What is the size of the inverter?

The Redback Tech SH5000 Smart Hybrid inverter is a DC coupled 5000W inverter capable of handling 21A load on the backup circuit

Redback SH5000 

The SH5000 Smart hybrid inverter is a DC-coupled 5000W inverter with 2 MPPTs, a close-coupled battery cabinet capable of handling a maximum 11.8kWh battery, and we typically charge it from 6.6 kW PV modules (solar panels).