Originally Posted by Take_a_hike
Just called ETI . Spoke to Reace, he suggested checking the battery connections. One was quite loose. Kevin tightened them and .... problem solved!
So it was
too much resistance, but due to a loose connection rather than undersized wiring. It's good that you found this, since that connection (presumably for one of the dedicated cables to the inverter) would have been getting hot every time you used the inverter.