# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 3.3: Electric system

Extent: E+W+S+N.I.

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
If 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:
P tot = P el η alt where:
Ptot Total power demand [W]
Pel Electrical power demand [W]
ηalt Alternator efficiency [-]

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/IX/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-IX/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.