60W load frying my relays - Raspberry Pi Forums

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hi


have rpi switching few devices on , off via relay board. has been working happily time powerful device has habit of breaking whichever relay connected to. 12v/5a peltier heat pump supplied 60w power supply (i know isn't ideal, shortly upgrading 120w).

relays rated @ ac250v 10a/dc30v 10a (as seen here: http://www.ebay.co.uk/itm/5v-8-channel- ... 20fd5151b7) should able deal load.

electronics noob i'm bit puzzled why happening, surely spike transformer when powering on shouldn't enough burn out relay?

since have number of 12v devices being operated relays i'm add common 120w 12v supply don't need separate power supply each. peltier cooler utilising , ditch over-worked 60w supply. rpi powered circuit using switching regulator step down 5v. max theoretical load on new circuit ~90w though it's unlikely devices on simultaneously.

i'm hoping since 120w supply permanently on reduce spikes occurring thought post here in case i'm making glaring mistakes.

tips on how debug great.

8-)

in way relays failing ?

petero


raspberrypi



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