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I have a cheap grid tie inverter which is supposed be activated and deactivated with a rocker switch. The switch is not directly disconnecting the AC power, but acting somewhere deeper inside the circuit. I would like to flip that switch based on the decision of a digital controller and thus activate or deactivate the inverter without flipping the switch by hand.

In order to not loose the device warranty, I can't open it and replace the switch with a relay (which would be my preferred option otherwise). Is there an elegant way, preferably something commercially available, to reliably flip a rocker switch by an actuator.

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  • \$\begingroup\$ You can use a stepper motor, or a motor with a cam or a pair of solenoides (possibly one if you can find a good way to connect it to your switch). But this seems to be very much a product recomendation request, which is off topic for this site. \$\endgroup\$
    – Puffafish
    Commented Oct 13, 2022 at 10:31
  • \$\begingroup\$ A solenoid or possibly two, one of each direction? \$\endgroup\$
    – winny
    Commented Oct 13, 2022 at 10:40
  • \$\begingroup\$ Welcome. Do you have a photo of the switch you want to activate? \$\endgroup\$
    – jonathanjo
    Commented Oct 13, 2022 at 11:51

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Your best bet will be a servo:

  • Servos move at a controlled speed with high torque and have end-limits and absolute positioning, albeit sometimes not very accurate

Whereas

  • Solenoids have very sudden motions
  • Stepper motors don't have absolute position

If you seach online for servo controlled light switch you'll find lots of images which should give you a good idea of how to do it.

It is essentially a mechanical problem of how to mount the servo to press the switch effectively: many use 3D-printed mountings. To operate a servo you'll find endless tutorials for Arduino, Pi, and every other device.

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