Overview#
The Airman SDG400 is the flagship of Airman's portable diesel lineup, delivering 320 kW of prime power (400 kVA) from an Isuzu 6WG1X engine at 1,800 RPM. With a massive 491-gallon integral fuel tank, the unit provides 21.3 hours of runtime at full load — enough for overnight operation at large construction sites and emergency power applications.
At 17,042 lbs operating weight, the SDG400 requires a heavy-duty trailer and is positioned for major construction projects, data center temporary power, and large commercial emergency standby. Like all Airman units, it includes 110% fluid containment as standard and carries the brand's documented 0.001% warranty claim rate heritage.
The Isuzu 6WG1X Platform#
The Isuzu 6WG1X is a heavy-duty turbocharged diesel engine from Isuzu's largest industrial platform, purpose-built for demanding applications that require sustained high output with exceptional reliability. This engine family powers heavy-duty trucks, mining equipment, and marine applications worldwide, translating to deep parts inventories and technician expertise across Isuzu's global dealer network. In the SDG400 application, the 6WG1X runs at 1,800 RPM with Tier 4 Final emissions compliance, producing 320 kW prime with reserve capacity for transient loads. The engine's conservative power density — running well within its design limits at this rating — is a key contributor to the extended service intervals and the documented 0.001% warranty claim rate that define the Airman brand at every power level.
Our Service Experience#
The SDG400 is the flagship of Airman's portable lineup and the unit we deploy on our most critical power applications in Northern California. We see it on major commercial construction projects in downtown San Francisco and San Jose, data center build-outs in Santa Clara, and campus emergency standby for technology companies throughout Silicon Valley. At 320 kW prime, the SDG400 handles entire building electrical systems — a capability that puts it in direct competition with CAT XQ and Doosan G-series units at this power class.
At 17,042 lbs, the SDG400 requires flatbed delivery and crane or forklift placement. The 491-gallon integral tank provides 21.3 hours at full load, which typically translates to daily fuel deliveries on construction projects running at or near full capacity. For extended deployments, we follow the standard 250-hour oil change interval and recommend a comprehensive fluid analysis at each service visit. The Isuzu 6WG1X has demonstrated excellent reliability in our fleet — these units run for thousands of hours between major service events when maintained on schedule. The primary maintenance focus is fuel quality and filtration, which is true across the entire Airman lineup.
