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Old 07-11-2008, 08:28 PM   #1
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How many watts does my well pump have?


How do you figure watts with a 230v motor?

I'm trying to figure the monthly cost to run this pump at 2 hours per day. Power company charges .087 per KWH

Another question while I'm here: One leg pulls 9.4 amps and the other leg pulls 7.8, is this normal?


Last edited by diyjet52; 07-11-2008 at 08:48 PM.
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Old 07-11-2008, 09:11 PM   #2
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How many watts does my well pump have?


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How do you figure watts with a 230v motor?
How many HP?




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Another question while I'm here: One leg pulls 9.4 amps and the other leg pulls 7.8, is this normal?
Absolutely NOT. If this is a straight 240v load either there is a problem with the motor, or there is an unsafe 120v load attached to the 240v circuit.

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Old 07-11-2008, 09:58 PM   #3
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How many watts does my well pump have?


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How many HP?




Absolutely NOT. If this is a straight 240v load either there is a problem with the motor, or there is an unsafe 120v load attached to the 240v circuit.

2 HP......
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Old 07-11-2008, 10:11 PM   #4
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How many watts does my well pump have?


Yes.
Can you post a schematic of how you think this is wired?
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Old 07-11-2008, 10:21 PM   #5
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How many watts does my well pump have?


it is 1,492 Watts so 1492*2=2984 Watts per day so 2984/1000=2.984 Kilowatts per day 2.984*31=92.504 Kwh per month 92.504*.087=$8.05 per month at most.
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Old 07-11-2008, 11:23 PM   #6
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How many watts does my well pump have?


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Yes.
Can you post a schematic of how you think this is wired?
For right now the best I can do is describe the wiring:

The pump motor is fed from a branch circuit from my garage. It's on a 20 amp 240 breaker. Both hots go straight from the breaker to the motor. Ground is grounded at the panel then attached to a screw under the wiring cover on the motor.

Another note: I swapped the wires on the motor and re-checked amps at the panel. Nothing changed, still pulling an amp higher on the same wire. Does that rule out the motor as a problem?

After Speedy petey mentioned I have a problem I went and checked all other 240 v motors around the house (ac compressor, dryer, welder). They all varied about an amp difference between legs. I'm thinking this might be normal. Maybe my $3.99 "tool sale" amp meter is broke.

The pump motor is almost new, it only has a few hours on it. It's a Goulds.

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Old 07-11-2008, 11:25 PM   #7
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How many watts does my well pump have?


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it is 1,492 Watts so 1492*2=2984 Watts per day so 2984/1000=2.984 Kilowatts per day 2.984*31=92.504 Kwh per month 92.504*.087=$8.05 per month at most.
Thanks,

I found a Usage calculator, I just wasn't sure on how many Watts to enter. Here's the link:

http://www.electricity-usage.com/Ele...alculator.aspx
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Old 07-12-2008, 06:23 AM   #8
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How many watts does my well pump have?


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After Speedy petey mentioned I have a problem I went and checked all other 240 v motors around the house (ac compressor, dryer, welder). They all varied about an amp difference between legs. I'm thinking this might be normal. Maybe my $3.99 "tool sale" amp meter is broke.
I think you may have found the issue.
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Old 07-12-2008, 09:27 AM   #9
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How many watts does my well pump have?


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I think you may have found the issue.
Are the amp meter at lowes worth getting? If not what's a good brand to get without going bankrupt?
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Old 07-12-2008, 09:45 AM   #10
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How many watts does my well pump have?


The extra amp might be found going into the neutral, and this might be OK according to the NEC. Otherwise there might be other current paths.

I would pursue this problem until you're satisfied you've accounted for all the readings, more for safety than for motor lifetime.
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Old 07-12-2008, 11:42 AM   #11
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How many watts does my well pump have?


I would not consider a 1 amp difference on a motor reading as a problem.
Motors are induction loads and all motors are not created equally. One extra turn of magnet wire at the factory is all it would take for the imbalance. If your meter has a ohm scale, measure the motor windings. The ohm readings should reflect the variation in current. Put another way, the ohm readings will not be the same, just as the current reading is not the same.
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Old 07-12-2008, 12:03 PM   #12
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How many watts does my well pump have?


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The extra amp might be found going into the neutral, and this might be OK according to the NEC. Otherwise there might be other current paths.

I would pursue this problem until you're satisfied you've accounted for all the readings, more for safety than for motor lifetime.
You're right, the neutral wire has about 1.3 amps on it. You're saying this is ok? Doesn't make a whole lot of sense to me, I never would have thought to check the neutral.

Man, this thread has done made me about 15% more smarter
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Old 07-12-2008, 01:02 PM   #13
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How many watts does my well pump have?


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The extra amp might be found going into the neutral, and this might be OK according to the NEC.
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You're right, the neutral wire has about 1.3 amps on it. You're saying this is ok? Doesn't make a whole lot of sense to me, I never would have thought to check the neutral.
WHAT neutral??? A 230v circuit for a motor does NOT have a neutral nor does it need one.

Is there a neutral run with the two hot conductors?
Is anything else on this circuit?

We still do not have all the correct information.
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Old 07-12-2008, 01:16 PM   #14
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How many watts does my well pump have?


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WHAT neutral??? A 230v circuit for a motor does NOT have a neutral nor does it need one.

Is there a neutral run with the two hot conductors?
Is anything else on this circuit?

We still do not have all the correct information.
I measured the 1.5 amps on the main neutral wire in the panel. I had all other breakers turned off.

I'm getting ready to run out to lowes, let me check it all again with a good amp probe and i'll get back to you.
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Old 07-12-2008, 01:57 PM   #15
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How many watts does my well pump have?


Is there a neutral run to the pump? If so WHERE is is connected?

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