The Secret to Never Running Out of Juice Again

Before you can calculate the device runtime, you need to gather some key information.
The Secret to Never Running Out of Juice Again - Mud Tracks

Portable power stations have revolutionised the way we stay connected and power our devices on the go.

Whether you're living off the grid, camping, working remotely, or facing a power outage, understanding how long your portable power station can run devices is crucial. Amp-hours (Ah) play a pivotal role in this calculation. We'll delve into the concept of amp-hours, explain how they relate to device runtime, and provide step-by-step guidance on how to accurately determine the runtime of various devices using amp-hours.

Understanding Amp-Hours

Amp-hour (Ah) is a unit of measurement that represents the amount of charge a battery can hold and deliver over time. It's a fundamental metric for evaluating the capacity of a battery or power storage system. For instance, a battery with a capacity of 100Ah can theoretically provide a continuous current of 1 amp for 100 hours, or 10 amps for 10 hours.

Gather Necessary Information

Before you can calculate the device runtime, you need to gather some key information:

  1. Device Power Consumption (Wattage): Determine the power consumption of the device you intend to power. This information is usually provided on the device itself or in its user manual and is measured in watts (W).

  2. Portable Power Station Capacity (Ah): Find the amp-hour rating of your portable power station. This information is typically provided by the manufacturer and represents the total charge the battery can hold.

  3. Inverter Efficiency: Many portable power stations use inverters to convert the stored DC power into AC power, which most of our devices use. Inverters have an efficiency rating that affects the amount of energy available for your devices.

Calculate Device Runtime

To determine how long your portable power station can run a specific device, you'll follow this formula:

Runtime (hours) = Battery Capacity (Ah) × Inverter Efficiency / Device Power Consumption (W)

Example Calculations

Let's consider an example to illustrate the calculation process:

  1. Device: Laptop
  2. Device Power Consumption: 50W
  3. Portable Power Station Capacity: 200Ah
  4. Inverter Efficiency: 90% (0.9)

Runtime (hours) = 200Ah × 0.9 / 50W = 3.6 hours

This means that, under the given conditions, your laptop can run for approximately 3.6 hours on a portable power station with a capacity of 200Ah.

Accounting for Multiple Devices

If you intend to power multiple devices simultaneously, sum up the power consumption of all devices to calculate the combined runtime. For instance, if you're using the above power station to power both a laptop (50W) and a smartphone charger (10W), the total power consumption would be 60W. Use this value in the formula to determine the combined runtime.


Understanding amp-hours and how they relate to device runtime is essential for making informed decisions when using portable power stations. By following the simple steps outlined in this article, you can accurately calculate how long your devices will run on a given portable power station. This knowledge empowers you to plan your activities, trips, and emergency situations with confidence, ensuring you have the power you need when you need it.

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