150W Sine Wave Power Inverter by Battery Power Solutions

When I bought my first battery for the CPAP, I could never get it to last all night with my current CPAP. So out of my own money I bought a small one. I was very disappointed that the battery didn't last all night. It died after 2hours. I thought it was the battery but finally realize it was the darn inverter---same manufacturer. So I took a change and bought this! Works great. I saw the post about noise---it's got a fan which keeps it from overheating. The fan in my old one I think is unbalance and thus it would overheat after 2 hours. The fan is no silent but it's white noise and you get over it quick if you are tired. Without the inverter I can't run either CPAP and I'd be a LOT more tired.

it is a common modified sine wave inverter, a square wave that the controller modulates the width of to control power out. i think the seller did not mark it as modified sine wave as is common practice so those of us that are looking for a pure sine wave inverter will buy... and of course be disappointed.i checked the output on my scope.$20, 200W inverter on amazon is exactly the same output and a far better value.

Works great! We use this on our boat and when we go camping for my husbands CPAP.

It has a low hum/whinny noise. I bought it because I use it in my car and wanted to eliminate feedback noise when I am charging my phone and listening to music or books while driving. It is much better than a $15 power source I would say it produces half the level hum/whinny noise. It has recently started making a noise from the fan like it is rubbing up against something I have an old cheap model, a different brand that did the same thing but I pay five dollars for it.

Connecting point weak. Otherwise good item but handle carefully.

Works as advertised.

Very nice. Used it last night to power my CPAP from an old C-220 and it never made a noise, at least none I could here. The best inverter I've had so far.

Does this look like a sine wave to you?Although not mentioned on the Amazon website as of this writing, the manual makes reference to a "Modified" sinewave.The waveform looks virtually identical to other 150 Watt inverters I have purchased on Amazon for $16.98.