The integrated system dream

I have a dream of a self-sufficient, sustainable boat. It feels like an insane pipedream some days; others, I can almost see how all the bits would work.
Ideally, the boat would have a series of battery banks and and intelligent charging system that would charge first one bank, then the next in rotation. When all battery banks were fully charged, it would run overcharge appliances, such as fridge freezer, etc.
But the power input would also be from multiple sources, such as running the engine, solar, wind, mechanical, heat, even the composting toilet gases if possible.
It would be a mini grid, with all the different sources of energy feeding in, and being controlled by a central computer.
But it wouldn’t just be a self-sufficient electrical system, it would include a watermaker, using rainwater, pee from the separator toilet, and canal/sea water, using osmosis and semipermeable membranes, and obviating the need to fill the water tanks every few weeks. Much like the electrical system, the water system would be source agnostic.
Solids from the composting toilet would ideally be composted and used to grow food, but since space and weight restrictions on a boat make that impractical, they could instead be used to provide fuel for the stove, both for heating and cooking. And gases could be vented or collected for cooking too. I’ve seen a garden waste composter that collects the methane and delivers it to a stove, so maybe that could work.
The stove chimney would be fitted with filters that reduce emissions, and would provide hot water using the backboiler (currently fitted but filled with sand) and possibly recoup some energy as electricity (using piezoelectric thingummies like the fan that distributes heat from it using the heat difference between stove and fan as it’s energy source.
Running the engine now creates heat and electricity, which (theoretically) provides hot water and, with the right wiring, could charge the leisure batteries once the engine batteries were charged. But it would be better to have an electric engine running on solar power, since we’re always more likely to want to do more boating in better weather.
Of course, some of this is reasonably within our grasp, some on the to-do list as time and finances allow. Some, not so much. But who knows, one of these days, we might just live on the eco-boat of our dreams.
The thing is, there have been so many advances in energy generation technology recently, I can taste this dream coming true. I just don’t know enough about the science to apply it to our specific situation and requirements.
So, I’m going to be doing a lot of reading, and asking a lot of dumb questions. You have been warned.

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