Medical device battery runtime
Tick your devices, edit the watts to match your label, and enter your battery's rated capacity. Watts shown are typical values for planning, not measurements of your device.
Pre-filled pages
Oxygen concentrator · Oxygen concentrator guide · CPAP with heated humidifier · CPAP guide · Nebulizer guide
How this is worked out
- Energy per day = watts × hours per day, added up over devices.
- A battery delivers about 85% of its rated Wh to the outlets (inverter and battery losses), the same figure as the main calculator.
- The suggested capacity adds a 25% margin and rounds up to the next 50 Wh. Cold rooms, ageing batteries and higher flow settings all use more.
- Stationary oxygen concentrators run around the clock, so even a large station lasts well under a day or two. Portable pulse-dose units also have their own internal batteries; this tool covers running them from the wall or charging them.
Find stations that fit in the backup power calculator. We list no prices and have not hands-on tested any product.