EVDRIVER
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- Apr 24, 2010
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nerys said:Define power
Define energy
Please
These things have been repeatedly defined correctly by other posters above. But here goes:nerys said:I agree with your definition ofnpower and energy
I think you have the kw terms backwards.
Of course i could be wrong. Documentation on your link to kw and kwh please.
Note that it has nothing whatever to do with kW "per" hour. It is kilowatts "times" hours.The kilowatt hour, or kilowatt-hour, (symbol kWh, kW·h, or kW h) is a unit of energy equal to 1,000 watt-hours, or 3.6 megajoules.
The kilowatt is equal to one thousand (10³) watts...This unit is typically used to express the output power of engines and the power of electric motors, tools, machines, and heaters...One kilowatt is approximately equal to 1.34 horsepower.
No. 20kWh a daynerys said:Yes a watt is an amount of power. This is not hard stuff here.
A 1000watt bulb only consumes 1000watts if you run it for 1 hour.
This is not really rocket science. Lets say you want to solar offset you car. 20kw a day.
No. You need 20kWh. Which means you need a system that will produce 20kWh during that 10 hours of sunlight. Since the solar production will vary over the course of that 10 hours, you will need a system with a peak output of considerably more than 2kW.10 hours sunlight.
You dont need 3.3kwh. You need 2kwh.
More correctly, 2kw sustained for 10 hours would net you 20kwH. But solar doesn't work like that, as I pointed out above. This is an example of why it's important to know how these terms work. kW is an instantaneous rate. To plan and achive the desired output you need to plot that instantaneous rate over time, for various seasons, and integrate the areas under those curves. For example, what is the day's output for the system below, on Jan 1? The area under that blue curve represents kWH. Even though the peak output on Jan 1 is about 2kW, the total for that day is nowhere near 20kWh.2kw per hour times 10 hours nets you 20kw total produce power.
nerys said:2kw per hour times 10 hours nets you 20kw total produce power.
More correctly, 2kw sustained for 10 hours would net you 20kwH.
nerys said:there is no more correctly. you said PRECISELY the same thing just mixed up the words.
per hour times 10 hours IS EXACTLY THE SAME THING as 2kw sustained for 10 hours. there is NO difference at all in any way shape or form in those sentences as far as meaning is concerned.
nerys said:SO maybe this is where I am confused.
I say 2+2=4
you say no more correctly 1+1+1+1=4
in my view we said EXACTLY the same thing.
nerys said:why am I wrong why is your description "more" correct? (I am IGNORING the variability of solar it was just an example)
MIND you. I KNOW I am wrong. but knowing I am wrong means nothing to me. I need to understand "WHY" I am wrong or whats in my head is simply not going to change (which is why this is annoying
nerys said:2kw per hour times 10 hours nets you 20kw total produce power.
there is no more correctly. you said PRECISELY the same thing just mixed up the words.Nubo said:More correctly, 2kw sustained for 10 hours would net you 20kwH.
...
MIND you. I KNOW I am wrong. but knowing I am wrong means nothing to me. I need to understand "WHY" I am wrong or whats in my head is simply not going to change (which is why this is annoying
jlv said:Please get your nomenclature correct. These are scientific units with specific abbreviations: watts is a capital W; kilowatts is kW, and kilowatt-hours is kWh. They have well defined meanings: http://www.rapidtables.com/electric/kWh.htm" onclick="window.open(this.href);return false;
A post with "w", "kw", or "kwh" indicates the person who wrote it probably doesn't know what they are talking about.
Or that they were too lazy to use the shift key. In which case, I doubt the accuracy of their post, since if they were lazy about that, I wonder how lazy they are with facts!Nubo said:Probably.jlv said:A post with "w", "kw", or "kwh" indicates the person who wrote it probably doesn't know what they are talking about.
jlv said:Or that they were too lazy to use the shift key. In which case, I doubt the accuracy of their post, since if they were lazy about that, I wonder how lazy they are with facts!Nubo said:Probably.jlv said:A post with "w", "kw", or "kwh" indicates the person who wrote it probably doesn't know what they are talking about.
I beg to differ. See bumperplugs.com Search for Nissansmkettner said:Best way to cover those holes is with a license plate holder.
alanpozner said:I beg to differ. See bumperplugs.com Search for Nissansmkettner said:Best way to cover those holes is with a license plate holder.
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