What Size Power Station Do I Need? (A Buyer’s Guide)
Buying a portable power station is an investment in independence, whether you’re heading deep into the Australian bush or ensuring your home stays functional during a blackout. However, the most common mistake buyers make is overestimating what a "small" unit can do or overpaying for a "large" unit they can’t easily move.
To choose the right size, you need to look past the marketing and understand two specific metrics: Capacity (Watt-hours) and Output (Watts).
The Essential Math: Watts vs. Watt-Hours
Think of your power station like a water tank.
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Watts (W) is the Flow: How much power the station can "push" out at once. If you plug in a 1500W kettle, your station must have an output of at least 1500W.
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Watt-Hours (Wh) is the Tank Size: How much total energy is stored. This determines how long you can run your gear.
The Calculation Formula
To find your requirement, list every device you plan to use and its wattage (usually found on the power brick or a sticker on the device).
(Device Watts × Hours of Use) ÷ 0.85 (Efficiency Factor) = Your Required Wh
Note: We divide by 0.85 because roughly 15% of energy is lost as heat during the conversion from DC to AC power.
Practical Example: The Weekend Setup
| Device | Watts | Hours Used | Total Wh Needed |
|---|---|---|---|
| 12V Camping Fridge | 60W | 24 (Cycles 25%) | 360Wh |
| LED Camp Lights | 10W | 5 hours | 50Wh |
| Smartphone (x2) | 10W | 2 hours | 20Wh |
| Laptop Charge | 60W | 2 hours | 120Wh |
| TOTAL | 550Wh per day | ||
The Result: If you want to camp for two days without solar panels, you would need a portable power station with at least 1100Wh to 1300Wh of capacity.
Simple Size Guide: Which Category Fits You?
Small (240Wh – 500Wh): The "Weekender"
These units are about the size of a small lunchbox and usually weigh under 5kg.
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Who it’s for: Minimalist campers, photographers, and hikers.
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What it runs: Small drones, cameras, tablets, and phones.
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Limitations: It will not run heating appliances (kettles, heaters) or large fridges for more than a few hours.
Medium (500Wh – 1,500Wh): The "All-Rounder"
This is the "sweet spot" for most Australian buyers. It’s portable enough to lift with one hand but powerful enough to be useful.
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Who it’s for: Car campers, 4WD enthusiasts, and remote workers.
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What it runs: 12V fridges (consistently), Starlink kits, CPAP machines (2-3 nights), and blenders.
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Highlight: Most units in this range, like the EcoFlow Delta 3 Plus Portable Power Station, can handle "Pass-through charging," meaning you can charge it via solar during the day while it keeps your fridge running.
Large (2,000Wh – 3,600Wh+): The "Home Backup"
These units often feature wheels and telescopic handles because they are heavy (25kg - 45kg).
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Who it’s for: Off-grid cabins, caravans, and emergency home backup.
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What it runs: High-draw appliances like coffee machines, air fryers, microwave ovens, and power tools.
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Highlight: These units can often be expanded with extra batteries to reach 10kWh or more.
Real-World Use Cases
The Remote Professional (WFH Anywhere)
If you are working from a van or a remote campsite, your biggest power hogs are your laptop and your internet connection.
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Starlink: Consumes ~50W–75W.
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Laptop: Consumes ~60W while charging.
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Recommendation: A 1000Wh station provides roughly 10–12 hours of "office time", including some overhead for lights and phone charging.
The Home Emergency Setup
During an Australian summer storm, the main priority is keeping the food fresh and the house cool.
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Full-sized Fridge: Modern fridges are efficient but need a station with a high surge rating to start the compressor.
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Pedestal Fan: Uses about 40W.
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Recommendation: A 2000Wh station, such as iTechWorld PS3600, can keep a modern fridge running for 15–20 hours, giving you plenty of time for the grid to come back online.
Mistakes to Avoid When Choosing
1. Ignoring "Inverter Size" (The "Watts" Limit)
You might buy a 1000Wh battery (large capacity), but if it only has a 500W inverter, it cannot run a 1000W toaster. Always check the "Continuous AC Output" rating. If you want to use a kettle or hair dryer, you generally need an output of 2000W or higher.
2. Not Checking the Battery Chemistry (LFP vs. Li-ion)
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LiFePO4 (LFP): These batteries can be charged and discharged 3,000+ times before losing significant capacity. This is about 10 years of use.
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NMC (Lithium-ion): These are lighter but usually only last for 500–800 cycles (about 2-3 years of heavy use).
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Buyer Tip: If you use your station weekly, always choose LFP, found in high-cycle units like EcoFlow DELTA Pro 3
3. Underestimating Recharging Speed
A large 2000Wh battery is useless if it takes 24 hours to charge from a wall outlet. Look for units that support Fast AC Charging (0–80% in under 1.5 hours) and have a high Solar Input (at least 200W–400W) so you can top it up quickly while off-grid.
Summary: How to Decide?
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List your "Must-Haves": What can't you live without? (Fridge, CPAP, Phone).
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Check the Wattage: Ensure the station’s output exceeds your most powerful device.
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Check the Capacity: Use the formula above to ensure it lasts as long as you need.
If you are still unsure, we recommend starting with a 1000Wh unit—it provides the best balance of portability and power for the average Australian user. Browse our curated selection of portable power stations to find a model that fits your lifestyle.