Make conky transparent

 Following lines in /home/user/.config/conky are not sufficient to make the conky window transparent:

own_window_type = 'desktop',
    own_window_transparent = true,
    own_window_class = 'override',
        own_window_transparent = true,

These two lines are also necessary:

own_window_argb_visual = false,
    own_window_argb_value = 0,

Screen tear in openbox because of composite manager

 An recurring annoyance in Openbox is screen tear. It is especially likely to occur when using xcompmgr or another composite manager. The solution is to disable xcompmgr in /home/user/.config/openbox 

Or better still create a bash script and connect this to a hotkey as described here