Review on Nexus Escape 150 Watt Inverter PAD1500 by Ricardo Mercado

I purchased this unit, quantity (2) 7.5 amp batteries and quick charger. I wanted to use this to power the cpap machine. Check the power of the CPAP machine (80 watts) and this device (150 watts). fully charged batteries. and tested it on a cpap machine and reloaded that block in 2 seconds. Then I tried it on a couple of fans and it made a loud buzzing sound. Connecting lamps caused the same problem and dim light. did some research and found that these devices don't provide true AC power, but instead provide a square wave. this can cause a buzzing noise with some electrical devices. All of this was expensive and I spent a lot of money on it. Not sure if I can use this and not worth the cost. planned to buy a power plant, but now I'm not sure.