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Is wattage comparable between electrical devices?

Its not a stupid question for people who don't understand electrical terms.

Is 120 volts comparable?
Is AC comparable to DC?
Is 1 Amp comparable?

Not everybody knows this stuff.
 
The 100W figure is for a fully loaded pump motor. The only way to tell how much load is on the motor is to use a clamp on ammeter and measure the amperage. Since it will not exceed 100W then it should always be LOWER than 1/10 kWh consumption that a 100W light bulb uses.
 
Originally posted by: Rubycon
The 100W figure is for a fully loaded pump motor. The only way to tell how much load is on the motor is to use a clamp on ammeter and measure the amperage. Since it will not exceed 100W then it should always be LOWER than 1/10 kWh consumption that a 100W light bulb uses.
Click to expand...

I have a question for you:

The spec sheet says that it's 115 volts and 1.5 amps. Then it says the wattage is 100 watts.

Shouldn't 115x1.5= 172.5 watts?
 
Originally posted by: 91TTZ
Originally posted by: Rubycon
The 100W figure is for a fully loaded pump motor. The only way to tell how much load is on the motor is to use a clamp on ammeter and measure the amperage. Since it will not exceed 100W then it should always be LOWER than 1/10 kWh consumption that a 100W light bulb uses.
Click to expand...

I have a question for you:

The spec sheet says that it's 115 volts and 1.5 amps. Then it says the wattage is 100 watts.

Shouldn't 115x1.5= 172.5 watts?
Click to expand...

I'm gonna guess and say that it's the amp draw at startup. Motors can draw quite a bigger load when starting up.
 
Originally posted by: NL5
Originally posted by: 91TTZ
Originally posted by: Rubycon
The 100W figure is for a fully loaded pump motor. The only way to tell how much load is on the motor is to use a clamp on ammeter and measure the amperage. Since it will not exceed 100W then it should always be LOWER than 1/10 kWh consumption that a 100W light bulb uses.
Click to expand...

I have a question for you:

The spec sheet says that it's 115 volts and 1.5 amps. Then it says the wattage is 100 watts.

Shouldn't 115x1.5= 172.5 watts?
Click to expand...

I'm gonna guess and say that it's the amp draw at startup. Motors can draw quite a bigger load when starting up.
Click to expand...

Startup amperes is essentially the same as locked rotor amperes and it much higher.

1.5 x 120V = VA not watts. Wattage would be the product of VA and the power factor. The manufacture assumes a power factor of approximately .55 to give a wattage ~100W.

If this were a DC motor than the product of amperage and voltage would be the correct wattage. Loads that are power factor corrected with power factors approaching unity the same is true.
 
To find out the amount of kilowatt-hours, I would take

100W x 24 hours / 1000 = 2.4 kWh

To find the monthly cost, I would do

2.4 kWh x 30 days x (kWh rate)

Is that correct?
 
Originally posted by: her209
To find out the amount of kilowatt-hours, I would take

100W x 24 hours / 1000 = 2.4 kWh

To find the monthly cost, I would do

2.4 kWh x 30 days x (kWh rate)

Is that correct?
Click to expand...
Yup.


 
Little Giant pumps are sweet. They can be a bit noisy IMO, but they work well and (usually) last almost forever.

I did some searching and they've gotten a bit spendy since the last time I bought one.

This is the best price I found in a quick browsing of the sites I did business with when I was in the hobby:

http://www.drsfostersmith.com/...+4587+4614&pcatid=4614

(seems like everyone else was closer to $150 fot the same pump)
 
Originally posted by: her209
Cool thanks!

I guess the next question is, are there any other companies that manufacture a kWh monitoring device similar to this?
http://www.p3international.com...al/P4400/P4400-CE.html
Click to expand...

Harbor Freight sells KillAWatts as well as their own brand of knockoffs. Frys has these ethernet connected power monitors for quite a bit more: http://www.frys.com/product/57...sr:SEARCH:MAIN_RSLT_PG I believe they used to sell a version with USB only for quite a bit less.

 
Originally posted by: PottedMeat
Originally posted by: her209
Cool thanks!

I guess the next question is, are there any other companies that manufacture a kWh monitoring device similar to this?
http://www.p3international.com...al/P4400/P4400-CE.html
Click to expand...
Harbor Freight sells KillAWatts as well as their own brand of knockoffs. Frys has these ethernet connected power monitors for quite a bit more: http://www.frys.com/product/57...sr:SEARCH:MAIN_RSLT_PG I believe they used to sell a version with USB only for quite a bit less.
Click to expand...
I found this one:
http://www.harborfreight.com/c...m.taf?Itemnumber=65731
 
Originally posted by: BoomerD
Little Giant pumps are sweet. They can be a bit noisy IMO, but they work well and (usually) last almost forever.
Click to expand...
Are they pretty loud? Should I go with a different manufacturer?
 
Originally posted by: futuristicmonkey
Originally posted by: Engineer
The power may be the same at full load but the impedance (both real and apparent) will not be! 🙂
Click to expand...

Fixed for ya 😛
Click to expand...

I had thought about using the word impedance but figured that the light bulb was closer to pure resistance than impedance. The motor would include quite a bit of inductance (not sure of capacitance other than the starting capacitor) and would indeed be classified as impedence. Obviously, apparent power results from impedance! 😛
 
Originally posted by: BoomerD
Little Giant pumps are sweet. They can be a bit noisy IMO, but they work well and (usually) last almost forever.

I did some searching and they've gotten a bit spendy since the last time I bought one.

This is the best price I found in a quick browsing of the sites I did business with when I was in the hobby:

http://www.drsfostersmith.com/...+4587+4614&pcatid=4614

(seems like everyone else was closer to $150 fot the same pump)
Click to expand...

Iwaki/Walchem magnet drive pumps are better than Little Giant. 😉
 
Originally posted by: Rubycon
Originally posted by: BoomerD
Little Giant pumps are sweet. They can be a bit noisy IMO, but they work well and (usually) last almost forever.

I did some searching and they've gotten a bit spendy since the last time I bought one.

This is the best price I found in a quick browsing of the sites I did business with when I was in the hobby:

http://www.drsfostersmith.com/...+4587+4614&pcatid=4614

(seems like everyone else was closer to $150 fot the same pump)
Click to expand...
Iwaki/Walchem magnet drive pumps are better than Little Giant. 😉
Click to expand...
I looked at the Iwaki pumps and one that would even come close to what I want/need is the [W]MD-20R pumps.
 
30RLT would work for pressure. The motor unloads as head pressure increases so you can install a 3/4" ball valve on the discharge line and throttle your flow as needed.
 
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