This is a standard feature of every grid tie inverter. Unfortunately it also means you can't power your house when the grid is out unless you also have a batte

This is a standard feature of every grid tie inverter. Unfortunately it also means you can't power your house when the grid is out unless you also have a battery attached. Not that you would want to run appliances with the power dipping out randomly anyway. Maybe to charge a laptop/phone or run basic incandescent bulb/electric space heater/toaster type loads.