41-50 kW gaseous-fueled commercial standby generator with Brushless Rare-Earth Permanent-Magnet alternator. Industrial gaseous unit for commercial backup on natural gas or propane.
The Kohler KG45 is a 41-50 kW commercial standby generator in Kohler's industrial gaseous (KG) lineup. It uses a Brushless Rare-Earth Permanent-Magnet alternator with fast-response excitation and runs on natural gas or LP propane with field-selectable fuel switching. Rated output ranges from 41 to 50 kW depending on fuel type and voltage configuration.
The KG45 slots between the KG40 and KG50, offering a mid-step option when the KG40 is undersized but the full KG50 rating is not needed. It shares the same industrial platform and EPA Stationary Spark Ignition certification as the rest of the KG line.
The KG45 shares the same engine and alternator platform as adjacent KG models, so service patterns and parts are consistent across the series. We see these units in small commercial buildings, telecom sites, and light industrial facilities.
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.
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
525,000 BTU/hr≈ 525.0 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 Kohler KG45 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 200 hours or 12 months
Coolant change
Every 2000 hours
Air filter
Every 500 hours
Spark plugs
Every 500 hours
Major overhaul
≈ 6,000 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, rough running, cylinder dropout codes
500+
minor
Fuel pressure regulator
Hard starting, unstable idle, gas pressure fault
6,000+
moderate
Battery (starting)
Slow crank, failed exercise, low voltage alarm
8,760+
minor
Frequently Asked Questions
What is the standby power rating of the Kohler KG45?
The KG45 is rated 41-50 kW standby at 60 Hz depending on fuel type and voltage configuration. It sits between the KG40 and KG50 in Kohler's industrial gaseous lineup.
Does the KG45 run on natural gas or propane?
Both. Like all KG-series units, the KG45 is dual-fuel NG/LPG with field-selectable switching.
What type of alternator does the KG45 use?
The KG45 uses a Brushless Rare-Earth Permanent-Magnet alternator with fast-response excitation. This provides sustained short-circuit capability up to 300% of rated current for 10 seconds.
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