Mine is the same. A few years ago it stopped being blank when plugged into 50A and always shows 30A and the amperage draw, including shutting down the appliances when it goes above 30A. Fortunately, the amperage reading is erratic - I can have the AC, Microwave, fireplace, and W/D going and it may only read 12 amps, so it seldom goes into it's shutdown routine. I've tried all the usual fixes (unplugging inverter, circuit breaker resets, all the suggestions on this forum), but nothing works. I just live with it, it's not worth it to me to replace the circuit board and have it happen again.
Fulltiming in a 2006 Ellipse 40FD