Bests & Worsts Reviews from Amazon

I did some reviews searching before purchasing this unit, thought I got a good deal of decent product with a fair price. I did some tests before installing it to my RV, and I realized this product had big problem on the data showing on the screen. I tested by using a professional power meter and also tried by the microwave. The screen showed bigger number than the appliance actual is. Hmmm, it made me wonder if the inverter itself had some hidden data that messed up the showing, since I have tested by using different appliances. Also it cut down when I was trying 3000w. How comes if that is supposed to be a 4000w inverter. Anyhow, don’t recommend this product.