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A response from Richard Blanchard who sent me this email to your question:
To my mind a correctly designed and installed micro grid, that follows the Standards for control and protection should not have any challenges. However in my experience this is not always the case. Installers may forget something eg earthing. There could be issues of non standard components too. Getting trained installers and having systems approved by a competent authority is the main challenge.
Kind regards Harriette (RedR)