Connected load
List real loads in kW / kVA rather than estimating from building size alone.
RHELGAN Power & Energy Systems
POWER SYSTEM SELECTION GUIDE
Start with the load, not the generator badge.
RHELGAN POWER classes are repeatable planning references for international projects. They help structure early procurement, but final generator sizing still depends on real connected loads, motor starting, operating duty, future growth, altitude, ambient temperature and redundancy requirements.
Reference family
Five standard starting classes.
The values below are current 50 Hz Perkins reference configurations from the manufacturing technical schedule. Final project configuration can differ.
| System | Prime | Standby | Reference engine | Full-load fuel | Reference silent tank | |
|---|---|---|---|---|---|---|
| RHELGAN POWER 3030 kVA class | 28 kVA 22 kW | 30 kVA 24 kW | Perkins 404D-22TG | 7.1 L/h | 115 L | View |
| RHELGAN POWER 6060 kVA class | 60 kVA 48 kW | 66 kVA 53 kW | Perkins 1103A-33TG2 | 14.6 L/h | 135 L | View |
| RHELGAN POWER 150150 kVA standby class | 135 kVA 108 kW | 150 kVA 120 kW | Perkins 1106A-70TG1 | 30.28 L/h | 210 L | View |
| RHELGAN POWER 300300 kVA standby class | 275 kVA 220 kW | 300 kVA 240 kW | Perkins 1506A-E88TAG4 | 60.2 L/h | 770 L | View |
| RHELGAN POWER 500500 kVA standby class | 438 kVA 350 kW | 500 kVA 400 kW | Perkins 2206A-E13TAG6 | 75 L/h | 770 L | View |
Before sizing
The inputs that can change the answer.
Motor starting
Pumps, compressors, HVAC and treatment equipment can create short starting peaks well above running load.
Prime vs standby duty
Continuous or long-duration operation is a different duty from occasional outage backup.
Critical vs non-critical loads
Load shedding can reduce generator size where not everything has to remain energised during an outage.
Future expansion
Housing phases, additional pumps, new clinics or added treatment capacity can change the sensible starting class.
Climate + altitude
High ambient temperature and altitude can reduce available engine output and change radiator requirements.
Redundancy
One larger generator is not always preferable to multiple synchronised sets where uptime is critical.
Fuel logistics
Remote sites may need larger tanks, external storage or refuelling strategies that affect the package.
Local electrical standard
Frequency, voltage, phase, earthing, protection and emissions requirements are destination-specific.
System architecture
Then choose how the generator operates.
Silent & Weatherproof
For occupied, community and exposed sites where enclosure, ventilation and acoustic treatment matter.
Explore pathwayMobile Power
Trailer-based systems for field, recovery, construction and temporary infrastructure.
Explore pathwayContainerised & Parallel
For larger loads, redundancy, phased capacity and synchronised multi-set operation.
Explore pathwayATS & Automatic Backup
For automatic mains-failure start, transfer and return-to-mains operation.
Explore pathwaySolar + Battery Generator Support
For generator backup coordinated with project-engineered PV, battery, PCS and EMS systems.
Explore pathwayPlanning guide, not electrical design.
RHELGAN does not select a final generator solely from this table. A project quotation is based on the actual load schedule, destination electrical standard, duty, environment, controls, fuel system and required resilience.
RHELGAN · POWER & ENERGY SYSTEMS