On adding inside outlet for plugging in USB

[Bob Miller]

I've been shocked by both pure sine wave inverters and square wave inverters and I gotta tell you, the sine wave inverters feel a lot smoother..... those darn square waves on the less expensive units can really hurt.

That said, I've used both and haven't found a case for the substantial extra cost of the pure sine wave versions.

[Night Sailor]

I bought a cheap 1000watt (really two 500 watt inverters in parallel) for $187. I did modify it somewhat, sheet metal instead of plastic side panels for shielding, and nuts and washers instead of thumbscrews. I wanted this for a TV, DVR, and BluRay player, and also for an electric blanket--which are known to have issues with modified square wave inverters.

I have several cheap 300 watt inverters which cost under $20. So it seems the cost for sine wave inverters is about 10 times the amount. I don't think anyone makes a 300 watt pure sine wave inverter. That being said, my inverter has seen daily use for a few weeks now with no issues. I am wondering how it would hold up, if I started using it for running heavier loads.