The Kohler 500REZXD is a 500-kilowatt LPG industrial standby generator in an enclosed configuration. Rated at 362-500 kW standby depending on voltage, it uses a PSI/Doosan engine paired with a brushless permanent-magnet pilot exciter alternator at 1800 RPM. This is the largest unit in the REZX gaseous lineup, EPA certified for stationary emergency applications, with hurricane-rated enclosure options featuring 186 mph wind load rating.
At 500 kW, gaseous generators are at the upper end of what LPG can practically deliver in a single genset. The advantage over diesel remains: no on-site fuel storage, no SPCC compliance, and no fuel degradation concerns. However, propane consumption at this power level is very high, requiring substantial tank installations and reliable delivery infrastructure. For facilities on utility natural gas with a reliable pipeline, NG variants offer unlimited runtime without delivery logistics.
OnPoint Generators provides installation, maintenance, and emergency service for Kohler gaseous generators throughout Northern California. The 500 kW class represents the top of the gaseous lineup and requires specialized attention to fuel delivery components, gas pressure regulation, and the pilot exciter alternator during PM service. We structure comprehensive service programs for these large-format units.
Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Manufacturer-recommended intervals for the Kohler 500REZXD under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 12 months
Coolant change
Every 3000 hours
Air filter
Every 500 hours
Spark plugs
Every 500 hours
Major overhaul
≈ 8,000 hours
Load bank test
Every 12 months
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 / ignition
Misfire under load, cylinder dropout codes, rough idle
500+
minor
Turbocharger seals
Oil in intake, blue smoke, boost pressure loss
10,000+
moderate
Fuel pressure regulator / vaporizer
Hard starting, gas pressure fault, erratic idle
8,000+
moderate
Battery (starting)
Slow crank, failed exercise
8,760+
minor
Frequently Asked Questions
What is the standby rating of the Kohler 500REZXD?
The 500REZXD is rated 362-500 kW standby (362-625 kVA) depending on voltage configuration, operating on LPG at 60 Hz.
What fuel does the Kohler 500REZXD use?
The 500REZXD operates on LPG (propane). Natural gas and dual-fuel variants are also available in the REZX line.
What is the difference between RZX and REZX models?
RZX designates the open-frame (skid-mounted) configuration, while REZX is the enclosed (sound-attenuated or weather-protective) version. Both use the same engine-alternator package; the difference is the enclosure.
Similar models
B
Blue Star Power Systems
New
Blue Star NG500-01
500 kW standby · Natural Gas / LPG · Liquid-cooled
500 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 32L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
500 kW standby · Natural Gas / LPG · Liquid-cooled
450 kW prime-rated natural gas / LP generator from Blue Star Power Systems. PSI 32L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
600 kW standby · Natural Gas / LPG · Liquid-cooled
600 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 32L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
600 kW standby · Natural Gas / LPG · Liquid-cooled
540 kW prime-rated natural gas / LP generator from Blue Star Power Systems. PSI 32L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
650 kW standby · Natural Gas / LPG · Liquid-cooled
650 kW natural gas / LP standby generator from Blue Star Power Systems. PSI 32L V12 turbocharged-aftercooled, DSE DCP7310 controller, three-phase 208-600V.
