| Generator Set Type |
Open-frame, weatherproof, silent, mobile, or containerized configuration |
Choose an open-frame configuration for dedicated indoor plant rooms, weatherproof or silent housing for outdoor or noise-sensitive locations, mobile units for temporary sites, and containerized systems for larger outdoor installations. |
| Operating Rating |
Standby, prime, or continuous rating |
Use standby rating for emergency backup with limited annual operating hours, prime rating where load varies and the set operates for extended periods, and continuous rating for a steady load in a non-grid or base-load application. |
| Required Output |
Measured in kW and kVA |
List the running and starting demand of every load. At a power factor of 0.8, apparent power can be estimated as kVA = kW ÷ 0.8. Confirm the final rating with the equipment manufacturer or electrical engineer. |
| Load Growth Allowance |
Future expansion, seasonal demand, and additional equipment |
Add a documented engineering margin rather than selecting an excessively oversized set. A commonly used planning allowance is approximately 10–20%, subject to the actual load profile and project requirements. |
| Motor and Transformer Loads |
Pumps, compressors, elevators, HVAC equipment, and transformers |
Evaluate starting current, starting method, sequential starting, and allowable voltage dip. Variable-frequency drives or soft starters may reduce starting demand, but their harmonic and compatibility requirements must also be checked. |
| Voltage and Frequency |
Single-phase or three-phase; 50 Hz or 60 Hz; low- or medium-voltage systems |
Match the generator to the site supply, connected equipment, phase arrangement, neutral configuration, and local grid frequency. Confirm whether the installation requires a separately derived system. |
| Fuel and Runtime |
Diesel fuel system, tank capacity, fuel quality, and required autonomy |
Size the tank for the required operating duration while considering site regulations, fuel storage limits, refill access, ambient temperature, and fuel turnover. Follow applicable standards for storage and handling. |
| Automatic Transfer |
Manual transfer switch or automatic transfer switch |
Use an automatic transfer switch for critical facilities that require rapid backup operation. Verify transfer time, bypass-isolation needs, generator start logic, retransfer settings, and utility interlocking. |
| Installation Environment |
Altitude, ambient temperature, humidity, dust, salt, and restricted ventilation |
Apply derating where required. High altitude and high ambient temperature reduce available engine and cooling performance. Provide adequate combustion air, radiator airflow, exhaust clearance, and service access. |
| Noise and Emissions |
Acoustic enclosure, exhaust treatment, and local emissions compliance |
Check local noise limits, exhaust requirements, fuel regulations, and workplace rules before purchase. Do not rely on enclosure claims without confirming the test conditions and measurement distance. |
| Control and Monitoring |
Local controller, remote monitoring, alarms, and communication interface |
For 2026 projects, consider remote status, event logs, fuel-level monitoring, battery condition alerts, load monitoring, and integration with building management or supervisory control systems. |
| Parallel Operation |
Single generator or synchronized multiple-generator system |
Consider paralleling when the project requires higher capacity, redundancy, staged loading, or improved fuel efficiency at partial load. Confirm synchronization, load sharing, protection, and control-system compatibility. |
| Maintenance Planning |
Service intervals, spare parts, technician support, and testing schedule |
Compare total cost of ownership, not only purchase price. Plan routine inspections, battery checks, coolant and lubricant service, load-bank testing, fuel maintenance, and emergency repair access. |
| Recommended Decision Sequence |
Load survey → rating selection → site assessment → compliance review → lifecycle-cost comparison |
Prepare a complete load schedule, identify starting loads, apply environmental derating, select the operating rating, verify installation constraints, and obtain a compliant technical quotation before placing the order. |