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Which inverter do I need?

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  • Which inverter do I need?

    So I posted a thread earlier but I was mistaken about certain issues related to the amount of energy I was going to be using. I wanted to post here as the information in that thread was just too wrong and I didn't want the thread to get too convoluted. Hope that's cool.

    I am trying to run a pottery wheel that has a 100w DC motor but it plugs into an AC outlet (I guess it has a built in inverter? I've thought about rewiring so that I can plug it straight into my batter but I'd rather not mess with it). It is 1/3 hp and has variable speed.

    I know of one person running the same wheel off of a 93ah deep cycle battery with a 1000w inverter and can run it for up to 10 hours.... I'm going to have 2 6v 230ah batteries so am hoping for up to 20 hours of operation without sun. Anyways, what I am wondering is, do you think a 1000w inverter would be ok for this wheel + turning on my rv water pump + having a phone plugged in and charging? I am new to this stuff so am confused about the math... and I don't know how much energy a 100w dc motor like this can surge up to.

    Thanks for any help you might be able to provide me with!
    Kadin

  • #2
    Well none of your numbers make much sense.

    100 watt motor with average efficiency is roughly 1/8 Hp
    10 hours run time on a 12 volt motor 93 AH motor is roughly 10 watts or 1/80 HP

    FWIW 1 HP Electric Motor = 746 Watts at 100% efficiency which is not possible. At an extremely high 90% efficiency would be 828 watts. That is why your numbers do not jive. A 1/3 Hp motor would be around 300 watts.

    Anyway with a pair of golf cart batteries (6-volt 230 AH) will work and you will need at least a 300 watt Solar panel and a 25 amp MPPT charge controller to keep it charged. Yes a 1000 watt Inverter will be overkill, just make sure you get a True Sine Wave model. Do not buy 12 volt battery panels unless the $/watt is less than grid tied panels. Wire panels in series if more than one is used. Grid tied panels are much less expensive and much higher power. In fact you can get a 300 watt panel. Expect to pay around $200 for a good 25 amp MPPT controller. A pair of golf cart batteries will be around $300. If you shop around you can get a 300 watt GT panel for around $300 or rless or up to $600 if you use 12 volt battery panels. Whatever you do is DO NOT USE a PWM or cheap charge controller.
    Last edited by Sunking; 04-13-2018, 08:06 PM.
    MSEE, PE

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    • #3

      Thanks Sunking,

      They aren't my numbers... This is copied and pasted from the manufacturer of the Shimpo Aspire pottery wheel:

      MOTOR 100W DC
      HP 1/3 HP
      SPEED CONTROL Lever Handle
      WHEEL-HEAD 7
      Last edited by Kadin; 04-13-2018, 08:34 PM. Reason: My message keeps getting cut off for some reason

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      • #4
        Trying to make a full post but it keeps getting cut off for some reason... don't know whats wrong...

        Here is the end of the previous post... hopefully it shows up...

        7



        EDIT, ugh I give up... going to a different website

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        • #5
          Originally posted by Kadin View Post
          Trying to make a full post but it keeps getting cut off for some reason... don't know whats wrong...

          Here is the end of the previous post... hopefully it shows up...

          7



          EDIT, ugh I give up... going to a different website
          Because you are copying and pasting, and this site does not allow that. Look and I bet you will find it cuts off with punctuation marks.

          MSEE, PE

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          • #6
            Originally posted by Kadin View Post
            Thanks Sunking,

            They aren't my numbers... This is copied and pasted from the manufacturer of the Shimpo Aspire pottery wheel:

            MOTOR 100W DC
            HP 1/3 HP
            SPEED CONTROL Lever Handle
            WHEEL-HEAD 7
            I understand they are not your numbers, just explaining why so you would know.

            MSEE, PE

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            • #7
              Thanks. I didn't realize copy and paste wasn't allowed. Thanks for your help. What size inverter would you recommend? I'd rather not spend more on a huge inverter if I don't need to.

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              • #8
                I tried to say: It is confusing that everyone is giving me wrong numbers! I really appreciate your advice!

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                • #9
                  The appliance you're trying to run is DC, check into wiring a directly like you suggested.

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