Overview
The 28SI is a high-output brush-type heavy-duty alternator offering up to 200A at 12V or 110A at 24V, targeting vehicles that need strong charging performance without the premium of a brushless design. Its dual internal fan cooling system sustains rated output under demanding underhood temperatures up to 125°C, while standard Remote Sense technology actively compensates for voltage drop to cut battery charge time by up to 50%.
Key Features
- Brush-type design; 12V up to 200A, 24V at 110A
- Dual internal fan (DIF) cooling for sustained output in high-heat environments
- Remote Sense standard — reads battery terminal voltage and compensates for line voltage drop
- J180 short hinge, J180 long hinge, and pad mount options
- Temperature rated to 125°C / 257°F; 10,000 RPM continuous / 12,000 RPM intermittent
- Lightweight at 18.7 lbs (8.5 kg); 12V efficiency up to 66%, 24V up to 76%
Applications
- School buses
- Transit and coach buses
- Heavy-duty commercial trucks (Freightliner, Western Star, Hino)
- Fleet and municipal vehicles with elevated electrical demand
