Moallam

It could be excessive bias (measured current at start-up when the current should be zero) from one or more of four current sensors:
output (load) current (there is a current transformer, it looks a bit like an audio transformer) inverter current (an LEM hall effect sensor I believe) output current sharing sensor (might be on the paralleling board? You could try removing that temporarily if you have one) the DC2DC current sensor. I believe that this is something unique to models with the 450 V max MPPTs, so I don't know anything about them. Unless you have an unusual load which has asymmetrical current (hair dryer on half power?), it doesn't look like something you can repair yourself. Perhaps attempt to demagnetise the CT or LEM, but that's about it.
Failing any of the above, it looks like you'll have to get it repaired or replaced under warranty, and I'd say it would be a main-board replacement. This is the most expensive part of the inverter-charger. It sounds like it's brand new (two days of service?), so unless you have any nasty loads, it looks like you should be able to get a warranty replacement. Unfortunately, with high demand and the COVID-19 situation, it may take some time to get resolved.