Portable Power Station Runtime Calculator

Fine Print and Sources

Screening estimate only. These tools use only the values you enter and simple planning math. A licensed electrician or battery installer is authoritative for final capacity, backup panel design, and installation. Confirm the numbers with a professional and get written quotes.

Runtime hours equal watt-hours multiplied by inverter efficiency, divided by the device wattage. High-surge devices such as motors, compressors, and pumps may not start even when the station lists enough continuous watts, because startup surge exceeds the running draw.

• US Department of Energy, battery backup for your home: explains that home battery sizing depends on the loads you want to back up and how long you want to run them.