Thanks to net metering, batteries are not required for you to maintain power 24/7. However, if there is a grid outage, your inverter turns off and your home will lose power just like everyone else. This is called anti-islanding and it exists to protect downed power lines and utility workers from power surges coming from solar arrays. If you want to maintain power during a grid failure, batteries are required. We install Tesla Powerwalls as our battery backup solution.