How to design a switch based on current

Discussion in 'The Projects Forum' started by MarkusL, Feb 27, 2012.

  1. MarkusL

    Thread Starter New Member

    Feb 27, 2012
    Hello all,

    this is my first post in the forum :)
    I am running into some problems in a solar power related project.
    I would like to switch between different types of 24VDC to 120VAC inverts depending on the DC current.
    I mean I want to use the smaller inverter below lets say 10A and the bigger above that.

    how can I design a circuit to do that?

  2. #12


    Nov 30, 2010
    This would work a lot better with more information. The trick is to find a measuring point that won't interfere with proper operation and I can't seem to imagine where that is without seeing some kind of schematic drawing.

    Got a pencil and a scanner?
    How about you make a drawing in paint.exe and save it as a .PNG?
  3. MarkusL

    Thread Starter New Member

    Feb 27, 2012
    I have created a sketch - sorry, it's only hand-drawn.
    there are 2 inverters (200W and 1000W) which i want to use depending on the load.
    The reason is that the big inverter has a low efficiency on small loads.
    the switch can be a 120V/10A relay.