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Power Supply Selection Guidelines

2018-10-26 FAQ Document No.1-00000475

Solution:

  • I need help selecting what power supply to use.

    Power Supply Selection Guidelines
    Keep the following requirements in mind when selecting your power supply.
    - Power source, input voltage and Frequency (AC/DC)
    - Number of DC devices to be powered
    - Voltage requirements of DC devices
    - Wattage/Amperage of each DC device required
    - Maximum/Peak draw of each DC device
    - Physical space available and mounting requirements
    - Check for applicable safety approvals for the location and application

    The conversion of Volts to Watts is governed by the equation Watts = Amps x Volts.
    Note: there are 1000 milliamps (mA) in 1 amp.

    While most power supplies allow operation at 100% of rated capacity, it is recommended that an extra 30% be factored in. This allows the power supply to run cooler, more efficient and extends the life.

    For example:
    Device #1 requires 24 Vdc and draws 1 Amp [24Vdc X 1A = 24 Watts]
    Device #2 requires 24 Vdc and draws 500mA [24Vdc x (500/1000)A = 12 Watts]
    Total wattage required is (24 + 12 watts) x 1.3 = 46.8 Watts

    Round up to the nearest 10 watts would be 50 watts.

    Therefore, you would select a power supply rated at 50 watts and outputs 24 volts DC.

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