Jackery Parallel Connector for Explorer 2000 Plus Portable Power Station

Works but bad instructions
Unit worked but the included instructions did not. I was able to verify 240v (238v measured) split phase output with a multimeter and used the units to power a 240v/208v clothes dryer via the 4 pin receptacle. I also verified that the 3 pin outlet provided a 240v output – although no testing was done using this receptacle. I made a test fixture and was able to capture images of the waveforms on an oscilloscope. The first image is the unloaded output waveform and the second is the output waveform when driving the clothes dryer. Based on the Jackery displays, one line was drawing 2894 watts while the other was drawing 2648 watts; the difference most likely due to the dryer motor and controls only being driven by one of the power lines. These values were in line with external power measurements being made at the time so there is no reason to believe they are not correct.The reason for the 4 star rating are the provided instructions. The first reason is that I could find no documentation prior to purchase as to what receptacles sizes are. They are marked on the unit but difficult to see on the pictures on websites. On my unit the 4 pin receptacle is 14-50R (R is for receptacle, the mating plug is 14-50P). The 3 pin receptacle appears to be a standard 6-50R receptacle (although it is marked as QJ-50R-6 for some reason). Likewise, the mating plug would be 6-50P. The second reason is that the operating instructions provided did not work. Installing the cables did not illuminate the parallel connector icon; turning on the main power did not result in 240V out of the unit. What did work is installing the cables, turning on the main power, then turning on the AC Power control (unmarked buttons next to 120v outlets). After turning on the AC power, the parallel icon for that unit lit. After about 5 to 10 seconds, the two lights on the parallel connector came on. At that point 240v (238v measured) was available on the connector.If you can see the images clearly, there was no drop in voltage due to the load but there is some waveform distortion under load. Not sure if this is the result of the clothes dryer or the unit operation under load. I am not able to measure total harmonic distortion (THD) at this time.