HydroDC
Well-Known Member
Use what you like, in any event I think the relay is a good idea. I thought you were asking if anyone has done this. I have and that's the relay I'm using.40A is probably overkill was thinking more along the lines of this
http://au.rs-online.com/web/p/latching-relays/6838766/
12V 2A supply to the fan and 72V 1.05A supply to the cob