Camp Power Lab
Stop guessing at watts.
Plan the battery, runtime, solar input, and electrical match before the campsite is dark and the fridge is warming up.
One setup, five questions
Start with the failure you cannot afford
A weekend phone charger and an overnight medical device should not be sized with the same shortcut. Pick the scenario, enter numbers from your equipment labels, and see both the minimum and the comfortable target.
Camp Power Workbench
Start with what needs to stay on
Comfortable target
1.4 kWh
Large / 1.2–2kWh with breathing room for weather, conversion loss, and battery reserve.
434 Wh
daily draw
1.1 kWh
minimum capacity
100W
minimum AC output
3
loads planned
Capacity stores energy. Output watts decide whether a high-draw appliance can start at all.
Read the electrical map
Three numbers. Three different jobs.
Most bad recommendations collapse capacity, output, and solar input into one vague idea of “power.” Keeping them separate prevents an expensive mismatch.
Capacity
How much energy the battery can store over time.
Output
What the inverter can run at one moment.
Solar input
What the charging controller can safely accept.
Related camp-power guides
Use the number, then solve the setup
Sizing
What size power station do you need?
Turn the workbench result into a practical capacity and output decision.
Open guideTroubleshooting
Why solar charging stops
Diagnose shade, voltage, adapters, limits, and input settings in order.
Open guideBuying guide
Compare portable power stations
Move from the capacity band to specific stations and verified purchase paths.
Open guideBuying guide
Compare portable solar panels
Find the right output, connector, portability, and weather protection.
Open guideWhy the answer has a range
Camping is not a laboratory
The workbench leaves room for conversion loss, battery reserve, cycling loads, and imperfect sun. It does not assume a solar panel will hold its rated output all afternoon or that a fridge will run the same way in April and August.
Use the draw printed on your exact device whenever it is available. For critical equipment, test the full setup at home under the settings you will use outside.
Battery reserve
Keeps the estimate from depending on a full discharge in the field.
Conversion loss
Accounts for energy lost between the battery and the device you plug in.
Weather and temperature
Adjusts for cloud cover, panel angle, heat, and cold-weather voltage changes.
Straight answers
Camp power FAQ
What is the difference between watts and watt-hours?+
Watts describe how much power a device demands at one moment. Watt-hours describe how much energy a battery stores or a device uses over time. You need enough output watts to start the device and enough watt-hours to keep it running.
How much battery reserve should I keep while camping?+
Plan around 15 to 25 percent reserve instead of running to zero. Cold temperatures, conversion losses, battery age, and unexpectedly long compressor cycles can all shrink the runtime you calculated at home.
Why does a solar panel rarely produce its rated wattage?+
Panel ratings come from controlled test conditions. Heat, angle, haze, cable loss, partial shade, and the power station's input controller reduce real output. A clear-day estimate around 65 to 80 percent of rated output is more useful for trip planning.
Can any portable solar panel charge any power station?+
Not automatically. The panel array's open-circuit voltage must remain below the station's maximum input voltage, including a cold-weather margin. Current, connector, polarity, minimum MPPT voltage, and the station's allowed solar wattage also need to match.
Can I rely on the CPAP estimate for a trip?+
Treat it as a planning estimate only. Use your machine's measured average draw, test the exact station and adapter through a full night at home, preserve a generous reserve, and follow the equipment manufacturers' instructions.