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Posted by saleem on March 24, 2007, 3:39 am
hi all,
I have a general question about the first what s KVA what actually it
is, second what s WATT and which one is the basic thing to know when
bying the generator /
thanks
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Posted by RBM on March 24, 2007, 7:43 am
Generators will be rated in KW or 1000 watts, so 6KW = 6000 watts
watts = volts x amps
> hi all,
>
> I have a general question about the first what s KVA what actually it
> is, second what s WATT and which one is the basic thing to know when
> bying the generator /
>
> thanks
>
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Posted by HeyBub on March 24, 2007, 9:09 am
saleem wrote:
> hi all,
>
> I have a general question about the first what s KVA what actually it
> is, second what s WATT and which one is the basic thing to know when
> bying the generator /
>
> thanks
For practical purposes, a KVA = 1000 watts. There is some difference in
power factors for KVA and KW when discussing AC vs DC, but it shouldn't
concern you.
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Posted by gerry on March 24, 2007, 1:56 pm
[original post is likely clipped to save bandwidth]
wrote:
>saleem wrote:
>> hi all,
>>
>> I have a general question about the first what s KVA what actually it
>> is, second what s WATT and which one is the basic thing to know when
>> bying the generator /
>>
>> thanks
>
>For practical purposes, a KVA = 1000 watts. There is some difference in
>power factors for KVA and KW when discussing AC vs DC, but it shouldn't
>concern you.
Absolutely FALSE except for resistive loads (standard light bulbs,
electric heaters...)
DC DOES NOT have a power factor and VA = Watts, why mention it???
gerry
--
Personal home page - http://gogood.com
gerry misspelled in my email address to confuse robots
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Posted by gerry on March 24, 2007, 9:58 am
[original post is likely clipped to save bandwidth]
wrote:
>hi all,
>
>I have a general question about the first what s KVA what actually it
>is, second what s WATT and which one is the basic thing to know when
>bying the generator /
>
>thanks
There is a big difference between the two! To fully understand it, one
needs to understand imaginary versus real power. That is, understand
imaginary numbers. But the effect can be conveyed in less than
technically correct ways.
On many devices, Voltage an Amperage is not in phase. Motors, computers,
florescent lights.... That is peaks of each do not occur at the same
time. A crude diagram might be:
/\ /\ /
/ \ / \ /
\ / \ / Voltage
\/ \/
/\ /\ /
/ \ / \ / Amperage (note peaks at a different time)
/ \ / \ /
\/ \/
VA is simply multiplying the voltage magnitude times the amperage
magnitude. This makes sense for a generator since it outputs a certain
voltage and has a maximum current rating.
Actual wattage factors in the phase difference between the voltage and
amperage. It is the average of the instant power at any moment in time.
Since the Voltage and Amperage do not peak at the same time on many
loads, the wattage is less than VA.
Wattage represents real power, the power of the generator's energy. So
many HP can do just so much work. Thus for a given HP engine, the
generator is wattage limited.
The wiring is also amperage limited, usually higher than that of the
rated wattage of the generator. Thus a generator can output a higher VA
(wiring limited) than wattage (engine limited).
Hope this helps
gerry
--
Personal home page - http://gogood.com
gerry misspelled in my email address to confuse robots
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