Overview#
The Airman SDG45 delivers 36 kW of prime power (45 kVA) from an Isuzu 4LE2X engine, stepping up from the SDG40 into a larger enclosure with 80.5 gallons of onboard fuel for 28.75-hour runtime at full load. The unit produces switchable single and three-phase output from 120V through 480V.
At 3,337 lbs operating weight, the SDG45 remains towable and compact enough for urban construction sites while providing the power needed for mid-size commercial loads. Standard 110% fluid containment and Tier 4 Final compliance meet California environmental and emissions requirements.
Sizing Guidance#
The SDG45 sits at the inflection point in Airman's portable lineup where the enclosure steps up from the compact 67" x 31" frame shared by the SDG25 and SDG40 to a larger 74.8" x 38.2" platform. This larger enclosure accommodates the additional cooling capacity required by the 36 kW prime rating and provides improved serviceability — wider access panels make oil changes and filter swaps faster in the field. If your loads consistently run between 25 kW and 35 kW, the SDG45 operates efficiently in that range without the stress of running a smaller unit near its ceiling. For loads that peak above 40 kW, step up to the SDG65.
Our Service Experience#
We deploy the SDG45 frequently on commercial construction projects throughout Silicon Valley and the East Bay — tenant improvement work in Sunnyvale and Mountain View office parks, restaurant build-outs in downtown San Jose, and retail fit-outs in Walnut Creek and Pleasanton. The 36 kW prime rating is the sweet spot for powering temporary lighting, tool circuits, and small HVAC equipment simultaneously during the rough-in phase of construction.
The Isuzu 4LE2X engine in the SDG45 shares its architecture with the proven 4LE2T in the SDG25 but with additional displacement to support the higher output. Field reliability is excellent — we see very few unscheduled service events on this model. The most common maintenance items are fuel filter replacements (especially on units that sit between jobs) and battery conditioning. We recommend keeping the fuel tank topped off during idle periods to minimize condensation, and using a quality float charger between deployments.
