Division 3.3 Electric system
United Kingdom
For the electric system power the standard values [W] as shown in Table 5 shall be used depending on the application and technology in combination with the alternator efficiencies:
Table 5
Electrical power demand of electric system
| Technologies influencing electric power consumption | Electric power consumption [W] | ||||
|---|---|---|---|---|---|
| Long haul | Regional delivery | Urban delivery | Municipal utility | Construction | |
| Standard technology electric power [W] | 1 200 | 1 000 | 1 000 | 1 000 | 1 000 |
| LED main front headlights | – 50 | – 50 | – 50 | – 50 | – 50 |
To derive the mechanical power, an alternator technology dependent efficiency factor as shown in Table 6 shall be applied.
Table 6
Alternator efficiency factor
| Alternator (power conversion) technologiesGeneric efficiency values for specific technologies | Efficiency ηalt | ||||
|---|---|---|---|---|---|
| Long haul | Regional delivery | Urban delivery | Municipal utility | Construction | |
| Standard alternator | 0,7 | 0,7 | 0,7 | 0,7 | 0,7 |
F1If the technology used in the vehicle is not listed, the technology ‘ standard alternator ’ shall be considered in the simulation tool.
The final power demand is calculated by:
where:
Ptot Pel ηalt
Total power demand [W]
Electrical power demand [W]
Alternator efficiency [-]