14kW is a lot. On our boat we can live off-grid with 860W of solar and a hydrogenerator for when we're under way. Last time we were connected to shore power was in December when we were in the Canaries...
Admittedly in the time since Canaries we've also burned some 10-15l of diesel for propulsion purposes. And we cook with an alcohol stove, not electric. But we do desalinate all our water with the solar we have.
Approximately 3-4 kW per capita is required to approximate medium European lifestyle. A bit could be optimized, but not all that much.
Anything less and you're making important tradeoffs. Either on heating/cooling, transportation, or hardware capabilities.
Usually making tradeoffs hurts the most disadvantaged and poor.
Remember to also count stuff. Embodied energy is a thing so often forgotten. Trash and other waste disposal is not free either. Growing food requires energy input too.
Here's a short summary of our energy setup (and other notes on the Atlantic crossing) https://lille-oe.de/2025-01-24/
Admittedly in the time since Canaries we've also burned some 10-15l of diesel for propulsion purposes. And we cook with an alcohol stove, not electric. But we do desalinate all our water with the solar we have.