I get overwhelmed looking at options for things like relays. Are standard automotive relays (with the 12v could and 12V 30amp rating on the triggered circuit) ok to use? They're really cheap on Amazon, and some have built in fuse holders that I could put a10 amp fuse in for each of my districts (like these: https://www.amazon.com/ask/que..._hza?isAnswered=true
But I don't know if I need a relay that is rated for AC (20V). I only need 10 amp rating, but there's so many 12VDCv relays rated for 40 amps I gotta think that excess capacity is Ok for my 20Vac 10 amps. Or is it?