Bluetti elite 300 on a boat

Hello, I have a small boat, a Cap Camarat 10.5, I would like to know if is possible to use a Bluetti Elite 300 or 200 like a generator if I stay out one or two nights.
I have two little fridge, Maybe I can use for a nespresso or a microwave but just for some seconds.
I would like to know also how can I link the Bluetti.
I it possible to link the Bluetti directly with service batteries when I travel with the engines on I recharge the Bluetti?
Is it possible to link the entire boat directly, not the single unit, non just the hairdryer or something else?
Thank you.