Kohler · REOZ Series (Diesel Commercial Standby)

Kohler 50REOZK

50 kW standby / 45 kW prime · Diesel · Liquid-cooled

50 kW diesel commercial standby generator. Kohler-powered diesel for commercial, healthcare, education, and government standby applications.

Kohler Kohler 50REOZK generator — specifications and details
Standby power
50 kW / 45 kW prime
Voltage options
120/208V, 277/480V, 120/240V
Frequency / Phase
60 Hz · 1/3-phase
Engine
Kohler KDI 3404TM · 3.4L
CommercialHealthcareGovernment
Configure & QuoteDownload spec sheet

Overview#

The Kohler 50REOZK is a 50-kilowatt diesel commercial standby generator powered by a Kohler diesel engine at 1800 RPM. It serves commercial facilities, healthcare, education, and government applications where diesel fuel independence is required. The unit features a 4-pole rotating-field alternator with Fast-Response permanent magnet excitation, low coolant level shutdown protection, and sustained short-circuit capability up to 300% of rated current for 10 seconds.

Our service experience#

OnPoint services Kohler REOZK diesel generators across Northern California. The 50REOZK is a common choice for mid-size commercial buildings, and we maintain these units on an annual PM schedule with semi-annual fuel quality inspection to prevent the fuel degradation issues common to low-runtime standby diesel.

Engineering specifications

Physical

Length
90.6 in
Width
41 in
Height
44.5 in
Wet weight
1,769 lb

Fuel system & runtime

Fuel use @ full load
4.6 GPH
Fuel use @ 75% load
3.5 GPH
Fuel use @ 50% load
2.4 GPH

Photos

Kohler 50REOZK — product photo

Documents & downloads

Spec sheets & manuals

Ready to order this model?

Configure your Kohler 50REOZK

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

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Estimate runtime for the Kohler 50REOZK

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Estimated runtime

56.4 hours(2.3 days)

Fuel consumption ≈ 3.55 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Kohler 50REOZK 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 2000 hours
Air filter
Every 500 hours
Fuel filter
Every 250 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.

ComponentSymptomTypical hoursSeverity
Fuel quality / degradationInjector fouling, hard starting, reduced power output4,380+moderate
Coolant thermostatOvercooling at light load, extended warmup time8,000+minor
Battery (starting)Slow crank, failed exercise, low voltage alarm8,760+minor

Frequently Asked Questions

What engine is in the Kohler 50REOZK?
The 50REOZK uses a Kohler diesel engine rated at 1800 RPM, EPA certified for stationary emergency standby use.
What enclosure options are available for the 50REOZK?
The 50REOZK is available with weather-protective and sound-attenuated steel enclosures rated for 186 mph wind loads, plus UL 142 listed subbase fuel tanks.

Compatible equipment

Engine

Transfer switches

More in the REOZ Series (Diesel Commercial Standby)

Kohler's diesel commercial standby series — 10 to 510 kW, John Deere and Kohler engines, built for life-safety loads.

View all 33models in this series →

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