Generally if you're grid-tied your setup needs to be approved by the power company and they have a surprising amount of say in what specific equipment by what vendors you can use. If you watch his videos on his specific home setup, he has a separate grid-tied system and his testing system and they don't touch. He even remarks that some of them wouldn't have been his choice.
I watched a video from the 8-bit guy about tying solar panels to the grid. He said that if you do that, your power fails at the same time as the grid's power, so you don't get any backup electrical power. For that reason, he recommended against tying your solar to the grid.
It’s completely possible to have backup power and be grid-tied. The main issue is your panels feeding the grid during a blackout, which can be dangerous for people trying to fix stuff. All that’s required (requirements will vary widely per region) is an automatic disconnect that disconnects your setup from the grid when the grid goes down. For example, Tthe new Enphase EQ8 micro inverters have an optional controller to do this. AFAIK the Enphase systems are the best selling micro inverter systems out there so new installations should have no issues being self sufficient during outages.
Anything that can be legally connected to grid has to be certified to stop supply back to grid in case of blackout. Is there any region where this isn't the case? I doubt it.
