EV Thread

[Eric]

30kW per hour

kW per hour
kW per hour
kW per hour
kW per hour

 

[Uwe]

The average home draws a peak of 30kW per hour...

Less. I've been doing a lot of monitoring using an IoTaWatt to see where my power is going. The absolute highest peaks I've seen in my pretty good-sized house are around 12kW, and that's with both A/C units (total of 5 tons / 60,000 BTUs) running, and simultaneous demand from electric water heater. Those peaks never last a whole hour either, 5-10 minutes or so. Average consumption over a 24h period is under 3.5 kW even on the hottest days. Here's a pretty warm day back in May:

So a 350 kW charger is more like the peak load of 30 homes rather than 10.

-Uwe-

 

[davisev5225]

kW per hour
... (etc.)

kW is a unit of energy (kilowatt), and is not the same thing as kWh (kilowatt-hours). No need to get pedantic. I did get one thing wrong, though, it is 30kW per day, not per hour.

Less. I've been doing a lot of monitoring using an IoTaWatt to see where my power is going. The absolute highest peaks I've seen in my pretty good-sized house are around 12kW, and that's with both A/C units (total of 5 tons / 60,000 BTUs) running, and simultaneous demand from electric water heater. Those peaks never last a whole hour either, 5-10 minutes or so. Average consumption over a 24h period is under 3.5 kW even on the hottest days.

(...)

So a 350 kW charger is more like the peak load of 30 homes rather than 10.

-Uwe-

That just makes it even worse per-vehicle!


Edit: And then the "green" idiots will try to say "we can make it up with renewables", thoroughly demonstrating their complete lack of not only education, but general intelligence as well.

 

[Eric]

kW is a unit of energy (kilowatt), and is not the same thing as kWh (kilowatt-hours). No need to get pedantic. I did get one thing wrong, though, it is 30kW per day, not per hour.

A little more than one thing. Where to start? (shakes head).
kW is a unit of power, not energy. First thing wrong.
kWh is a unit of energy. Not the same as kW, on this we agree
30kW per day makes as much sense as 30kW per hour. You'd be looking at an increase in power over time, let's first see if you can learn the difference between power and energy
I guess what you were trying to convey was that a house uses on average 30 kWh OF ENERGY per day?? Or was it as Uwe understood it that they have 1H POWER usage peaks of 30kW? See, those are two completely different things, none of which by the way are represented by "30kW per hour".

Yes I'm going to get all pedantic because I'm tired of reading posts about solar (some are questions, which is ok, but some are attempts at answers!) from people who don't seem to understand basic units and dimensions, and that power is not the same thing as energy.

 

[Uwe]

No need to get pedantic.

Don't worry, it's a service we offer at no extra cost!

it is 30kW per day, not per hour.

30 kWh / day sounds about right for an average house. I'm rarely less than that (and for sure not in the summer A/C season), but I've got a lot of computer & internet "base load" that runs 24x7.

That just makes it even worse per-vehicle!

Yes, it does. And to make matters worse, commercial and industrial users don't just pay the utility for kWh or energy they use; they also get hit with a "demand charge", which is typically based on the highest draw during any 15 minute period in a billing cycle. So if you're putting an a 350 kW EV charger and only charge one car a month, consuming say 100 kWh from the grid, which should cost under $20 (places with sane electric rates, probably double that in Cali) you'll also get hit with the demand charge, which if your peak draw really was the 350 kW the charger is capable of, will be hundreds of dollars.

-Uwe-

 

[davisev5225]

A little more than one thing. Where to start? (shakes head).

There you go getting pedantic again. For most laymen (of which I am definitely in that camp...), "power" and "energy" are the same thing. Yes, you are technically correct in that "power" is a rate measurement for "energy", which is the effective work output. The rest of what you yammered on about is lawyer-levels of nit-picking for what is effectively a surface-level discussion. I already corrected the relevant error (day vs hour).

 

[Uwe]

"power" and "energy" are the same thing.

That's like saying torque and horsepower are the same thing.

-Uwe-

 

[davisev5225]

which should cost under $20 (places with sane electric rates, probably double that in Cali)

I'll just leave this here.

That was from a $246 electric bill for one month. I want out of this hell-hole!

 

[davisev5225]

That's like saying torque and horsepower are the same thing.

For the layman... (which is the important qualifier here), they are. Just like for the layman... "power" and "energy" are the same thing.