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I have identified the following power requirements, and have assumed 24 hour always on to provide an extra buffer to take into account such extreme eventualities, ensuring that it’s always possible to work no matter what.

power tools

This might be an area requiring an alternator

Household Requirements

  • Fridge / freezer

  • Interior lights (can be converted to LED at some cost & trouble)

  • Water heater

  • Microwave (if fitted)

  • Air conditioning (AC power only)

  • Heater (non-electric solutions available, e.g. propane)

  • Sufficient spare amperage for battery bank charging

  • Bilge / emergency pumps & switches

  • Water pump (for sink, shower)

  • Electric macerator pump (if fitted, and you should)

Legal requirements

  • Navigation / anchor lights

  • Marine radio (VHF)

  • AIS receiver

Sailing / Cruising / Navigation Requirements

  • Windlass (AC power only; 80A)

  • Chartplotter + instrumentation

  • Radar (if fitted)

  • Electric autopilot (if fitted)

  • Watermaker (if fitted)

  • Marine radio (HF)

  • AIS transceiver

Without going into too much detail, the problem of electrifying a boat is a solved issue, in that sense I refer the reader to such experts [1], [2], [3] who estimate the maximum power draw whilst at sea (which is when the most power is used) over a 24 hour period to be about 3000 Watt hours. In contrast, when at anchor (The situation I anticipate being in on a daily basis during the work week) this reduces by around 2/3rds to 1100 Watt hours. These figures include very power hungry items such as an electric autopilot, which I intend not to use (in this case I’d prefer a wind-vane).

This figure takes into account all electronics except those required for work, which I do below.

Office Requirements

  • workstation

  • monitors

  • compute/networking

    • satellite

    • 5g

    • 4g

    • WiFi

    • server

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