The Kohler KD1250-A is a 1250-kilowatt diesel industrial standby generator from Kohler's KD Series platform. The -A variant offers a different power rating configuration within the KD1250 frame size, delivering 1250 kW standby for large commercial and institutional facilities. The KD Series uses Kohler-designed engines and permanent-magnet pilot exciter alternators.
The KD Series is Kohler's large industrial diesel generator line, covering 800 to 4000 kW. Designed for mission-critical facilities, every KD Series unit carries UL 2200 listing and meets NFPA 110 Level 1 requirements when equipped with the necessary accessories. Hurricane-rated enclosures with 186 mph wind load ratings are available across the platform.
OnPoint Generators provides installation, maintenance, and emergency service for Kohler KD Series generators throughout Northern California. Our technicians are experienced with large diesel platforms in the megawatt class, including load bank testing, fuel system maintenance, and cooling system service for high-capacity industrial 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.
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
3.0 hours(0.1 days)
Fuel consumption ≈ 65.65 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 KD1250-A under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Coolant change
Every 6000 hours
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 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
Fuel quality / degradation
Injector fouling, hard starting, black smoke under load
4,380+
moderate
Turbocharger
Power loss, excessive exhaust smoke, oil at turbo seals
15,000+
moderate
Cooling system (hoses / thermostat)
Overtemperature fault, coolant loss, high EGT
10,000+
moderate
Battery (starting)
Slow crank, failed exercise, low voltage alarm
8,760+
minor
Frequently Asked Questions
What is the standby rating of the Kohler KD1250-A?
Per the Kohler spec sheet, the KD1250-A is rated at 1250 kW / 1562 kVA standby and 1120 kW / 1400 kVA prime continuous at 0.8 power factor, 60 Hz, 1800 RPM.
Is the Kohler KD1250-A EPA Tier 4 certified?
No. The KD1250-A is EPA certified for stationary emergency use. For Tier 4 Final compliance, see the KD1250-4 model which carries dual emergency and non-emergency certification.
What alternator type does the KD1250-A use?
The KD1250-A uses a brushless, permanent-magnet pilot exciter alternator — Kohler's standard for the KD Series large industrial diesel platform.
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