@tygerbergtax 100% split the distribution board first before you buy a single inverter. Industrial compressors and direct-on-line motors have massive inrush currents (up to 6x rated kW) that will trip a hybrid inverter instantly unless they have VSDs (Variable Speed Drives). Put your office, server rack, lighting and control electronics on the essential backup bus, and if the 11kW machine must run on backup, fit a soft-starter/VSD and look at parallel 3-phase Deye 12kW or Victron Quattro units with at least 30kWh of LiFePO4 rack batteries.