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Can I connect a 12V solenoid valve directly to a 12V battery?

JRE
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koko htike
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1 Answers1

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Yes, but you might want to connect a reverse biased diode across it to allow the current through the coil a path to flow when the battery is disconnected, else you can generate some very high voltages (and sparks!) on disconnection.

typical circuit:

schematic

simulate this circuit – Schematic created using CircuitLab

Icy
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  • How can I get diode for this diagram? I mean which type of diode. – koko htike Nov 02 '15 at 11:43
  • DC solenoid valve. – koko htike Nov 02 '15 at 11:51
  • It needs a current rating to match the current rating of your solenoid valve, and more than 12V reverse voltage - IN4001 is a typical choice for small solenoids, and is capable of up to 30A peak current. – Icy Nov 02 '15 at 12:00
  • I can't understand clearly.can u explain me more details. – koko htike Nov 02 '15 at 12:08
  • If your solenoid draws 1 Amp when operating, then you need a diode that is rated for 1 Amp current - and an IN4001 would be a good choice. If it draws 100 A, you need a different diode, the relevant parts of the diode data sheet that you should check are the reverse voltage capability (the IN4001 is OK up to 50V), and the current handling - the IN4001 can handle 1A continuously, and up to 30A for a short period (such as when a solenoid is deactivated) – Icy Nov 02 '15 at 12:18
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    Might want a fuse, too. Practically speaking. Batteries can make a right mess of unfused circuits. Put it as near the battery as possible to cover as many errors/problems/defects in wiring as possible. – Ecnerwal Nov 02 '15 at 14:56
  • It would be sensible to check if the solinoid is continiously rated.Some are not so check your application to avoid the possibility of burnout . – Autistic Nov 02 '15 at 19:34