Multiplus tripping mains in charger only mode

Is it tripping the outlet on over current or earth fault (gfci). USA or elsewhere in the world.

If it is over current, then you can set a limit on the current it will draw to stop it tripping breakers. You will need a means to program the Multiplus.

It it is gfci and you are in the USA this is a known issue as the USA uses gfci with very low fault tolerance. If this is the case search tje forum for gfci multiplus. Example below.