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Can you call the stores like Carefour or El Corte Inglés if it works, and if not or no idea, if they have 380v (red) at the back. I have seen the 3 fase 32/16 amp connections in Barcelona at El Corte Inglés at the back (no, nothing weird me being at the back outside of the store, tried to take a short cut )
Also, Puerto de Tarragona is close by. Maybe they have chargers for boats like the blue and/or red connectors for your UMC