A portable power station is a big rechargeable battery with built-in outlets. The spec sheets are full of numbers, but only a few of them decide whether it fits your use. This guide walks through them in the order that matters.
Make a short list of devices and look up their wattage on the label. A phone charger uses roughly 10 to 20 W, a laptop 45 to 100 W, a CPAP machine about 30 to 60 W, a mini fridge 50 to 100 W while running, and a space heater or kettle 1,000 to 1,800 W. Two numbers matter: how much power you need at one moment (watts) and how long you need it (watt-hours).
Capacity in watt-hours tells you how long the unit lasts. Output in watts tells you what it can run at once. A rough runtime is capacity x 0.85 / load in watts, because of conversion losses. A 1,000 Wh unit running a 100 W load lasts about 8 hours. If a device needs more watts than the rated output, the unit will shut down, no matter how big the battery is. Check the surge rating too, because motors and compressors draw extra power at start-up.
Around 300 to 500 Wh is enough for phones, laptops, lights and a weekend of light camping. Around 1,000 to 1,500 Wh covers a mini fridge, a CPAP overnight, or a small RV setup. 2,000 Wh and up is where home backup for a router, fridge and lights starts to make sense. Bigger is heavier: expect about 10 kg for 1,000 Wh and 20 kg or more for 2,000 Wh.
Most current models use either LiFePO4 (LFP) or NMC cells. LFP is heavier but usually rated for around 3,000 charge cycles or more, which means many years of regular use, and it is generally more tolerant of heat. NMC is lighter but is typically rated for fewer cycles. If you will use it often or for home backup, LFP is usually the better long-term choice. If weight is critical, NMC can make sense.
Look at how fast it charges from a wall outlet, whether it accepts 12 V car charging, and how much solar input it supports (maximum watts and voltage range). If you plan to add solar panels, check that the panel voltage fits the unit input range. For home backup, look for pass-through charging and a fast switch-over (often called UPS mode), so connected devices keep running if the power fails.
Pure sine wave AC outlets are safer for sensitive electronics. USB-C Power Delivery at 60 to 100 W charges laptops without an adapter. A 12 V port is useful in a car or RV. Optional extras include expandable battery packs, an app for monitoring, and a built-in light. Make sure the outlet type matches your country.
Check the warranty length (commonly two to five years), the safety certifications, the return policy, and the delivery restrictions for lithium batteries to your country. Confirm the voltage and plug type for your region. Compare the real price per watt-hour rather than the headline discount, because sale prices change often.