The amps go up and down at the heat pump and solar assistant shows the watts spiking up and down. The heat pump will make weird noises until I turn another high load on for 10 secs or more depending on the amount of solar coming in. My only solution so far is to use relays to turn on a heat strip for 10 secs but that is only effective if 3k or solar, more and it needs to stay on longer. Instead I got a split unit heat pump to see if it does it, and it does not. When I had MPP lvx the fix was just a simple cap at the AC output. Did not work for the EG4.
We want details and info if you can share, sounds bad with or without a cap, have you tried any other heat pump?