3. Connect the 24V DC converter to the battery output port and then turn on battery4. Connect battery to CPAP machine power input port.
Battery Running Time: Depending on CPAP Machine setting and running environment, a CPAP machine may need as much as 90W power or as little as 10W power. So the battery running time may vary a lot: from 2 hours to 20 hours. To maximum battery running time, please turn off CPAP Machine humidifier and heater, set the pressure as low as possible.