Thanks for getting back to me. I finally called Zamp and was told that for a Cpap machine, I needed at least a 200W system, an inverter which they have specifically for Cpaps to hardwire to plug closest to where it is needed and to upgrade the battery, preferably adding 2 6volts. After all is said and done we are talking about $2000 plus which is way more than we wanted to spend. Looks like it is shore power or snore power.