The A501 500W power station can furnish strength to CPAP machines in two ways: a 230V AC plug or a 12V DC plug. Its strongly encouraged that you use a DC-DC converter when charging a CPAP machine. Turn off the heater/humidifier to prolong the strength furnish tie of the energy station. In addition, we advocate the DC-DC converter due to the fact the electricity station will ultimate longer than the usage of the AC outlet.