Choosing a Portable Power Station: A Plain-English Guide

Portable power stations have become a favorite way to keep phones, lights, CPAP machines and small appliances running during an outage. They are quiet, can be used indoors and need no fuel. Picking one comes down to a few numbers.

Capacity: watt-hours (Wh)

Capacity tells you how much energy the battery holds. Add up what you want to run and for how long. A phone needs roughly 10 to 20 Wh to charge. A CPAP might use 30 to 60 Wh a night. A small refrigerator can use several hundred Wh a day. Plan for about 15 percent less than the rated capacity once conversion losses are counted.

Output: watts (W)

The output rating is the most power the station can deliver at once. Check the running watts of each device you plan to plug in at the same time. Devices with motors, like fridges and pumps, need extra power for a moment when they start, so look at the surge rating too.

Battery chemistry

Many newer models use LiFePO4 (lithium iron phosphate) batteries. They typically last thousands of charge cycles and hold up well over years of storage, which matters for gear that sits waiting for an emergency.

Ways to recharge

• Wall outlet: fastest; top it up before storms.
• Car outlet: slow, but useful on the road.
• Solar panels: the key to running for days without grid power. Match the panel wattage to the station's solar input limit.

Useful extras

Look for enough AC outlets and USB-C ports for your needs, a clear display that shows remaining time, and pass-through charging so it can act as a basic backup while plugged in.

Know the limits

A portable station will not run central air or an electric range. For whole-home needs, talk with an electrician about a properly installed generator or home battery system. For keeping the essentials going, though, a well-sized power station is one of the most practical upgrades a household can make.

Always follow the manufacturer's instructions for charging, storage and use.