What happens when there is a blackout on the grid?

On grid- tied systems , the inverter is designed to automatically shut-off when the electrical power from the utility grid is no longer present. This is to prevent what is known as islanding. Its a safety regulation to protect electrical utility workers from being electrocuted. Once the inverter detects grid electricity again, it will turn back on and start producing power.

Grid tied systems can also be designed with a battery backup system to provide electricity in the event of a blackout. These batteries will be able to power a dedicated sup- panel or load that is isolated from the utility. This can be helpful in areas that experience multiple blackouts a year and/or lengthy outages.