I have an old brick house in Central America with typical nasty wiring. I considered simply running a parallel system for the solar but would rather rip out the old and start fresh. I'd like it to go through the same panel but use breakers to isolate one from the other. I'm thinking something needs replacing I can isolate the solar and use the grid and when finished isolate the grid and revert to solar. This way if I move I can have a good reliable grid system for the new buyer.
Is this accomplished simply by using two, say, 100 amp breakers leading into the box? The grid here is 100a and the inverter, a Growatt 3k is less than that. Please excuse my ignorance. I never progressed in wiring more than connecting a stereo 30 years ago.