Start with watt-hours
Multiply watts by hours for each load. A router at 14W for eight hours is a very different job than a fridge cycling through the night.
Outage backup planner
Size a power station around the loads you actually care about.
Pick the essentials, adjust the assumptions, and get a rough watt-hour target before shopping for a budget power station.
Suggested class 500Wh class
A small overnight setup for phones, router, and lights.
Sizing notes
How to use the outage backup estimate
The planner converts each device into watt-hours, then adds a practical buffer because batteries, inverters, and real loads rarely behave like a perfect spec sheet.
Check running and surge watts
Continuous watt rating matters for steady loads. Surge rating matters for motors, compressors, pumps, and anything that spikes when it starts.
Match battery size to charging plan
A larger battery is only useful during a long outage if you have a realistic wall, car, generator, or solar recharge path.
Next checks
Read before you choose a model
Portable power station sizing
Translate watt-hours into a realistic shopping range.
Read guide300Wh vs 500Wh vs 1000Wh
See how the common size classes fit different backup jobs.
Read guidePower station runtime calculator
Check how long one device can run from a common battery size.
Open calculator