The Airman SDG25SV-8E1 is a 25 kVA V-Pump variant that integrates a Mitsubishi FR-F800 variable frequency drive for motor starting and dewatering applications. Based on the SDG25S platform with an Isuzu 4LE2T engine, the V-Pump variant enables direct pump motor control without external VFD equipment. Standard 110% fluid containment and EPA Tier 4 Final compliance. Built by Hokuetsu Industries in Japan. At 2,227 lbs operating weight with a 52-gallon fuel tank, the SDG25SV is compact enough for tight job sites while delivering the integrated VFD capability that would otherwise require a separate piece of equipment.
The defining feature of the SDG25SV is its factory-integrated Mitsubishi FR-F800 variable frequency drive. In conventional dewatering setups, contractors rent a portable generator and a separate VFD, then cable them together on site. The V-Pump variant eliminates that complexity — the VFD is factory-matched to the Isuzu 4LE2T generator output, providing clean, controlled power directly to pump motors. This enables precise speed control for submersible and trash pumps, soft-starting capability that reduces mechanical stress on pump impellers, and the ability to match pump output to actual dewatering demand rather than running at full speed continuously. The result is lower fuel consumption, reduced wear on pumping equipment, and a simpler jobsite footprint.
The SDG25SV fills a specific niche in our rental fleet — dewatering applications where contractors would otherwise need to source and connect a separate VFD. We deploy it on foundation excavation projects across the Bay Area, particularly in the low-lying areas near the San Francisco Bay where high water tables make continuous dewatering essential during below-grade construction. The integrated Mitsubishi drive has been reliable in our fleet, and the 20 kW prime rating provides enough headroom for most single-pump dewatering setups.
At 2,227 lbs, the SDG25SV is light enough for pickup truck transport to smaller sites. The 52-gallon tank keeps refueling manageable for multi-day pump runs. Maintenance follows the same 250-hour oil change schedule as the standard SDG25S platform — the Isuzu 4LE2T is a proven small diesel with excellent parts availability. The primary service consideration unique to the V-Pump variant is periodic inspection of the VFD cooling system and drive connections, which we include in our standard service protocol.
Engineering specifications
Physical
Length
67 in
Width
35 in
Height
55 in
Dry weight
1,830 lb
Wet weight
2,227 lb
Fuel system & runtime
Integral fuel tank
52 gal
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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
43.8 hours(1.8 days)
Fuel consumption ≈ 1.19 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 Airman SDG25SV V-Pump under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Air filter
Every 500 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 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
Fuel filter
Clogging from contaminated or stale diesel causes hard starting and power loss — replace at 500-hour intervals or sooner if fuel quality is suspect
500+
minor
Starting battery
Capacity degradation during extended storage without a maintainer — test under load at every service visit and replace proactively at 36 months
4,380+
minor
Coolant hoses
Weeping at clamp points from thermal cycling — inspect during every oil change and replace at first sign of swelling or seepage
5,000+
minor
Frequently Asked Questions
What is the standby rating of the Airman SDG25SV?
The Airman SDG25SV delivers 22 kW standby / 20 kW prime at 60 Hz — the same power rating as the standard SDG25S platform, with the addition of an integrated Mitsubishi FR-F800 variable frequency drive for direct pump motor control.
What engine does the Airman SDG25SV use?
The SDG25SV is powered by an Isuzu 4LE2T — a 2.2-liter turbocharged four-cylinder diesel running at 1,800 RPM with EPA Tier 4 Final compliance. It is the same proven engine platform used in the standard SDG25S.
What is Airman's warranty claim rate?
Airman generators are built by Hokuetsu Industries in Japan and carry a documented 0.001% warranty claim rate — the lowest in the portable generator industry. This figure reflects the precision manufacturing standards applied to every unit built at the Hokuetsu facility.
What are the service intervals for the SDG25SV?
The Isuzu 4LE2T engine in the SDG25SV requires oil and filter changes every 500 hours or 12 months (whichever comes first), air filter replacement at 500 hours, fuel filter replacement at 500 hours, and is rated for major overhaul at 20,000 hours. The integrated VFD cooling system and drive connections should be inspected at each oil change service.
Is the SDG25SV EPA compliant?
Yes. The Airman SDG25SV meets EPA Tier 4 Final emissions standards through its Isuzu 4LE2T engine — without requiring a diesel particulate filter regeneration cycle. The unit is California-compliant for construction and dewatering applications.
What fluid containment does the SDG25SV have?
All Airman generators, including the SDG25SV, feature 110% fluid containment as standard. The integrated drip tray holds more than the total volume of all engine fluids, eliminating the need for separate secondary containment on California job sites.
Who services Airman generators in Northern California?
OnPoint Generators is the authorized Airman service provider for Northern California. We stock parts, perform warranty service, and offer maintenance contracts for the full Airman SDG V-Pump lineup including the SDG25SV.
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