I'm not using the full 80% of my battery every day, and so long as my charging rate (kW) is sufficient to bring my battery back up to "full" 80% every night, doing the extra last conversion to miles is utterly pointless.

The only time I even think about charging in terms of miles would be on a longer trip with superchargers, where it makes sense to think about "I'm stopping at 10%, charging for 15 minutes until 50%, which will give me about 160 miles of range and let me drive for another 2 hours before stopping." [But, of course, this is all handled by navigation so you don't really need to do any of these calculations, but just conceptually for a trip it's nice to think about stuff like "20 minute stop is about 2.5 hours of driving, 40 minute stop is about 4 hours of driving.]

very well said dummyhead.

????

 

[Macgreiner]

Well, this string went a direction I wasn't't prepared for.

 

[Woodrick]

So much unnecessary nastiness in this thread. Yall don't have to be calling each other dummyheads because they choose to think about charging and mileage differently than you. Be better.

The reason I prefer to think only in terms of kW and kWh is that the conversion to miles involves unknown variables. What's the temp, how heavy is your foot, are you towing, are you going up hill both ways...

120 @ 12 Amps is 1.3 kW. Charging for an hour is 1.3 kWh, which is about 1% battery (123 kWh in the CT).

240 @ 32 Amps is 7.7 kW. Charging for an hour is 7.7 kWh, which is about 16% battery.

Close, but not quite right. It' much more obvious at 120V, but there is a basic overhead that the vehicle uses to stay awake while charging, it's about 400W. That's what it costs to keep the vehicle awake.
You end up putting in less than 1 kWh in the battery. Which is the equivalent of about 2 miles range added per hour.

In the Tesla cars, the number is between about 4 and 5 mph, because they take about hald the power per mile. (200W vs 400W)

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