Wiring solenoid and float switch

[Joshbd]

I'm setting up a mixing station that will in part be controlled by a float switch attached to a solenoid or mechanical ball valve. If the solenoid or valve is already 12v DC, do I really need to wire in a relay as well? If so, why? I appreciate the need for a relay if I was turning off something larger like a pump, but the solenoid is only max 5W. Thanks!

 

[Mayhem]

I’d wire it directly too.

 

[bobbravo2]

Depends on the ampacity rating of the float switch. If it can handle an amp or more - you’ll be good to wire directly. If it’s a smaller (reed switch/magnetic) float valve, it might struggle with the current of a larger solenoid valve.