Read up on the power inverter post, and I need some help/clarification. My wife has a CPAC along with an O2 concentrator that will probably not handle the dirty sine waves that come off of my 5500W nominal/6500W peak gas generator. A few years back, I managed to keep the central heater going after the circuit board fried because of the generator, but we survived. Now with this equipment, no way I'd hook it to the gas generator. I have it set up whereas it backfeeds into the house via a 240V/40 Amp connection. This generator also has a DC charge post on the control panel. I have my Interstate 850 CCA boat battery in the garage. If I got an inverter, say around 800W, probably 6-7 Amps, hooked it to the battery, then the battery to the generator and just run extension cords to CPAC and O2 concentrator, would that work?? Could I overcharge that battery? I'm pretty sure there is no type of DC output protection, it has a meter that just shows how much DC output power it's sending to the poles on the panel. I know another option is to just buy a 1000W generator, but geesh, I already got this stuff and would like to somehow make it work without dumping more money. But, if it won't work, it won't work.