Critical demand exceeds the economic range of one conventional set
Large hospitals, data centers, factories, commercial complexes and campuses usually need multiple feeders, load zones and complete auxiliary systems.
Large-Power Systems / Above 1MW
Diesel Generator Systems Above 1MW
Above 1MW, the decision is no longer simply a larger engine. Load priorities, unit rating, paralleling, N+1 redundancy, voltage, distribution, fuel autonomy, cooling, exhaust, monitoring and maintenance windows must be confirmed as one system.
Large Single SetsMultiple-Set ParallelingLow or Medium VoltagePhased Expansion
When Large-Power System Design Begins
When total capacity is high, a single failure is costly or expansion is planned, define the system topology before comparing unit ratings and brands
One megawatt is a practical entry point, not a model boundary. Two smaller generators can form a system above 1MW, while one large set may still be unsuitable because of maintenance, starting demand or redundancy requirements.
Power must remain during maintenance or the project will expand in stages
Multiple sets can enter by load and provide a practical path for N+1, maintenance windows and future capacity growth.
Equipment nameplate ratings are simply added together to select capacity
Starting demand, diversity, UPS and VFD behavior, power factor, environmental derating and future growth all change the requirement.
Only generator price is compared while distribution and fuel remain undefined
Paralleling switchgear, transformers, breakers, cables, tanks, refueling, ventilation, exhaust and testing often decide whether the system can be delivered.
Design Sequence from Load to System Capacity
Define must-run loads, starting sequence and acceptable failures before choosing single-set, parallel, redundant and voltage arrangements
A large-power system should not begin with a preset 1000kW model. Start from critical loads, required operating time, transfer window and failure consequences, then allocate capacity across generation, distribution, fuel and controls.
Separate life-safety, production-continuity and delayable loads
Record steady demand, starting current, harmonics, power factor and restoration order rather than connecting everything at once.
Separate total system capacity from unit rating
Total capacity may come from one large or several smaller sets; unit selection must also consider minimum stable load, efficiency and serviceability.
Define N, N+1, reserve quantity and maintenance windows
State which loads remain after any one set exits, how quickly reserve capacity enters and how a failed set is isolated.
Compare low-voltage collection with medium-voltage output
Use capacity, distance, current, existing busbars and transformers to compare 400V, 6.3kV, 10.5kV or project-specific options.
Define fuel, cooling, exhaust and noise limits at the same time
Runtime, ambient temperature, altitude, space and local rules affect derating, enclosure and auxiliary-system requirements.
Prove the system through staged loading, fault simulation and loaded records
Acceptance covers starting, synchronization, sharing, load changes, set exit, transfer, protection, alarms and recovery.
Product and System Configurations
Combine large single sets, multiple-set paralleling, N+1 redundancy and medium voltage around load, space and expansion strategy
HOHANK can organize systems above 1MW around different engines, alternators, enclosures and controls. The page explains configuration logic rather than treating three fixed ratings as the entire range.
One Generator Carries the Concentrated Load
Fewer units and simpler controls, but single-point failure, maintenance outages, delivery, lifting, light-load operation and future expansion require review.
Generators Enter Automatically as Load Changes
Synchronization, load sharing and automatic start/stop follow demand, improve part-load utilization and support maintenance and expansion.
Critical Capacity Remains After Any One Set Exits
For high-consequence facilities, reserve capacity, fault isolation, control redundancy and maintenance strategy must be proven together.
Reduce Long-Distance High-Current Low-Voltage Distribution
Where capacity is high, distance is long or the existing bus is medium voltage, evaluate 6.3kV or 10.5kV direct output or step-up connection.
Systems above 1MW may use 1–2MW-class single generators or parallel several medium and large sets for higher total capacity. Final rating, prime/standby definition, voltage and quantity follow the load study and project standard.
Ratings, Brands and Enclosures
Select engine, alternator and enclosure around unit rating, service network and installation conditions
Large projects can review Cummins, Weichai, Yuchai, Baudouin, Perkins, MTU and other engine platforms, paired with Stamford, Leroy-Somer, Marathon, Engga and other alternators. Coverage depends on rating, frequency, voltage, emissions and local service.
1.0–1.5MW-Class UnitServes as a large single-set entry or a building block in a multiple-set system.
1.5–2.5MW-Class UnitReduces set quantity but increases transport, lifting, cooling and service requirements.
System Capacity Above 2MWOften uses parallel sets for load following, redundancy and staged expansion.
Low- or Medium-Voltage ConnectionReview 400V, 6.3kV, 10.5kV or other schemes by current, distance and existing bus.
CumminsA common large-power option; confirm model by frequency, voltage and service network
WeichaiCovers medium-large and industrial projects with low- or medium-voltage options
YuchaiSupports large single and multiple-set systems subject to emissions and service needs
BaudouinLarge industrial power option where local parts and service availability are verified
Perkins, MTU and OthersFor specified-brand or premium projects, subject to manufacturer range and lead time
Open Plant-Room InstallationSimplifies service and integration while the room provides cooling, exhaust, fire and noise control
Sound-Attenuated or ContainerizedSupports outdoor deployment with verified cooling, airflow, lifting and maintenance access
Modular Power StationSeparates generation, paralleling, distribution, fuel and monitoring for phased delivery
Eight Parts of a Large-Power System
The generator is only the starting point; continuity depends on coordinated generation, control, distribution, fuel, cooling and verification
Customers need not master every engineering detail, but they should be able to verify each module's responsibility, interfaces and test results so gaps do not appear between supply packages.
Diesel Engine
Verify prime/standby rating, frequency, derating, fuel use, emissions, service network and parts availability.
Synchronous Alternator
Confirm voltage, insulation, temperature rise, short-circuit capability, excitation, AVR and parallel operation.
Generator Controller
Manages starting, protection, alarms, operating data and ATS or paralleling communications.
Paralleling and Bus Control
Executes synchronization, sharing, automatic dispatch, fault isolation, bus protection and priorities.
Low- or Medium-Voltage Distribution
Routes capacity by load class and building zone with fault, selective and grounding protection.
Fuel and Replenishment
Defines autonomy from required hours, day tanks, bulk storage, pumps, piping and local rules.
Cooling, Exhaust and Structure
Verifies airflow, radiators, exhaust backpressure, noise, fire protection, service space and lifting.
Monitoring, Testing and Service
Records operation, alarms, fuel, transfer and maintenance and completes load tests, training and spares handover.
Six Project Inputs
Define loads, redundancy, connection, environment, autonomy and delivery boundaries before comparing buildable system proposals
Current, starting and future demand
Provide load list, critical classes, starting methods, diversity, power factor, harmonics and planned expansion.
Standby or prime duty and allowable interruption
Describe utility conditions, annual hours, transfer window, critical interruption limits and restoration sequence.
Single set, multiple sets, N+1 and maintenance windows
Define capacity retained after one unit exits, expansion phases and the strategy during generator maintenance.
Frequency, voltage, busbar and distribution interfaces
Confirm 50Hz or 60Hz, low or medium voltage, existing transformers, ATS/STS, breakers and cable routes.
Space, environment, transport and regulatory conditions
Provide altitude, temperature, humidity, dust, noise, location, lifting route and emissions requirements.
Fuel, monitoring, testing and service capability
Define autonomy, replenishment, remote monitoring, load-test conditions, site personnel, local response and spares.
Typical Large-Power Tasks
Load variation, transfer windows and outage consequences differ by facility, so one fixed topology cannot fit every project
Center the design on redundancy, transfer evidence and maintenance windows
UPS, cooling, life safety, ATS/STS, fuel, monitoring, periodic tests and event records must prove capacity after one set exits.
Organize capacity and distribution around large-motor starting and production recovery
Production lines, pumps, compressors, cold stores and utilities determine starting strategy; paralleling supports expansion and maintenance.
Prioritize fire, security, lifts, tenants and public services
Multi-building feeder sequence, noise, fuel delivery, property operations and holiday testing belong in the system proposal.
Review a system above 1MW around the load profile, redundancy target and site connection
Share country and city, critical loads, starting methods, expected capacity, 50Hz or 60Hz, voltage, redundancy, environment, fuel autonomy and expansion plan. HOHANK engineers will define unit rating, quantity, brands, enclosures, paralleling, distribution and auxiliary scope.