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Using voltmeter/ammeter LED panel as voltmeter only 2018-05-18T04:40:15+00:00

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  • Kris
    May 18, 2018 at 4:40 am
    Post count: 0
    #29771 Reply |

    I have the following 2 of your products, the 50A and 20A volt/ammeter LED panels:
    https://www.amazon.com/dp/B01M9CJYQJ/
    https://www.amazon.com/dp/B01M7R7JPJ/

    While experimenting briefly, I found that I could make either meter work just as a voltmeter by simply connecting to a battery using only the COM(-) and the V(+) connections (using only 2 wires). Is there any harm in doing this? The 50A meter worked this way without using the 50A external shunt.

    Thanks!

    Drok
    Keymaster
    May 21, 2018 at 7:39 am
    Post count: 2971
    #29786 Reply |

    Hello Kris,
    Thanks for writing in.
    If the meter is just used as voltmeter, you can hook it up like that.
    But for measuring current, no matter how large the current is, the 50A meter must be connected wtih shunt, otherwise, the meter will burn out.
    Best regards.

    • This reply was modified 6 years, 6 months ago by  Drok.
    Kris
    May 24, 2018 at 6:37 pm
    Post count: 0
    #29792 Reply |

    OK, thank you.

    Another question regarding the 50 amp meter with shunt:

    https://www.amazon.com/dp/B01M9CJYQJ/

    My RV’s DC current from the RV battery to the 12v fusebox can only be measured from the positive lead. I confirmed this using a clamp ammeter. The negative lead shows 0.0 amps.

    What would happen if I connected the positive lead of the RV battery to the main (amps/current) connections of the shunt instead of the negative, and connected the V+ to the positive lead of the battery as well? If I cannot do this, could I use a separate 12v power source to power the LED panel?

    Thanks again

    Drok
    Keymaster
    May 25, 2018 at 9:37 am
    Post count: 2971
    #29796 Reply |

    Hello Kris,
    This meter has common-ground design that the ground of measuring terminal is interlinked with the ground of power supply.
    So A+ can be only connected between the negative poles of load and power supply. Otherwise the meter will burnt out.
    Best regards.

    Kris
    May 25, 2018 at 3:26 pm
    Post count: 0
    #29797 Reply |

    Thank you.

    So does DROK make any 50amp DC volt/amp meter that allows for a separate power supply to the meter so that I CAN connect to the positive battery lead? If so, can you recommend several to me?

    Drok
    Keymaster
    May 27, 2018 at 9:21 am
    Post count: 2971
    #29799 Reply |

    Hello Kris,

    We don’t have this kind of meter . All of shunts must be connected in the negative side.

    Best regards.

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