You are getting some excellent cautionary advice
. Swapping inverters alone and “disabling “ ...who know what’s going on...but usually it is complex as several have pointed out and generally it’s best to put in a whole new system. I think it’s always a good idea to learn as much as possible about your boat. Lots of great books
on marine electrical
systems. It’s not extremely difficult to learn but pay an expert to review your plans and your work
before you plug
Follow every rule
. Buy the best equipment
and tools. Have a qualified person check your work
. Take your time, check everything twice. Smoke alarms. Fire extinguishers. The more you learn, the safer you will be...especially at sea.
Good luck, you sound intelligent and capable. Hit the books
Happy trails to you.
Mark and his solar
power loving manatee friends