I called and got a tech at ResMed to clarify. The S8 blower units will work on a modified sine wave inverter, but the H3i humidifier can not (must be pure sine wave). BUT, it is ok to leave the units connected running on modified sine wave AC, as long as the humidifier unit is turned OFF. The off po...

I wouldn't risk it unless you can somehow hook the humidifier up to the air path without having it electrically connected. It looks to me like the S8 humidifier plugs into the electrical power when you hook it up to the blower unit. I appreciate the quick response. The H3i humidifier does connect t...