Onan 75kW Natural Gas Genset Standby Generator
Model #75, estimated to be a mid 1980s model
Engine: Ford industrial 8-cylinger engine with 1,122 hours on meter.
Power Output:
Three-Phase Power: Rated at 75 kW (93.8 kVA) at a standard 0.8 Power Factor (PF).
Single-Phase Power: Rated at 50 kW (62.5 KVA).
Bidders are encouraged to inspect
It is in fair used condition.
Sold AS-IS
Good Luck Bidding
The following general information is web-sourced and may contain variances from the subject unit:
The Onan 75.0ENT-15R/28948A is a heavy-duty, commercial-grade standby generator system engineered by the Onan Corporation Built as a robust industrial power solution, this "ENT" series unit utilizes a revolving-field, 4-pole brushless generator end combined with a reliable Ford V8 engine. It is highly valued for its ability to be reconfigured for different electrical requirements depending on whether it is wired for single-phase or three-phase power.
Electrical Performance & Specifications
The model code and specification plate reveal several crucial details about its electrical capabilities:
- Dual-Phase Capability: This generator features a re-connectable alternator end. Depending on how the output leads are configured, it supplies:
- Three-Phase Power: Rated at 75 kW (93.8 kVA) at a standard 0.8 Power Factor (PF). This is its maximum capacity, ideal for industrial machinery, large commercial buildings, or three-phase electrical panels.
- Single-Phase Power: Rated at 50 kW (62.5 KVA). When downrated to single phase, it is optimized for typical residential or light commercial backup power.
- Operating Speed: It operates at 1800 RPM, which is standard for high-durability, long-life industrial generators. Running at a lower RPM (compared to 3600 RPM portable or residential units) drastically reduces mechanical wear, lowers noise pitch, and extends the engine's lifespan.
- Frequency: 60 Hz, matching standard North American electrical grids.
- Voltage Code ("15R"): In Onan's historical nomenclature, the "15R" designation indicates a wide-range, 12-lead re-connectable voltage design. This means a qualified electrician can configure the machine to output various common voltages (e.g., 120/240V single phase, 120/208V three-phase, or 277/480V three-phase).
Engine & Fuel System
- Ford 8-Cylinder Engine:
This unit features a heavy-duty Ford industrial V8 engine (typically from the LSG V8 family, such as the Ford 7.5L/460 ci or LSG-875 series). These pushrod V8 engines are famous in the generator world for massive low-end torque, absolute reliability, and easy parts availability through industrial supplier networks. - Gaseous Fuel Subsystem: The engine is factory-configured for Natural Gas (NG) but can also run on Liquid Propane (LP) vapor with minor adjustments to the carburetion demand regulator. Natural gas is highly advantageous for standby applications because it hooks directly to utility lines, eliminating fuel storage degradation issues common with diesel or gasoline.
- DC Electrical System: Runs on a standard 12V battery system for the electric starter and automatic control panel logic.
Key Structural & Operational Features
- UR-Series Brushless Generator End: The ENT series uses Onan's legendary UR alternator design. Because it is brushless, it eliminates the primary wear points found in older generators, resulting in minimal maintenance and lower electrical noise interference.
- Solid-State Voltage Regulation: Features internal automatic voltage regulation (AVR) designed to maintain voltage stability within ±2% under shifting loads.
- Standby Engineering: This system is built for emergency standby power, meaning its components, cooling system, and structural layout are optimized to sit idle for periods and start automatically during an outage.
Terms of Sale:
All sales are final. No refunds will be issued. This item is being sold as is, where is, with no warranty, expressed written or implied. The seller shall not be responsible for the correct description, authenticity, genuineness, or defects herein, and makes no warranty in connection therewith. No allowance or set aside will be made on account of any incorrectness, imperfection, defect or damage. Any descriptions or representations are for identification purposes only and are not to be construed as a warranty of any type. It is the responsibility of the buyer to have thoroughly inspected this item and to have satisfied himself or herself as to the condition and value and to bid based upon that judgment solely. The seller shall and will make every reasonable effort to disclose any known defects associated with this item at the buyer request prior to the close of sale. Seller assumes no responsibility for any repairs regardless of any oral statements about the item. Seller is NOT responsible for providing tools or heavy equipment to aid in removal. Items left on seller premises after this removal deadline will revert back to possession of the seller, with no refund.
