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I have two motors, one motor uses 12 V 5 amps and another motor needs 12 V 7 amps, I have a power supply (SMPS) of 12 V 30 amp capacity. I'm planning to connect both motors to the same power supply. Will the motors be affected? When the 7 amp motor is consuming all 7 amps, will it affect the 5 amp motor?

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    \$\begingroup\$ "one motor uses 12 V 5 amps and another motor needs 12 V 7 amps" Is that the motor's specified current draw, or is that what you've guaranteed with your circuitry or mechanical design? If a motor is advertised as "5A" that usually means that it will work forever if you design the mechanical load so the motor draws no more than 5A. If you stall a "5A" motor it may draw many times more current than that. A motor can stand that for short periods of time, but not for extended duration. \$\endgroup\$
    – TimWescott
    Commented Apr 13, 2022 at 20:18
  • \$\begingroup\$ You should look into the datasheets of the motors for the start current when a not rotating motor is connected to 12V. \$\endgroup\$
    – Uwe
    Commented Apr 13, 2022 at 20:43

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Most likely, this will work fine. Connect all three devices in parallel. The power supply will keep the voltage at 12 volts no matter how many amps are drawn - as long as it's not overloaded - which it won't be.

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If these are brushed DC motors that are simply connected to the power supply with a switch, there is a good possibility that just the smaller motor alone will cause the power supply to shut off because of the inrush current.

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