sunshine_eggo
Happy Breffast!
So the question is will I need more hardware for lom detection in the USA?
No. It's automatic based on what's happening at AC Input 1.
Side note:
LOM exists even if ESS is not in use.
LOM detection can be annoying for users using grid as backup. They will set various criteria for "ignoring AC input". Once the criteria are met to ignore AC input, this will trigger LOM (mains are actually preset - they are just being ignored) alarm. Most prefer to disable LOM function in the cerbo to get rid of the error.