Overview#
The Airman SDG45SV-8E1 is a 45 kVA V-Pump variant featuring an integrated Mitsubishi FR-F800 variable frequency drive for motor starting and dewatering applications. Based on the SDG45S platform with an Isuzu 4LE2X 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 36 kW prime, the SDG45SV provides nearly double the capacity of the smaller SDG25SV, making it the choice for larger dewatering operations and sites that need to run pumps alongside other construction loads.
Integrated VFD Technology#
Like the smaller SDG25SV, the SDG45SV features a factory-integrated Mitsubishi FR-F800 variable frequency drive. The larger 36 kW prime rating allows the SDG45SV to drive bigger submersible and trash pump motors while still leaving capacity for auxiliary loads — site lighting, power tools, or temporary office trailers. The VFD provides soft-start capability that reduces inrush current and mechanical stress on pump impellers, precise speed control for matching pump output to actual dewatering demand, and the elimination of a separate VFD rental and its associated cabling. The Isuzu 4LE2X engine delivers reliable power at a moderate specific output, and the 80.5-gallon fuel tank extends unattended operation for continuous dewatering through overnight excavation phases.
Our Service Experience#
The SDG45SV is our mid-range dewatering solution for sites that need more capacity than the SDG25SV can deliver. We deploy it on larger excavation projects — parking structure foundations, basement dig-outs for mixed-use buildings, and utility trench work in areas with high water tables. The 36 kW prime rating gives contractors enough headroom to run a large submersible pump at variable speed while powering site lighting or a small compressor.
At 3,337 lbs operating weight, the SDG45SV still fits on a standard trailer for single-truck mobilization. The 80.5-gallon tank provides extended runtime for continuous pump operation — a meaningful advantage over the SDG25SV's 52-gallon tank during multi-day dewatering runs. Maintenance follows the same 250-hour oil change schedule as the standard SDG45S platform. The VFD cooling system and drive connections receive additional inspection during scheduled service visits, but the Mitsubishi FR-F800 drive has proven very reliable in our fleet with minimal drive-specific issues.
