Portable power field capacity

This Portable Power Station Size Calculator is a simple yet powerful tool that helps you determine the ideal power station capacity for your needs. By inputting your devices' total power consumption, desired runtime, and power station efficiency, you'll get an accurate estimate of the required capacity in Watt-Hours (Wh).

Most have efficiencies between 0.8 (80%) and 0.9 (90%). If you're unsure, input 0.85 (85%) as a standard value. The tool will compute the required capacity (in Watt-Hours) for the portable power station. The result will tell you the minimum capacity (in Wh) needed for your specific setup and runtime.

Example 2: “You need a power station with at least 1466.67 Wh capacity. Determine the appropriate size of a power station to run lights, fans, and small appliances overnight during camping trips. Ensure you have a power station capable of running essential devices, like CPAP machines or communication devices, during extended outages.

Updated June 2025: We've added a Bluetti model, honorable mentions from EcoFlow and Acer, and a testing and FAQ section. Portable power stations can be very expensive, but discounts, sales, and deals are common. If you can afford to wait, you can likely get your chosen power station for less than the listed MSRP.

All portable power stations can charge up small gadgets like phones and laptops or be used to power lighting. Most can handle small appliances like mini-fridges or TVs. If you want to use power tools, an AC unit, or in the UK, a kettle, you need to be able to draw thousands of watts.

The calculator uses the following formula to determine the required power station size: Required Capacity (Wh)=Device Power (W)×Runtime (hours)EfficiencyRequired Capacity (Wh)=EfficiencyDevice Power (W)×Runtime (hours) Where: Device Power (W): The total power consumption of all devices in watts.