My UPS is my hybrid inverter. It offers at least 1kWh of usable capacity (after losses), more of the sun is up or the battery is charged above 20%.
Of course there is no native signaling on grid loss, but in practice that's not an issue; for planned maintenance I can force charge the battery and keep the servers running for a day or more, and actual power loss incidents are very brief in my corner of the woods.
Of course there is no native signaling on grid loss, but in practice that's not an issue; for planned maintenance I can force charge the battery and keep the servers running for a day or more, and actual power loss incidents are very brief in my corner of the woods.