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So straight to the problem

I need to connect My RPi's GPIO to a (or some) relay(s) that consume around 30 - 60 Amps to fire up and RPi GPIO only give around 16 mA/Pin(Accroding to this).

My question is,what is the safest and best way to connect the GPIO to a relay with 60A of input ?

Thankyou

P.S. : I dont know (almost) anything about electricity and english is not my native language.So i'm sorry if there are any mistakes around here

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Tommy Aria Pradana
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    You must be mistaken. A relays control circuit taking 30 Amps sound terribly wrong. – Ghanima Sep 18 '14 at 06:30
  • 30 Amps consumption for a relay? Please review that. – Kangkan Sep 18 '14 at 07:24
  • Yeah i kinda choked on my tea when i read this, check your power consumption, because anything higher than even .5ma pull i use and external plugpack. – Pariah Sep 19 '14 at 02:45
  • Reviewed,and @Pariah sorry for your tea – Tommy Aria Pradana Sep 19 '14 at 04:18
  • By any chance what is the application for? Because there is no way a raspberry pi will ever output more than 15-50mA on any one pin at any given time, in saying that look up a digitally controlled relay, H-bridge or a irf640-Irfz44 (mosfet) for controlling a switch of any sort. – Pariah Sep 19 '14 at 04:24
  • @Pariah actually i'm trying to controlling relay on a Motorcycle electric starter system.What i know (from my friend who know electronics better than me ) that relay will need at least 30A to fired up and i think it is not a digital controlled relay and i'm trying to control it digitally from Pi – Tommy Aria Pradana Sep 19 '14 at 12:32
  • Ah that makes better sense now, nah id look at a way of isolating a digital control signal from the raspberry pi to actually control the relay circuit, for example look for a relay or switch (like the mentioned mosfets above) because all the mosftet needs is a digital signal to connect the ground and boom you have a viable circuit, but look for high power mosfets that can support 30A+ inputs, because most mosfets only need a small digital signal to complete the connection but thats something id look into if i were you. – Pariah Sep 20 '14 at 15:03

1 Answers1

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Add a transistor to your rpi and the relay to the transistor. This should work.

In case you don't know as much as me - watch this: https://www.youtube.com/watch?v=-td7YT-Pums then you do.

If you could supply some numbers of the parts you are using, we can throw together a drawing for you. But right now it would just be a search in the dark.

Magic-Mouse
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