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Best relay board for light DC loads?


I am looking for a relay board to use on a small boat. 12VDC currently powers everything onboard through a switch panel. I was perusing the offerings and came across the https://store.ncd.io/product/relay-controller-4-channel-general-purpose-spdt-8-channel-adc-proxr-lite/ but my sense is that the loads for which this board is designed are larger than those on the boat. The largest load that I have is 2 amps 12 VDC and the smallest is 0.5 A 12 VDC. Would there be a better relay board to use in this situation. Also please comment on how much power the board itself will draw. As I am running mostly on batteries I need low power whenever possible.



This should be a good choice for your application.  Current draw depends on communication technology.  USB and RS-232 offer low power consumption, under 100mA standby, and around 70mA for each active relay.  Ethernet and wireless technologies can cost more power, up to 300mA or so for standby operation.  Please let us know if we can help with anything else, and very sorry for the slow response to your questions.




Thanks for the response. So the board I had found is the one you would recommend? I would prefer to use wifi or Ethernet. I'm surprised Ethernet would take more power?


Yes, the controller you chose is very common for general purpose switching applications.  Ethernet is surprisingly high in power consumption when compared to usb and serial versions.  I kno...it does not make a lot of sense, but it is very reliable.