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Overland Electrical System Beginner Guide

A good overland power system is not magic. It is a battery, charging sources, protected wiring, distribution, and realistic energy planning.

Watts, watt-hours, and amp-hours

Watts measure power. Watt-hours measure energy. Amp-hours describe battery capacity, but you need voltage to convert amp-hours into watt-hours.

Watts = volts x amps
Watt-hours = watts x hours
Amp-hours x voltage = watt-hours

Batteries

LiFePO4 is the modern favorite for many truck camping systems. AGM still works, but lithium gives more usable capacity and lower weight for most new builds.

Solar

Solar replaces energy removed from the battery. Panel size, sun hours, shade, clouds, dust, and angle all affect daily harvest.

Inverters

Use 12V gear when possible. Inverters are useful for AC loads, but they add inefficiency and can pull large DC current from the battery.

Fuses and wire size

Fuses protect wire. Wire size depends on current and distance. Long 12V runs need thicker cable to control voltage drop.

Alternator charging

A DC-DC charger is the clean way to charge a house battery from the vehicle while driving, especially with lithium batteries.

Build order

  1. List loads.
  2. Estimate daily watt-hours.
  3. Choose battery capacity.
  4. Add charging sources.
  5. Size wire and fuses.
  6. Test at home before the trail.