Agricultural loads run continuously and are sized differently
Milking equipment, ventilation, cooling and irrigation run for hours at a time rather than in short bursts. Conductors and overcurrent protection for continuous duty have to be sized above the running load, and equipment selected on the nameplate figure alone runs hot, which shortens its service life and tends to end in a failure under peak summer load.
Three-phase equipment is routine on these properties
Motors, compressors and irrigation pumps here are frequently three-phase, which brings requirements a house never has, including correct rotation, proper starters and overload protection sized to the motor. It is standard agricultural work and rarely encountered in a residential subdivision.
Standby power is planned around ventilation and cooling
When power is lost on a livestock or greenhouse operation, airflow and temperature become time-critical within minutes. We plan standby power around which circuits have to stay live and in what priority, which is a different exercise from backing up a house.