Do your CPAP machines support 110v or 240v voltage?
All machines we sell support 100v - 240v AC auto conversion. You can use these machines anywhere around the world without a problem.
However, you may need a plug converter which can be purchased in most hardware stores for a few bucks.
Are there DC/Battery operated CPAP machines?
Most CPAP/APAP/BiPAP-VPAP machines are designed to operate also in DC 12v/24v, but manufacturers recommend to use the machine without a humidifier for long lasting operation. There are machines that have a specific DC power cord to connect from battery to your machine, and some machine designs, such as Transcend and Z1, use a specific battery.