Overview#
The Hipower HNG-400 is a 400 kW stationary natural gas standby generator and the largest model in Hipower's HNG series. Built in Olathe, Kansas, the HNG-400 is CARB certified for California natural gas standby applications. Above 400 kW, Hipower's HRNG series provides trailer-mounted natural gas generators for mobile and rental applications.
At 400 kW, the HNG-400 serves large industrial facilities, hospital campuses, large commercial developments, and data center applications. Natural gas supply from the utility eliminates diesel storage at this scale — which would require a large above-ground or underground tank with SPCC compliance, polishing, and regular delivery scheduling.
Gas supply engineering is a critical project component at 400 kW. A licensed mechanical engineer must size the complete gas system for the full-load BTU demand, and early utility coordination for a service upgrade is essential. Projects that successfully engineer the gas infrastructure gain the operational benefit of utility-supplied fuel and CARB-certified emissions compliance in one package.
PSI Engine Platform#
The HNG-400 is powered by a PSI natural gas engine running at 1800 RPM. PSI supplies spark-ignited engines to multiple standby generator manufacturers and maintains a broad parts and service network across North America. The specific PSI model designation for this output range is pending verification from OEM documentation — service follows standard PSI spark-ignited practice: spark plugs and oil at 1000-hour intervals, no DPF or DEF.
CARB-Certified for California#
Hipower's HNG series holds CARB certification for California natural gas stationary standby. The HNG-400 qualifies for California permit-by-rule — standard air district approval without source test. At this power class, CARB-certified natural gas stationary options from non-Big-4 manufacturers are rare.
Service and Maintenance#
- Oil and filter: 1000 hours or 12 months
- Spark plugs: 1000 hours
- Air filter: 500 hours
- Gas line and regulator: Annual inspection
- Major overhaul: 30,000 hours
Our Service Experience#
OnPoint Generators services large natural gas standby generators throughout Northern California. At 400 kW, the HNG-400 is at the boundary of large commercial and industrial standby — a scale where reliable maintenance programs and periodic load-bank testing are essential for standby confidence. OnPoint provides comprehensive service for large Hipower installations.
