Not sure what you are looking for.
Most newer generators are in fact Alternators.
My house is solar - Battery - Generator. I can go completely off grid by just throwing a switch. In fact I have to throw the switch to start the generator and not back feed the power lines.
Takes about a 12 kv system to run a house like ours with a well. This time of the year with short days and low light the solar system has a tough time keeping up. We don't use as much water at this time of the year so that helps with load.