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Can I only use one 12V DC power supply for two solenoid valves? I got connect the solenoid valves with a 5V 4 channel relay module with arduino as my microcontroller. Each of the solenoid valve is 12V, 2A. The power supply i using is 12V 2A, and i also got connect each valve with 1N4001 Rectifier Diode.

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  • \$\begingroup\$ yes you can, if the power supply is able to source the required current \$\endgroup\$ – jsotola Apr 21 at 16:58
  • \$\begingroup\$ The power supply i using is 12V 2A, and i also got connect each valve with 1N4001 Rectifier Diode, is it enough to support the two solenoid valves? \$\endgroup\$ – Anohana Apr 21 at 17:55
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    \$\begingroup\$ "Both the solenoid valve is 12V, 2A." Does that mean each valve is rated at 2A or both of them together? \$\endgroup\$ – Unimportant Apr 21 at 18:02
  • \$\begingroup\$ Each of them are rated as 12V, 2A. Not add together. \$\endgroup\$ – Anohana Apr 21 at 18:25
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  • Each solenoid requires 2 A.
  • Your power supply is rated for 2 A.
  • You can power one solenoid valve at a time.
  • You would need a 4 A supply to power both of your solenoids.
  • The diodes won't make an extra 2 A appear out of nowhere.

schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Snubber diodes. You can still only power one 2 A solenoid from a 2 A supply.

The diodes should be connected as shown. Normally they don't conduct but when the relay contacts open they provide a decay path for the current and protect the relay contacts from arcing damage.

schematic

simulate this circuit

Figure 2. As suggested by @SpehroPefhany, this arrangement ensures that only one solenoid can be energised at a time with SV1 getting precedence.

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    \$\begingroup\$ +1 OP could interlock one channel through the N.C. contact to prevent both being powered at once. \$\endgroup\$ – Spehro Pefhany Apr 21 at 18:38
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    \$\begingroup\$ Good idea. Done. \$\endgroup\$ – Transistor Apr 21 at 18:50
  • \$\begingroup\$ Do you mean power supply should be 12V 4A? \$\endgroup\$ – Anohana Apr 22 at 7:10
  • \$\begingroup\$ @Anohana, what part of my answer did you not understand? \$\endgroup\$ – Transistor Apr 22 at 8:33
  • \$\begingroup\$ @Transistor, i understand that based on your answer, only one solenoid valve can be powered on at a time. Since i need both the solenoid valves to be powered at the same time, is it the power supply that i used should be 12V and 4A? Based on these two sentences: You can power one solenoid valve at a time. You would need a 4 A supply to power both of your solenoids. \$\endgroup\$ – Anohana Apr 22 at 11:09

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