I would think if you didn’t trip the breaker yours is 15amp. You can look up the model of your inverter and it will tell you if it’s 15 or 20. My inverter is in the same bay as where the electrical hookup is.
Have you checked your house batteries? If they are low you might leave it plugged in for a while and let them charge. Maybe you were getting errors because of low battery. The noise you hear under your bed is probably your converter.
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