12vdc 20 Amp relay for Arduino

arduino

#1

I’m after a relay that can power a 12vdc, 20Amp pump.
I would like to control using Arduino 5v logic


#2

I’m afraid all our Arduino relay shields are either max out at 5A or 7A

However this relay control unit kit will go up to 20A.
https://littlebirdelectronics.com.au/products/sparkfun-beefcake-relay-control-kit


#3

Is there a reason not to use a Power Mosfet? eg

https://littlebirdelectronics.com.au/products/n-channel-mosfet-60v-30a


#4

For that power and amperage I would look towards one of the 3D Printer Mosfet Heaterbed Units

http://www.ebay.com.au/itm/Useful-3D-Printer-Heated-Bed-Power-Module-210A-MOSFET-upgrade-RAMPS-1-4-60-50mm-/162501447112?epid=19002919254&hash=item25d5d74dc8:g:rtEAAOSw42dZCZ5o

Alternatively you can use this from Jaycar

https://www.jaycar.com.au/solid-state-relay-4-32vdc-input-30vdc-100a-switching/p/SY4086