I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

If you really want to know the real numbers, rather than theoretical
book numbers, which are next to useless, you can buy clamp-on amp meters
for really cheap now. Then you would need an extension cord, where you
(carefully!!) split the wires, leaving both insulated, so that one could
be clamped around. These amp meters only work if one of the wires are
clamped. If you use an extension cord, you can use it for all sorts of
things around the house to see what they use too.

I was really surprised at how cheap these amp meters have gotten to be.
They are accurate, too. I took one over to a certifying lab and they
wanted to test it for free on a lark cause they couldn't believe
anything that cheap would be worth a damn. Not many years ago, they cost
hundreds, now they are down to $20 or so from he
http://www.harborfreight.com/cpi/cta...emnumber=42397

"Joe" wrote in message
...
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

Put a low value resistor in the neutral lead and measure the volt drop, if
its an AC supply and the fan is an inductive load this won't be exactly
accurate - but probably close enough.

Joe wrote in message

....
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

With nothing much , other than clocks on in the house , take a reading on
the billing consumption meter and then 10 minutes later. Then time for 10
minutes each of the 3 settings and consequential consumption readings

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan

http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts

wrote:
On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan

http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts

This is the next to useless number I mentioned in my post. It is the
theoretical maximum amount based on the theoretical voltage. In the
field, voltage can vary and so can the usage. I know it sounds nutty,
but I've seen variations of more than 15% from the theory and that, to
me, is unacceptable.

On Tue, 17 Jul 2007 21:46:33 GMT, Vey wrote:

wrote:
On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan

http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts

This is the next to useless number I mentioned in my post. It is the
theoretical maximum amount based on the theoretical voltage. In the
field, voltage can vary and so can the usage. I know it sounds nutty,
but I've seen variations of more than 15% from the theory and that, to
me, is unacceptable.

If +/- 15 % is unacceptable then the clamp on ampmeter you suggested
from Harbor Freight would also be unacceptable.

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

For an actual measurement, you could plug it into one of
these meters:
http://www.supermediastore.com/kilwa...FSNFgQod3jdUtQ

wrote:
On Tue, 17 Jul 2007 21:46:33 GMT, Vey wrote:

wrote:
On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan
http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts
This is the next to useless number I mentioned in my post. It is the
theoretical maximum amount based on the theoretical voltage. In the
field, voltage can vary and so can the usage. I know it sounds nutty,
but I've seen variations of more than 15% from the theory and that, to
me, is unacceptable.

If +/- 15 % is unacceptable then the clamp on ampmeter you suggested
from Harbor Freight would also be unacceptable.

Don't assume. Buy it and test it like I did. The lab said +-3%. I
consider that to be acceptable. If you don't like those numbers, then
buy one for $300 and compare it to what you suggest the "book" numbers are.

John Popelish wrote:
Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how
many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

For an actual measurement, you could plug it into one of these meters:
http://www.supermediastore.com/kilwa...FSNFgQod3jdUtQ


Gee, if they are down to $20 that would be a good deal, too. Last I saw
them, they were at about $35-40 and I thought was a bit too much for
curiosity's sake.

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

Hi Joe...

It's going to continue to be a bit confusing... google lasko fan watts
and you'll find several entries that include comsumption.... but most
say 170 watts, one says 165 watts, and yet another 70 watts.

There must be a rating plate somewhere on the machine or motor,
though... isn't it a legal requirement?

Take care.

Ken

"Vey" wrote in message
nk.net...
Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how
many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

If you really want to know the real numbers, rather than theoretical book
numbers, which are next to useless, you can buy clamp-on amp meters for
really cheap now. Then you would need an extension cord, where you
(carefully!!) split the wires, leaving both insulated, so that one could
be clamped around. These amp meters only work if one of the wires are
clamped. If you use an extension cord, you can use it for all sorts of
things around the house to see what they use too.

I was really surprised at how cheap these amp meters have gotten to be.
They are accurate, too. I took one over to a certifying lab and they
wanted to test it for free on a lark cause they couldn't believe anything
that cheap would be worth a damn. Not many years ago, they cost hundreds,
now they are down to $20 or so from he
http://www.harborfreight.com/cpi/cta...emnumber=42397




There's much better solutions than that, especially for the novice.

http://www.amazon.com/P3-Internation...4721430&sr=8-1

I have one, it does a good job of measuring voltage, amperage draw,
volt-amps, power factor, watts, and cumulative kilowatt-hours.

"Vey" wrote in message
nk.net...
wrote:
On Tue, 17 Jul 2007 21:46:33 GMT, Vey wrote:

wrote:
On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan
http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts
This is the next to useless number I mentioned in my post. It is the
theoretical maximum amount based on the theoretical voltage. In the
field, voltage can vary and so can the usage. I know it sounds nutty,
but I've seen variations of more than 15% from the theory and that, to
me, is unacceptable.

If +/- 15 % is unacceptable then the clamp on ampmeter you suggested
from Harbor Freight would also be unacceptable.

Don't assume. Buy it and test it like I did. The lab said +-3%. I consider
that to be acceptable. If you don't like those numbers, then buy one for
$300 and compare it to what you suggest the "book" numbers are.


You still don't know what the power factor is with that route, a lot of
cheap motors are closer to 0.5 than to unity, so the calculated wattage can
be nearly double what the motor actually draws.

On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe

I have an older GE 20" window fan. It only has two speeds, but here are
the measurements:

Speed True watts Amps Volts Power Factor

Low 94 1.18 121.8 .6535

High 194 2.38 121.3 .672

Power was measured with a Yokogawa analog wattmeter; applied voltage and
current with a Fluke 189.

This power factor is probably typical for an induction motor of this size.

"Vey" wrote in message
ink.net...
wrote:
On Tue, 17 Jul 2007 21:04:05 GMT, (Joe) wrote:

Lasko Premium 20" three-speed box fan

http://www.amazon.com/gp/product/pro...4507&s=kitchen

170 watts

This is the next to useless number I mentioned in my post. It is the
theoretical maximum amount based on the theoretical voltage. In the field,
voltage can vary and so can the usage. I know it sounds nutty, but I've
seen variations of more than 15% from the theory and that, to me, is
unacceptable.

If its a ventilation fan exposed to the great outdoors, wind direction could
easily account for a 15% variation in power draw.

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe
I have a 20" Lasko in front of me at the moment. My Kill-A-Watt says

99/136/196 watts
129/175/248 volt-amps
at 121 volts

And no, there is no electrical info plate or marking on any of several
of these cheapie box fans that I own.

Bill Jeffrey

In article , Bill Jeffrey
wrote:

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe
I have a 20" Lasko in front of me at the moment. My Kill-A-Watt says

99/136/196 watts
129/175/248 volt-amps
at 121 volts

And no, there is no electrical info plate or marking on any of several
of these cheapie box fans that I own.

Bill Jeffrey

Thanks a lot, Bill. Is your Lasko a model 3723? That's the one I have
(two of, actually).

Also, I went to the Kill-A-Watt web site. It looks like you can't measure
any appliance running at 220 volts, correct?

I have a wall A/C unit in my apartment that plugs into a 220 outlet. I
read somewhere that even a fairly small one of these units uses 3500
watts. I imagine that the 3500 is only when the A/C is running the
compressor. So the average wattage would depend greatly on the outside
temperature, I would think.

--- Joe

Also, I went to the Kill-A-Watt web site. It looks like you can't measure
any appliance running at 220 volts, correct?

I have a wall A/C unit in my apartment that plugs into a 220 outlet. I
read somewhere that even a fairly small one of these units uses 3500
watts. I imagine that the 3500 is only when the A/C is running the
compressor. So the average wattage would depend greatly on the outside
temperature, I would think.


I have the UK version which is not even branded, but looking at it, it's
obviously internally identical to the Kill-A-Watt. It's designed for 240V
but works fine all the way down to 60V so I suspect the 120V model will work
on 240V but have not opened one up to compare. At any rate the power supply
is a simple capacitor and zener arrangement so it would be easy enough to
modify with a lower value capacitor if the zener heats up too much on 240.
If in doubt, it shouldn't be too hard to get the UK model and build some
plug adapters as I did, back before it was widely available in the US.

I used mine to measure the draw of my 3 ton (36,000 BTU) central AC and
found that the outdoor unit draws about 3500W with a power factor of 0.91.
You're correct that current draw varies with head pressure which varies with
outdoor ambient temperature. I doubt your window AC is bigger than 1 ton, so
even with the indoor fan, I'd be shocked to see it drawing more than 2KW and
really it's probably closer to 1200W.

Joe wrote:
In article , Bill Jeffrey
wrote:

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko website.

Googling gets me wildly disparate numbers on wattage for "portable" fans.

Does anyone have reasonably accurate info? It would be nice to know how
many watts for each of the three speeds.

Thanks.

--- Joe
I have a 20" Lasko in front of me at the moment. My Kill-A-Watt says

99/136/196 watts
129/175/248 volt-amps
at 121 volts

And no, there is no electrical info plate or marking on any of several
of these cheapie box fans that I own.

Bill Jeffrey

Thanks a lot, Bill. Is your Lasko a model 3723? That's the one I have
(two of, actually).

Also, I went to the Kill-A-Watt web site. It looks like you can't measure
any appliance running at 220 volts, correct?

I have a wall A/C unit in my apartment that plugs into a 220 outlet. I
read somewhere that even a fairly small one of these units uses 3500
watts. I imagine that the 3500 is only when the A/C is running the
compressor. So the average wattage would depend greatly on the outside
temperature, I would think.

--- Joe

Hey, I found the "electrical info plate" on the Lasko. It was stamped
into the sheet metal on the bottom of the fan. After being stamped, the
sheet metal was painted, which obscured the stamped info so completely
that the only way I can see it only with a bright light held at an
angle. As near as I can tell, it says
"Model 3723 (last two digits very unclear, could be almost anything)
Style EC437 (again very unclear)
Type 1
E20739
Listed 154C (UL symbol)
120v 2.2amp 60hz
1922.91"

Bill

Having some issues with the landlord over your utility charges?

FBt

Bill Jeffrey wrote:
Joe wrote:
In article , Bill Jeffrey
wrote:

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know
how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable"
fans.

Does anyone have reasonably accurate info? It would be nice to know
how
many watts for each of the three speeds.

Thanks.

--- Joe
I have a 20" Lasko in front of me at the moment. My Kill-A-Watt says

99/136/196 watts
129/175/248 volt-amps
at 121 volts

And no, there is no electrical info plate or marking on any of
several of these cheapie box fans that I own.

Bill Jeffrey

Thanks a lot, Bill. Is your Lasko a model 3723? That's the one I have
(two of, actually).

Also, I went to the Kill-A-Watt web site. It looks like you can't
measure
any appliance running at 220 volts, correct?

I have a wall A/C unit in my apartment that plugs into a 220 outlet. I
read somewhere that even a fairly small one of these units uses 3500
watts. I imagine that the 3500 is only when the A/C is running the
compressor. So the average wattage would depend greatly on the outside
temperature, I would think.

--- Joe

Hey, I found the "electrical info plate" on the Lasko. It was stamped
into the sheet metal on the bottom of the fan. After being stamped, the
sheet metal was painted, which obscured the stamped info so completely
that the only way I can see it only with a bright light held at an
angle. As near as I can tell, it says
"Model 3723 (last two digits very unclear, could be almost anything)
Style EC437 (again very unclear)
Type 1
E20739
Listed 154C (UL symbol)
120v 2.2amp 60hz
1922.91"

Bill

120v 2.2amp = 264 watts

Compare that to the wattage you measured ( 99/136/196 watts) and you
can see why I said that whatever the plate says is not very accurate.

On Thu, 19 Jul 2007 22:41:08 GMT, Vey wrote:

Bill Jeffrey wrote:
Joe wrote:
In article , Bill Jeffrey
wrote:

Joe wrote:
I have a Lasko Premium 20" three-speed box fan. I'd like to know
how many
watts it uses, but so far I can't find any good info.

No wattage info on the box or the fan, no wattage info on the Lasko
website.

Googling gets me wildly disparate numbers on wattage for "portable"
fans.

Does anyone have reasonably accurate info? It would be nice to know
how
many watts for each of the three speeds.

Thanks.

--- Joe
I have a 20" Lasko in front of me at the moment. My Kill-A-Watt says

99/136/196 watts
129/175/248 volt-amps
at 121 volts

And no, there is no electrical info plate or marking on any of
several of these cheapie box fans that I own.

Bill Jeffrey

Thanks a lot, Bill. Is your Lasko a model 3723? That's the one I have
(two of, actually).

Also, I went to the Kill-A-Watt web site. It looks like you can't
measure
any appliance running at 220 volts, correct?

I have a wall A/C unit in my apartment that plugs into a 220 outlet. I
read somewhere that even a fairly small one of these units uses 3500
watts. I imagine that the 3500 is only when the A/C is running the
compressor. So the average wattage would depend greatly on the outside
temperature, I would think.

--- Joe

Hey, I found the "electrical info plate" on the Lasko. It was stamped
into the sheet metal on the bottom of the fan. After being stamped, the
sheet metal was painted, which obscured the stamped info so completely
that the only way I can see it only with a bright light held at an
angle. As near as I can tell, it says
"Model 3723 (last two digits very unclear, could be almost anything)
Style EC437 (again very unclear)
Type 1
E20739
Listed 154C (UL symbol)
120v 2.2amp 60hz
1922.91"

Bill

120v 2.2amp = 264 watts

This is not watts; it's volt-amps.


Compare that to the wattage you measured ( 99/136/196 watts)

You should compare it to the volt-amps he measured. Then it's not so far
off.

and you
can see why I said that whatever the plate says is not very accurate.

You are making a mistaken assumption. If you measure the current draw
(amps) and the applied voltage separately, and multiply them, you get the
(real) watts consumed *only* if the load is a pure resistance. If the load
has a reactive component (inductance or capacitance; in this case the motor
is an inductive load), then the product of volts and amps is the "apparent
power" (volt-amps), not the "real power". See:
http://en.wikipedia.org/wiki/Power_factor

An incandescent light bulb, electric stove, electric toaster or electric
blanket would be an example of a pure resistance load. Most household
equipment other than heating devices, if they have motors (refrigerator,
for example) or non-PF corrected power supplies (older computer or
television) will have a power factor of less than 1, and will require a
special type of meter (a wattmeter) to measure their real power consumption
(because the load has a so-called "wattless" component):
http://en.wikipedia.org/wiki/Wattmeter

As they say on that page, "On an ac circuit the deflection is
proportional to the average instantaneous product of voltage and current,
thus measuring true (real--my addition) power, and possibly (depending on
load characteristics) showing a different reading to that obtained by
simply multiplying the readings showing on a stand-alone voltmeter and a
stand-alone ammeter in the same circuit."

Go back and look at Bill's earlier post where he gives the result of his
actual measurements:

"99/136/196 watts
129/175/248 volt-amps
at 121 volts"

You'll see that volt-amps and watts are substantially different. This is
the beauty of the Kill-A-Watt. It measures both the apparent power and the
true power. The apparent power (the product of separately measured amps
and volts, remember) will be larger than the true power with a fan motor
load, but the true power reading is what you pay for on your electric bill
(if you're a typical residential customer). Large industrial customers pay
a penalty if the apparent power they consume is larger than the true power,
but ordinary residences don't.