Is the inverter showing over volt or over current? What is it powering?
Is it getting too high of input voltage? Or is it showing over-current from AC draw?
If it's voltage, and your SCC is set to default or full boost voltage of 3.65Vpc, that's 29.2 volts. It's not unheard of for these controllers to over-volt, unless you set the 'maximum' voltage as an upper limit. Frankly I think that is too high for lifepo, I would set boost to 28.4, or even 27.6 with a longer duration to give the charger time to trickle your batteries at a lower charge voltage to reach full charge.
In my experience the SCC always reads higher than the batteries since they measure the system voltage with their charge current on top. If the inverter has a maximum voltage of 30V, it would well be reaching that. Set your charge voltage a little less, and/or your inverter for a little more, and run it, see if you still get an error.
Still curious about what gets powered with a 6kW inverter. Holy cow.