The Hipower HNI-300 is a 300 kW standby natural gas generator powered by the PSI 13LTHO — the high-output variant of PSI's 13-liter turbocharged spark-ignited engine. At 300 kW, this unit covers large commercial buildings, data centers, hospitals, and industrial facilities where natural gas supply from the utility is established and diesel standby creates operational or regulatory complexity.
CARB certification across the full HNI range (30–1000 kW) makes the HNI-300 one of the few non-Big-4 options at this power class that qualifies for California permit-by-rule — removing a significant approval step for California project teams.
The PSI 13LTHO is a high-output version of PSI's 13-liter turbocharged platform, running at 1800 RPM in stationary duty. PSI has supplied engines to multiple generator OEMs across North American commercial and industrial standby markets. The spark-ignited architecture eliminates diesel-specific aftertreatment: no DPF regeneration cycles, no SCR, no DEF. Service centers on spark plugs, oil changes, and gas system inspection.
At 300 kW, gas supply line sizing and meter capacity are critical infrastructure considerations. A mechanical engineer must confirm utility delivery against the generator's BTU demand at full load before finalizing the installation.
The HNI series holds CARB certification from 30 kW through 1000 kW. The HNI-300's certification qualifies it for California permit-by-rule, bypassing the source test and air district variance process that applies to non-certified engines. In this power class — 250–350 kW — California-compliant natural gas options outside the Big 4 are limited, making the HNI-300 a competitive specification.
OnPoint Generators services natural gas standby equipment throughout Northern California. At 300 kW, the HNI-300 is common in large commercial and light-industrial applications where facilities want to consolidate their energy infrastructure on natural gas and avoid diesel storage compliance. Our teams are trained on PSI spark-ignited platforms in this displacement class.
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Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Fuel demand at 75% load
3,150,000 BTU/hr≈ 3150.0 cf/min @ 1,000 BTU/cf
On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.
Service intervals
Manufacturer-recommended intervals for the Hipower HNI-300 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 1000 hours or 12 months
Air filter
Every 500 hours
Spark plugs
Every 1000 hours
Major overhaul
≈ 30,000 hours
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Spark plugs
Erosion from natural gas combustion — replace on schedule to prevent misfire under load
1,000+
minor
Gas pressure regulator
Pressure drop under high load — verify regulator capacity and supply line sizing
4,380+
minor
Ignition module
Cylinder dropout under load — per-cylinder coil diagnosis required
8,000+
moderate
Frequently Asked Questions
What engine does the HNI-300 use?
The HNI-300 uses the PSI 13LTHO — the high-output variant of PSI's 13-liter turbocharged spark-ignited engine platform, optimized for 300 kW standby output.
Is the HNI-300 CARB certified?
Yes. The full HNI series (30–1000 kW) is CARB certified. The HNI-300 qualifies for California permit-by-rule without an air district variance.
What gas supply infrastructure does a 300 kW natural gas generator require?
A 300 kW natural gas generator requires substantial gas flow. The gas supply line, meter capacity, and regulator must be engineered for the BTU demand at full load. A licensed mechanical engineer should assess utility delivery capacity before commitment. <!-- NEEDS VERIFICATION: HNI-300 BTU/hr and pressure requirements -->
Is natural gas reliable enough for critical standby at 300 kW?
Natural gas is delivered via underground utility infrastructure that is generally unaffected by the weather events (storms, ice) that knock out electrical power. For most California standby scenarios, gas reliability is high. Sites with seismic or infrastructure risk should conduct a site-specific risk evaluation.
How does the HNI-300 compare to diesel alternatives?
The HNI-300 eliminates diesel storage, SPCC compliance, fuel delivery, and DPF maintenance. For California facilities with gas service, CARB certification removes air district approval friction. The PSI 13LTHO platform has a service track record in North American standby applications.
Who services HNI-300 units in Northern California?
OnPoint Generators provides full-cycle service for Hipower HNI units in the 300 kW class throughout Northern California.
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