Heavy Duty Alternators: High Efficiency
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Delco Remy manufactures the two highest rated efficiency alternators in the industry; the 36SI™ and 40SI™. Both have a durable brushless design with high output to support a large variety of applications. Each alternator model operates in the 70% peak efficiency range. |
36SI™
40SI™
High Efficiency White Paper
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| Application | Average Current | Fuel Cost with base Efficiency | Fuel Savings with higher Efficiency |
| Line Haul Tractor | 84 amps | $3778 / 500k mi | $756 / 500k mi |
| City Tractor | 40 amps | $1863 / 350k mi | $372 / 350k mi |
| School Bus | 102 amps | $7533 / 250k mi | $1507 / 250k mi |
Case studies of three different real-world applications were completed for a line haul tractor, city tractor and school bus. Real-time operating data was collected on each of these applications for the overall vehicle and electrical system. This measured data serves as the baseline for each of these three studies.
The table represents fuel cost savings over a typical life cycle when alternator efficiency is increased to the range of the 36SI and 40SI over standard industry models. Note the significant fuel savings for each application. For more information about alternator efficiency, read the white paper titled: Improving Alternator Efficiency Measurably Reduces Fuel Costs.
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