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I'm looking for relay boards that can handle 20V/20A DC easily and can be switched with the raspberry pi. I have been googling for days but haven't found anything ready made for DC, only for AC. I want to turn on a cheap tire inflator (12V and 12Amps) with the pi and the power for the inflator comes from a power adaptor. The relays I have found are mostly found in cars and I'm not experienced enough to come up with my own solution as these types of relays require more than 5V to be switched. Can you help or provide a diagram?

  • Have you considered buying two relays, one controlled by the Pi and another controlled by the first relay? It might be hard to find a 20amp module directly controllable by the Pi. – joan Jan 20 '17 at 16:20
  • I have not considered this. Doesn't this add a lot of complexity to the project? – simplex123 Jan 20 '17 at 16:22
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if you want to high current capacity Relay for control device you can use Solid state relay

refer this link for SSR Solid State Relay

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Use an N-chsnnel MOSFET to switch a 12V (car) relay. A 2N7000 is good for this.

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