All directly grid-connected inverters have backfeed protection built-in. Bigger installations can have automatic switching from the grid to the inverter, much

All directly grid-connected inverters have backfeed protection built-in. Bigger installations can have automatic switching from the grid to the inverter, much like an uninterruptible power supply. (This is technically possible with smaller installations as well, just uncommon, since it doesn't make a lot of sense)