EV CHARGING AND FUSE

[SUNRAY]

Yes I got the impression that their weights and measures tend to short changing us and their billions etc tend to exaggerate.
Couple that with an attempt to "monetarise" everything going and allowing Fleabay trading and misspelling/mispronouncing a lot of stuff.
It all leads to a poor view of them as traders you can trust.
I will not mention their political candidates, ours are bad enough but theirs ? Phew!
They did get the first man to the moon and they are quite good at computers, although they do get times and dates all jumbled up and claim to have won many WW2 battles they did not attend.
But hey ho I suppose they not all as bad as they want us to believe, well not quite all of them anyway.

Ahhhh but someone is single handedly f*****g them up making them great again

 

[securespark]

Anyone who wants the history of it:

Comparison of the imperial and US customary measurement systems - Wikipedia https://share.google/SpT1oFHe7m3GyejQq

 

[robinbanks]

That was exactly my point when I used the word "about"

And my point is "a kilobyte is a 1000 bytes. A kibibyte is 1024 bytes. Regardless of whether is has ever been correct to use kilobyte to mean 1024 bytes, you should not use this one errant example as evidence that the definition of kilo is flexible to the point that there may be something other than 1000 grams in a kilogram"

So in a nutshell you admit that you have (deliberately) misrepresented what I stated in order that you might argue against it.

You said:

kWh in an hour - NOT kW

How else would you like someone to interpret this than as a statement that "kWh per hour isn't the same as kW"?

 

[TAMD8389]

thanks for the people who tried to help me

 

[Risteard]

And my point is "a kilobyte is a 1000 bytes. A kibibyte is 1024 bytes. Regardless of whether is has ever been correct to use kilobyte to mean 1024 bytes, you should not use this one errant example as evidence that the definition of kilo is flexible to the point that there may be something other than 1000 grams in a kilogram"


You said:

kWh in an hour - NOT kW

How else would you like someone to interpret this than as a statement that "kWh per hour isn't the same as kW"?

It's not. There's no such thing as kW per hour, but you absolutely can add x number of kWh per hour of charging. Stop gaslighting.

 

[morqthana]

My personal hates are ... any yellow, really

I'm going to be really controversial next. I've always hated white because it shows the dirt so easily.

Not as bad as black.

 

[robinbanks]

There's no such thing as kW per hour

Sure there is. I already tried to explain it. It relates to changing power. "This charger is 100kW but it doesn't turn that on all at once, it slowly increases the power offered over time, and the rate of change is 25kW/hour. If you set it going now, in 4 hours' time it will be at full power"

Though kW per hour is a valid descriptor of something, it is not a valid descriptor of anything here

But that's OK. Your words were "kWh per hour", not "kW per hour"

You absolutely can add x number of kWh per hour of charging

Yep. Never said you couldn't. A charger that adds 22kWh of fuel to a car, per hour, is a 22kW charger.

Remember, your words were "kWh in an hour - NOT kW" and I merely pointed out they were the same thing. Here we are, N posts later you still playing fast and loose with units, twisting things for reasons I cannot fathom

Stop gaslighting

Gas lights are fossil fuel based. This discussion is entirely about the next generation of motive fuel


Let's have a recap

kWh - an amount of energy
kW - a rate of flow of energy
kWh/h - a rate of flow of energy. No one talks about this in charge terms, they just say kW instead
kW/h - a rate of change of a rate of flow of energy. No one talks about this in charger terms, but they could

 

[EFLImpudence]

Sure there is. I already tried to explain it. It relates to changing power. "This charger is 100kW but it doesn't turn that on all at once, it slowly increases the power offered over time, and the rate of change is 25kW/hour. If you set it going now, in 4 hours' time it will be at full power"

Is that "a thing"?

Though kW per hour is a valid descriptor of something,

What?

Or are you using "per" incorrectly?

it is not a valid descriptor of anything here

Nor anywhere else.

 

[morqthana]

Sure there is. I already tried to explain it. It relates to changing power. "This charger is 100kW but it doesn't turn that on all at once, it slowly increases the power offered over time, and the rate of change is 25kW/hour. If you set it going now, in 4 hours' time it will be at full power"

Is that "a thing"?

I believe it is, in the other direction, i.e. reducing a rate of charge, for high-speed DC EV chargers, which reduce the rate of charge as the battery fills up.

I don't know if they do that gradually, or in one discrete step, or in a series of discrete steps, but conceptually describing the rate at which the charging rate changes as kW/h is perfectly valid.

Though kW per hour is a valid descriptor of something,

What?

He told you twice in the post which you have been quoting

It relates to changing power. "This charger is 100kW but it doesn't turn that on all at once, it slowly increases the power offered over time, and the rate of change is 25kW/hour. If you set it going now, in 4 hours' time it will be at full power"

kW/h - a rate of change of a rate of flow of energy.

it is not a valid descriptor of anything here

Nor anywhere else.

So - straightforward question for you:

In the MKS system, what would you say was the derived unit for rate of change of power?

 

[EFLImpudence]

Morq:

Rather than trying to look clever all the time, it might be preferable if you were to answer people's questions rather than reply with "He told you twice" when obviously I missed or disagreed with the definition.

In the MKS system, what would you say was the derived unit for rate of change of power?

I don't know - please tell me.

 

[EFLImpudence]

So - you are saying that 25kW/hour is an SI unit.

 

[ebee]

Some very interesting concepts here in this thread good people

 

[morqthana]

Rather than trying to look clever all the time,

I'm not - I'm just responding to posts and trying to be as clever as I can when doing so.

Just like I try to do everything as cleverly as I can.

it might be preferable if you were to answer people's questions rather than reply with "He told you twice"

That was an answer to your question "What?".

when obviously I missed or disagreed with the definition.

If you missed it you were at fault.

And "disagreeing" leads to my final Q to you.

I don't know - please tell me.

So you don't know what the derived unit for rate of change of power is, but you know it's not kW/h.

OK.

 

[morqthana]

So - you are saying that 25kW/hour is an SI unit.

SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate power of exponentiation

Velocity is measured in m/s

A Watt is 1 Joule/s

Velocity acceleration (i.e. rate of change of velocity) is m/s², i.e. m/s/s.

So why should rate of change of power not be J/s/s, i.e. W/s? Or kW/h when scaled appropriately?

 

[EFLImpudence]

So why should rate of change of power not be J/s/s, i.e. W/s? Or kW/h when scaled appropriately?

Because it isn't/doesn't/whatever?