With battery back up, a grid tied system will have power as long as the batteries are getting sufficient charge. That is the most expensive option however.
There are also charge controllers out there for grid tied, no batteries, that have 1 or 2 120v plugs so power can be supplied only when the solar panels are getting enough sun. But that’s really only for charging your cell phone and the like, not for running a major appliance.
I agree with Fred wholeheartedly. Total off grid solar or off grid hybrid is the way to go for prepping purposes.
