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I have a car radiator fan which when measured with a multimeter on a 12v car battery draws 4.7a. I've been trying to run it off an old PC SMPS which is rated at 450W with max amperage of 18a at 12v. The smps doesn't start when i connect the fan to the power supply while the smps fan starts running when there is no load. What would be the problem? Can adding a capacitor make the radiator fan start working - if yes, what values should the capacitors be? What is the right solution to get it working?

Thanks in advance for the answers. Please help.

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DC motors take high currents to start. you'll need some sort of soft-start to get that fan going on that power supply.

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  • \$\begingroup\$ Can you explain a bit more. How do i apply a soft start here? \$\endgroup\$
    – Annu
    Jun 27 '20 at 7:45
  • \$\begingroup\$ it connects between the power supply and the motor and prevents the motor from over-loading the power-supply. \$\endgroup\$
    – Jasen
    Jul 6 '20 at 0:58
  • \$\begingroup\$ Please explain components what are they like. I couldn't find much information online for DC motors \$\endgroup\$
    – Annu
    Jul 6 '20 at 7:22
  • \$\begingroup\$ I searched "DC motor soft start" and found several for sale. \$\endgroup\$
    – Jasen
    Jul 6 '20 at 11:36

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