JournalPortable Power for Overlanding: Batteries, Solar and Charging
In short: Work out your daily power use in watt-hours, then choose a battery and charging method to match: a portable power station, a vehicle-based battery, solar panels or a mix. Fuse and wire everything properly, and keep batteries cool and secured.
Quick facts
| Formula | Watt-hours = watts x hours of use |
|---|---|
| Example | A 30 W load running for 24 hours uses 720 Wh (illustrative) |
| Safety | Fuse close to the battery and use correctly rated cables |
Step 1: add up your daily use
| Device | Typical use (illustrative) | Check on the label |
|---|---|---|
| Phones and cameras | Short charging each day | Watts or amps and volts |
| Lighting | A few hours each night | Watts per lamp |
| Compressor fridge | Cycles on and off all day | Average consumption, not just peak |
| Laptop or drone | Occasional charging | Charger watts |
Step 2: choose a power source
- Portable power station: simple, quiet, easy to remove from the vehicle.
- Second battery in the vehicle with a proper charging system: higher capacity, needs correct installation.
- Solar panel: tops up the battery during the day; output varies with sun and shade.
- Vehicle charging while driving: effective but depends on the alternator and wiring.
Step 3: install and use safely
- Fit a fuse close to the battery and use cables rated for the current.
- Secure batteries so they cannot shift or short; keep them out of direct heat.
- Do not drain a starting battery that you need to start the engine.
- Electrical modifications may need disclosure to insurers or approval; check first.
Related guides
Powering navigation is covered in GPS and offline maps. See building your first overlanding vehicle and the family camping checklist for how power fits your kit.
Frequently asked questions
How do I know how big a battery I need?
Add up daily watt-hours for your devices and add a margin of around 20 to 30 per cent.
Is solar enough on its own?
It depends on panel size, sun and your load; many setups combine solar with driving charge.
Can I wire it myself?
Only with the right skills and parts; incorrect wiring is a fire risk.
Will modifications affect my insurance?
They can. Tell your insurer and follow local rules.
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