Connecting and Testing My Cheap Chinese inverter from AliExpress

Recently, I purchased what I thought was a 1600-Watt pure sine wave inverter from AliExpress to see how it would look and run. I found in the unboxing that it was not a 1600-Watt inverter but was reported to be an 800-watt inverter. It is a pure sine wave, but it did not pass our testing.
I used two vacuum cleaners, one is a 240 Watt and the other a 600 Watt. This invertor did run the 240-watt vacuum cleaner, but totally failed with the 600-watt vacuum. I cannot recommend this cheap Chinese inverter from Ali Express.
Link to my unboxing of the Cheap Chinese inverter from AliExpress: