Camping loads are smaller than people plan for
The instinct is to size for the worst case. The reality is that camping electrical demand is dominated by very small things.
| Item | Energy per day |
|---|
| Two phones | About 30 Wh |
|---|
| Headlamps and a lantern | Under 20 Wh |
|---|
| A tablet or a camera | 30-50 Wh |
|---|
| CPAP, no humidifier | 250-350 Wh per night |
|---|
| 12V compressor fridge | 250-600 Wh, depending on ambient temperature |
|---|
| Electric kettle, one boil | About 100 Wh, at 1,500 W |
|---|
Device figures are typical battery capacities and charge counts; CPAP and fridge ranges are the bands used elsewhere on this site. Your fridge figure depends heavily on how hot it is.
Two rows dominate. A CPAP or a fridge turns a 300Wh battery into a one-night proposition; without them, the same battery covers a long weekend easily.
Weight is the specification nobody reads
A 300Wh unit is something you pick up without thinking. A 1,000Wh unit is a deliberate two-handed lift. A 2,000Wh unit does not leave the vehicle.
Which of those is right depends entirely on how far the battery has to travel from the car, and that is a question people answer optimistically at purchase and honestly at the campsite.
The practical rule: buy for the trip you take most often, not the one you imagine. A battery that covers eighty percent of your trips and comes every time beats one that covers everything and stays home.
Cold weather changes the numbers
Lithium cells lose usable capacity in the cold, and more importantly most will refuse to charge below freezing to protect themselves.
For shoulder-season and winter camping that has real consequences: your panel produces power at 20 degF and the battery declines to accept it. The workaround is keeping the unit in the tent or the vehicle overnight and charging during the warmest part of the day.
LiFePO4 tolerates the temperature range better in general, which is one more reason it dominates this category now.
Battery or generator for camping?
For camping specifically, the battery wins more decisively than anywhere else on this site.
A generator at a campsite is loud in a place people chose for quiet, produces exhaust near tents, needs fuel carried in cans, and is banned outright or restricted to daytime windows at many parks. A battery has none of those problems and recharges from the sun.
The exception is an RV air conditioner, which no camping-sized battery will run — the RV generator page covers that case, and the camping and RV scenario page works through owning both.
Four things worth doing before you leave
- Charge it the night before, not the morning of. Most units take several hours from empty.
- Pack the right cables. A charged battery and no USB-C cable is a brick with a screen.
- Test the panel at home if you are bringing one. The connector standard is not universal — the connector guide covers what fits what.
- Know your fridge's real draw. It is the one item that decides whether the battery lasts the trip.
The short version
- 300Wh covers a weekend of devices and lighting for most people.
- A fridge or a CPAP doubles the requirement. Those two items set the size.
- Weight decides whether it comes. Buy for your usual trip.
- Past three days, buy a panel, not a bigger battery.
