Overview#
The Hipower HMW-405 is a 405 kW diesel standby generator built on the MTU 1600-series 12-cylinder platform. Manufactured in Olathe, Kansas, it delivers the full Hipower mission-critical certification package — NFPA 110 Level 1, IBC seismic Zone 4, and 200 mph wind rating — at the 400 kW power class. EPA Tier 4 Final and CARB compliance make it the go-to unit for NorCal data centers, hospital campuses, and utility installations operating under California's strict emissions regime.
At 405 kW, the HMW-405 serves facilities with medium-scale UPS critical loads, 300-600 ton cooling systems, or distributed emergency lighting and life safety systems in high-rise commercial buildings. The additional 35 kW over the HMW-370 provides meaningful headroom for facilities that need NFPA code-required capacity margins above connected load.
MTU Engine Platform#
The MTU 12V1600 series is a 12-cylinder V-configuration diesel with turbocharged-aftercooled induction, engineered by MTU (Rolls-Royce Power Systems) to deliver 30,000+ hours TBO — roughly three times longer than competing Perkins or John Deere engines at equivalent power levels. Higher cylinder count versus 10-cylinder alternatives means more torque at low RPM, which translates directly to better step-load acceptance and faster frequency recovery after large load additions.
MTU uses SCR (selective catalytic reduction) with diesel exhaust fluid for Tier 4 Final compliance, preserving combustion efficiency and fuel economy. In standby applications where engines operate infrequently but must perform reliably under full load, MTU's approach avoids the EGR-related combustion degradation and accelerated oil contamination that affects competing Tier 4 Final designs.
Mission-Critical Design#
Standard features on the HMW-405:
- NFPA 110 Level 1, Type 10: Life-safety standby, 10-second startup — required for hospitals, data centers, and essential electrical systems in high-rise occupancies
- IBC Seismic Zone 4: Pre-certified for California installations with no additional structural analysis required
- 200 mph wind certification: Qualifies for all US coastal and inland wind exposure zones
- Dual-wall sub-base tank: Integral secondary containment for NFPA 30, EPA SPCC, and local fire marshal compliance
- MTU DiASter remote monitoring: Optional SCADA integration for real-time fault logging, fuel trending, and predictive maintenance alerts
Paralleling Capability#
The HMW-405 supports multi-unit paralleling with isochronous load sharing. Typical deployment: two units in N+1 for 405 kW critical load (100% redundancy), or three units for 810 kW with one spare. Load sharing is managed through standard Hipower paralleling controls, compatible with Asco Series 7000 and Russelectric RPC paralleling switchgear. This architecture is standard in colocation data centers and large hospital electrical distribution designs.
Service and Maintenance#
Standard MTU service schedule: oil and fuel filter changes at 500-hour intervals using MTU-specification parts, air filter at 1,000 hours. DEF system: purge at every shutdown, fluid quality check at oil changes, dosing injector inspection at 4,000 hours. Major overhaul is not expected until 30,000 hours — well beyond the operational life of most standby generator installations. Only MTU-certified technicians should perform SCR system service and high-pressure fuel system diagnostics.
Our Service Experience#
OnPoint Generators provides MTU-certified service for Hipower HMW installations throughout Northern California. Our technicians service HMW-405 units at data center campuses, hospital electrical rooms, and utility switchyards across the Bay Area and Central Valley. We maintain factory diagnostic software for the MTU 1600 series and stock critical parts to minimize emergency repair downtime.
