Well, I finally got the other half of my cord from Amazon to update. Then one of the gray update cords that they sent was bad. Of course I picked the bad one first. Finally figured that out. Got my two May 2022 6500ex’s updated to the latest and greatest firmware. My pulsing compressors and pulsing/flickering lights during 2 ton 14 SEER soft start equipped heat pump start up is still there although it is less than it was originally before updating firmware. Frequency seems to jump from 60 to 62 Hz, voltage drops very little, but my heat pump compressor, my little refrigerator compressor and LEDs flicker like crazy for 6 to 8 seconds until it finally smoothes out. I don’t know what’s wrong with it. I know someone didn’t do proper testing before they sent these out of the factory and distributor. It wouldn’t be hard at these distributors to have a three ton heat pump with soft start setup with good quality LED’s like I have to test a unit every 100 or so. The same heat pump ran just fine for 18 months on my two SolArk12K’s. I have no grid power and no generator feeding these two 6500EX’s.
I’ve sent this information to Travis at SS. Awaiting a response.