A week without shore connections
Given the boat away from the pontoon (or shore services down), when a full week of normal living runs on tanks and batteries, then water, power, heating and waste all last — or the scenario defines the required capacities.
To answer
- Daily water consumption (measure on land first — telemetry phase).
- Power: battery bank + solar sizing for the measured load; winter vs summer.
- Black/grey water: holding capacity, and where pump-out actually exists on the Tejo.
- Fridge, cooking and hot water energy sources; gas vs electric.
- This scenario generates the spec for the energy/water section of the requirements matrix.