Find the right
backup power setup
Tell us what you want to keep powered and roughly how long for. We’ll do the calculations and show you the VoltReady option that fits.
What are you preparing for?
Choose the closest match. You only need one.
What do you want to keep running?
Choose as many as you need.
Hours during your backup period.
Not sure? Check the label on your device. Motor and compressor devices need a startup or peak figure before we can confirm a safe match.
How long would you like backup for?
One target for your whole setup. You can fine-tune individual devices under Edit.
Your setup
No email or account needed.
Your result
Please note: Calculator results are estimates based on typical appliance usage. Actual performance may vary depending on appliance surge demand, battery condition, temperature, charging method and usage pattern.
Backup Power Calculator FAQs
What size power station do I need for a fridge?
That depends on the fridge type, running wattage, startup surge, and how long you want it powered. A modern fridge may use relatively modest running power, but runtime requirements make a big difference. This calculator helps estimate both output and battery size more realistically.
What is the difference between W and Wh?
W stands for watts, which measures how much power an appliance needs at a given moment. Wh stands for watt-hours, which measures how much energy is needed over time. In simple terms, watts tell you what a device draws, while watt-hours tell you how long a power station can support it.
Can a portable power station run a kettle?
Some can, but kettles usually need very high output for a short period. That means the power station must have enough inverter output, not just enough battery capacity. If you plan to run high-draw appliances like kettles, microwaves, or heaters, focus closely on the output requirement shown in your results.
How accurate is this backup power calculator?
It is designed as a practical planning tool rather than a lab-grade measurement. It uses typical usage assumptions and adds a sensible buffer to help you choose a setup that feels more reliable in real-world use. For unusual appliances or more demanding setups, it is always worth checking the product label or speaking with us directly.
What if I want longer runtime or solar charging?
If you want more flexibility, longer outage coverage, or partial off-grid use, you may be better suited to a larger-capacity model or a solar-compatible setup. The calculator gives you a strong starting point, and from there you can compare upgraded options based on runtime, charging speed, and expandability.