What size power station do I need for camping?

Most weekend setups land between 600 and 1,200 watt-hours per day once a 12V fridge, a fan, lights, and a laptop are running. That means a 1,000-1,500 Wh LiFePO4 station with 200W of solar will usually stay ahead of the load for two to three nights. A week-long fridge-and-cooking trip with no shore power generally pushes the math to a 2,000-3,000 Wh portable or a dedicated dual-battery LiFePO4 build.

Are marketed watt-hours the same as usable watt-hours?

No. Marketed capacity is gross. LiFePO4 stations realistically deliver 90 to 95 percent of the rated number safely; older NMC-chemistry units should be treated more like 80 percent usable. After that, take another 5-15 percent off for inverter losses when running AC loads. A 1,000 Wh LFP station gives you roughly 800-900 Wh of clean trip energy.

How much power does a 12V camping fridge actually use?

A 60L 12V compressor fridge in 25C (77F) ambient typically draws 40-60W when the compressor is running, with a duty cycle of 30-50 percent depending on insulation, ambient temperature, and how often you open the lid. That works out to about 350-600 watt-hours per day. Hotter weather pushes the duty cycle up; freezer mode roughly doubles the daily draw.

How much solar do I need to keep a power station charged?

In good summer conditions, a 200W folding or roof panel delivers roughly 400-840 Wh per day after real-world losses. That covers a typical 12V camping fridge with margin to spare. In mixed cloud, expect 200-500 Wh per day. For longer trips or shoulder-season camping, oversize the panel to 300-400W or plan a second recharge source (alternator or shore power).

When should I skip a portable power station and build a dual-battery system?

Three signals point to dual-battery: daily draw above 2,000 watt-hours, trip lengths longer than a week with no shore power, and an install that can stay permanently in the vehicle. A dedicated LiFePO4 house battery with a DC-DC charger and a separately sized inverter is 40-60 percent cheaper per usable watt-hour than a comparable portable and accepts much higher alternator recharge rates. The lithium battery guide covers the wiring decisions.

Does cold weather change the sizing math?

Yes, in two ways. First, LiFePO4 chemistry should not be charged below 0C (32F) without a built-in heater, so winter trips need either a station with a heater or a warm storage spot before charging. Second, fridge duty cycles drop in cold weather but laptops, fans, and heated blankets often run more, so the daily watt-hour number can go up rather than down. Add 20-30 percent capacity margin for shoulder-season camping.

What Size Power Station Do You Need for Camping? A Watt-Hour Sizing Guide

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Step 1 - List every load and its hours per day

The single highest-value thing you can do before shopping is to write down what you actually plan to run, what each device pulls in watts, and how many hours per day it runs. This table is the camping-power-sizing version of running a load calc. The numbers below cover the gear vehicle campers run most often.

Common camping appliance loads and daily watt-hour totals
Appliance	Typical wattage	Hours per day	Wh per day
12V compressor fridge, 35L, 25C ambient	30-45W (when running)	Duty 30-50%	200-450 Wh
12V compressor fridge, 60L, 25C ambient	40-60W (when running)	Duty 30-50%	350-600 Wh
MaxxAir / Fantastic fan, low	1-2A @ 12V	6-8 hours	70-130 Wh
MaxxAir / Fantastic fan, high	3-5A @ 12V	4-6 hours	150-300 Wh
USB phone charge	5-10W	2-3 hours each	10-30 Wh per phone
Laptop, full work day	30-60W average	1-2 charges	60-120 Wh
Mirrorless camera battery	12-18W charger	1-2 hours	15-35 Wh per battery
Drone battery (FPV/3S/4S)	60-90W charger	1 hour	60-90 Wh
LED string lights, 5m	5-10W	4-5 hours	20-50 Wh
Electric kettle (1L water)	1,200-1,500W	5-7 min	100-180 Wh per boil
Induction burner	1,200-1,800W	20-40 min	400-1,200 Wh
CPAP machine, no heated humidifier	30-65W	7-8 hours	210-520 Wh

Ranges are conservative middle-of-the-road values, not best-case manufacturer claims. Fridge duty cycle varies with ambient temperature, how often the lid opens, and insulation - measure your own once you have a Kill-A-Watt or a station with a real-time power readout.

Step 2 - Do the math, then add 25 percent margin

Add up your daily watt-hours and multiply by trip length in days. That gives you the total energy budget. Then divide by your usable capacity per cycle (90 percent of gross for LiFePO4, 80 percent for NMC) and apply a 20-30 percent margin for cloudy days, inverter losses, and the cold-weather discount.

Required gross capacity = (daily Wh × trip days) / (usable% × recharge factor)

Worked example A - weekend with a 60L fridge

A couple takes a 3-night weekend in a Subaru Outback with a 60L 12V fridge, a roof fan, two laptops, and string lights:

Fridge: 450 Wh/day × 3 = 1,350 Wh
Fan (medium): 180 Wh/day × 3 = 540 Wh
2 laptops, full charge each day: 180 Wh/day × 3 = 540 Wh
Lights: 30 Wh/day × 3 = 90 Wh
Total trip energy: ~2,520 Wh over 3 days

With one 200W solar panel delivering ~500 Wh per day on a good summer day, the battery only has to cover the gap: roughly 2,520 - 1,500 = 1,020 Wh of stored energy. Divide by 90 percent usable (LFP) and add 25 percent margin: ~1,400 Wh of gross capacity - which lines up with a 1,000-1,500 Wh mid-tier station like the Jackery Explorer 1000 v2, EcoFlow Delta 2, or Bluetti AC180. See the buying guide for picks in that tier.

Worked example B - week-long base camp with induction

Two campers stay at one site for 7 days in a truck-bed setup with the same 60L fridge, a fan, lights, laptops, plus an induction burner for one meal per day:

Fridge: 500 Wh/day × 7 = 3,500 Wh
Fan: 200 Wh/day × 7 = 1,400 Wh
Laptops + cameras: 200 Wh/day × 7 = 1,400 Wh
Lights: 40 Wh/day × 7 = 280 Wh
Induction (30 min/day): 700 Wh/day × 7 = 4,900 Wh
Total trip energy: ~11,500 Wh over 7 days

Even with 400W of solar delivering ~1,500 Wh per day, you still need ~1,000 Wh per day of stored backup energy. Across 7 days that is ~7,000 Wh of stored energy capacity needed, which is well into dual-battery LiFePO4 build territory or a 3,600 Wh portable plus an expansion battery. At this load, a permanent install is almost always cheaper per usable watt-hour - see the lithium battery guide.

Step 3 - Pick a capacity band

With a daily watt-hour target in hand, the band almost picks itself. Use this as the quick sanity check before shopping a specific brand.

Capacity bands by daily watt-hour target
Capacity band	Daily Wh target	Use case	Typical solar input	Typical AC inverter
Small (< 500 Wh)	100-350 Wh	Phones, lights, laptop weekends, no fridge	60-100W	300-700W
Mid (500-1,500 Wh)	350-1,000 Wh	Fridge + fan + laptop, 2-4 nights	200-500W	1,000-1,800W
Large (1,500-3,600 Wh)	1,000-2,500 Wh	Week-long base camp, induction, partial home backup	400-1,600W	1,800-3,600W
Dual-battery LiFePO4 build	> 2,000 Wh sustained	Permanent van/truck install, electric cooking, long trips	400-1,200W + DC-DC	1,500-3,000W (sized to load)

These bands assume LiFePO4 chemistry and at least one recharge source (solar or shore power). NMC stations need ~10 percent more rated capacity to deliver the same usable energy.

How much solar you can actually expect

Solar marketing assumes ideal conditions: perfect angle, no shade, clear sky, room temperature. Real-world delivery is typically 50-70 percent of rated panel wattage over a full day. Use this rule of thumb:

Daily solar Wh ≈ rated panel W × 4.5 sun hours × 0.7 loss factor

100W panel: ~315 Wh per day in good summer conditions, ~150-200 Wh in mixed cloud.
200W panel: ~630 Wh per day in good summer conditions, ~300-450 Wh in mixed cloud.
400W panel: ~1,260 Wh per day in good summer conditions, ~600-900 Wh in mixed cloud.

Two real-world factors shrink that further: panel angle (folding panels lying flat can lose 20-30 percent over a tilted setup) and partial shade (one shaded cell can drop a string panel's output by 50 percent until the shade clears). Plan for a worse day than you think you will have.

Alternator and DC-DC charging

On road-trip itineraries, driving is the most reliable recharge source. The catch is that a stock cigarette socket caps near 100W of input on most portable stations because of the 10A circuit, the connector resistance, and the protective limits the station enforces. A wired DC-DC charger bypasses that limit and can push 300-500W or more into a station with a compatible input.

For drivers covering 100+ km per day, a DC-DC charger consistently outperforms even a 400W solar panel. For drivers who park for days at a time, solar wins. Most long-trip vehicle campers eventually run both.

Cold-weather adjustments

Two things change in shoulder-season and winter camping. First, LiFePO4 chemistry should not be charged below 0C (32F) - the cells suffer permanent damage. Stations with built-in low-temperature charging heaters (some recent EcoFlow and Bluetti models) handle this automatically; older or budget stations do not. The conservative answer is to keep the unit inside the tent or vehicle overnight in cold weather.

Second, fridges run less in cold ambient (good), but laptops, lights, and heated blankets run more (bad). Net effect for most vehicle campers is roughly a wash on total daily Wh, but the capacity buffer goes from 20 percent to 30 percent because of slower solar yield and shorter sun hours.

Common sizing mistakes

Buying for gross capacity instead of usable. A 1,000 Wh LFP station delivers roughly 800-900 Wh of usable trip energy after depth-of-discharge and inverter losses. Buyers who size to gross capacity routinely run out of power on night two of a trip the spec sheet said should easily clear three nights.
Sizing for the average appliance instead of the loudest one. An undersized inverter clips coffee makers, induction burners, and hair dryers even when the battery has plenty of energy left. Match the inverter ceiling to the single loudest appliance you will run.
Ignoring recharge time. A 3,000 Wh station that refills slowly from a wall outlet (3-4 hours) and slowly from solar (200W ceiling) is the wrong answer for a road tripper who relocates daily. The 1,000 Wh mid station that refills in 60 minutes is often better at the same trip pattern.
Not planning a second recharge source. Solar alone fails on the third cloudy day. The cleanest insurance is a DC-DC charger for driving days and shore power compatibility for occasional hookups.
Buying a portable when a permanent install is the right answer. Above 2,000 Wh of daily need or once an install can live in one vehicle, dual battery LiFePO4 is usually cheaper per usable Wh, charges faster from the alternator, and lasts longer.

Best next step

Once you have a watt-hour target, the highest-value next move is to either run the sizing calculator or jump straight to the buying guide if you already know the capacity band.

Capacity band locked in? Compare specific products in the best portable power station buying guide.
Brand-shopping? Read Jackery vs EcoFlow vs Bluetti - the three biggest brands compared at each capacity tier.
Pushing past 2,000 Wh daily? Read the lithium battery for RV, van, and truck camping guide.