Engineering screening only. This tool does not establish statutory emergency-power arrangements, required emergency loads, permitted transfer times, battery duration, fuel endurance or redundancy. Actual design depends on vessel type, flag, class, approved single-line diagrams, protection settings, generator excitation and governor response, motor starting method, transformer inrush, UPS topology, battery chemistry and aging, cable voltage drop, breaker coordination, ambient conditions and equipment-specific transient capability. Motor starting is modeled as a simplified apparent-power multiple and tier step loads are conservatively treated as simultaneous blocks. Validate final emergency-power and blackout-recovery decisions with the vessel's approved electrical documentation, OEM data, test records and qualified marine electrical engineering review.