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Thread: Measuring whole house watts for generator

  1. #21
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    Quote Originally Posted by heatingman View Post
    How does the wattmeter account for imbalance between L1 and L2 - IE more 120v load on one line?

    I always thought watts for a split phase panel was

    Watts = volts x (L1 amps + L2 amps / 2)


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    It doesn't, AFAIK. The KWs were slightly higher when I switched to 'L2'.

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    Thought this might be of interest. This guy measures amps of the compressor with HSK, without, and then with a softstart, which reduces the start amps significantly and, according to some, extends the life of the compressor. Very pricey though.

    Last edited by vin lashon; 06-27-2022 at 01:30 PM.

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  4. #23
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    Quote Originally Posted by vin lashon View Post
    Thought this might be of interest. This guy measures amps of the compressor with HSK, without, and then with a softstart, which reduces the start amps significantly and, according to some, extends the life of the compressor. Very pricey though.

    That basic test has been done by many people. thats why I say a hard start doesn't reduce inrush it just changes the duration and often changes the reading that a meter that takes a timed snapshot amp reading shows but I soft start (not a grenade/ptcr) actually reduces it.
    "Is this before or after you fired the parts cannon at it?" - senior tech
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    Unless we change direction we are likely to end up where we are going.
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    Quote Originally Posted by R600a View Post
    That basic test has been done by many people. thats why I say a hard start doesn't reduce inrush it just changes the duration and often changes the reading that a meter that takes a timed snapshot amp reading shows but I soft start (not a grenade/ptcr) actually reduces it.
    I bet @Jayman could be coaxed into a video with some of his testing equipment
    If I do a job in 30 minutes it's because I spent 30 years learning how to do that in 30 minutes. You owe me for the years, not the minutes.

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  7. #25
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    Quote Originally Posted by STEVEusaPA View Post
    I bet @Jayman could be coaxed into a video with some of his testing equipment
    I think he might have already posted a video on some aspect of that.
    "Is this before or after you fired the parts cannon at it?" - senior tech
    I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
    Unless we change direction we are likely to end up where we are going.
    "It's not new, it's better than new!" Maru.

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  9. #26
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    What kind of contactor is in that unit?


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    Quote Originally Posted by heatingman View Post
    What kind of contactor is in that unit?


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    The one in the video is an Emerson sure switch.
    "Is this before or after you fired the parts cannon at it?" - senior tech
    I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
    Unless we change direction we are likely to end up where we are going.
    "It's not new, it's better than new!" Maru.

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  12. #28
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    Quote Originally Posted by heatingman View Post
    What kind of contactor is in that unit?
    https://climate.emerson.com/en-us/sh...:&facetRange:&

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    Are those common? Never seen one, and Im exposed to all sorts of system types and sizes.

  14. #30
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    Quote Originally Posted by heatingman View Post
    Are those common? Never seen one, and Im exposed to all sorts of system types and sizes.
    Sounds like you answered your own question.
    I want to run one on my system but I don't want to spend the money.
    "Is this before or after you fired the parts cannon at it?" - senior tech
    I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
    Unless we change direction we are likely to end up where we are going.
    "It's not new, it's better than new!" Maru.

  15. #31
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    Quote Originally Posted by heatingman View Post
    Are those common? Never seen one, and Im exposed to all sorts of system types and sizes.
    Definitely not common. I've never seen one in the wild and haven't found a need to use one for it's stated purposes - keeping out ants and other debris.

    It's like $50 for a 30 amp rated contactor. I suppose if your 2 ton unit is oversized and cycling enough to wear out a properly sized or larger definite purpose contactor, then maybe the 5x contact life would be worth it.

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  16. #32
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  17. #33
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    Quote Originally Posted by R600a View Post
    Sounds like you answered your own question.
    I want to run one on my system but I don't want to spend the money.
    Just install a mercury contactor, if you have the room, and never look back…mines 25+ years, no issues.
    I'm not young enough, to know everything...

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  19. #34
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    Quote Originally Posted by dieseldude View Post
    Just install a mercury contactor, if you have the room, and never look back…mines 25+ years, no issues.
    I was mixed up. I thought he was referring to a soft start. I thought about using a sure switch but it's too much electronics integrated into a simple part and I picture it going down after a thunderstorm where it would otherwise have been fine. Id rather use a mercury contactor or just replace the contactor every 10 years and treat the ants regularly.
    "Is this before or after you fired the parts cannon at it?" - senior tech
    I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
    Unless we change direction we are likely to end up where we are going.
    "It's not new, it's better than new!" Maru.

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