# Commission Implementing Decision of 18 November 2014 on the approval of the battery charging Webasto solar roof as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance) (2014/806/EU), Division 2: The following input data for the calculation of CO2 savings potential are to be used:

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

mean solar irradiation PSR specified in Chapter 5.7.1 of the Technical Guidelines, i.e. 120 W/m2,
usage factor/shading effect UFIR specified in Chapter 5.4.2 of the Technical Guidelines, i.e. 0,51,
efficiency of the solar system ηSS specified in Chapter 5.1.3 of the Technical Guidelines, i.e. 0,76,
solar correction coefficient SCC specified in Table 1 and in Chapter 5.7.2 of the Technical Guidelines,
Table 1
The total storage capacity includes a mean usable storage capacity of the starter battery of 10 Ah (12 V). All values refer to a mean annual solar radiation of 120 W/m2, a shading share of 0,49 and a mean vehicle driving time of 1 hour per day at 750 W electric power requirement.
Total available storage capacity (12 V)/ PV peak power (Ah/Wp)
0,10
0,20
0,30
0,40
0,50
0,60
> 0,666
Solar correction coefficient (SCC)
0,481
0,656
0,784
0,873
0,934
0,977
1
consumption of effective power for petrol VPe-P and diesel-fuelled vehicles VPe-D specified in Table 2 and in Chapter 5.1.1 of the Technical Guidelines,
Table 2
Type of engine
Consumption of effective power VPe (l/kWh)
Petrol (VPe-P)
0,264
Diesel (VPe-D)
0,22
efficiency of the alternator ηΑ , specified in Chapter 5.1.2 of the Technical Guidelines, i.e. 0,67.
For the conversion factors CF the data in Table 3 is to be used:
Table 3
Type of fuel
Conversion factor (l/100 km) → (g CO2/km) (100 g/l)
Petrol (CFP)
23,3 (= 2 330 g CO2/l)
Diesel (CFD)
26,4 (= 2 640 g CO2/l)
For the mean annual mileage the data in Table 4 is to be used (km/year):
Table 4
Type of fuel
Mean annual mileage (km/year)
Petrol (MP)
12 700
Diesel (MD)
17 000
With these input data the CO2 savings for a petrol-fuelled vehicle are to be calculated by Formula (2).
The difference in mass between the baseline vehicle and the eco-innovation vehicle due to the installation of the solar roof and where relevant, the extra battery, is to be taken into account by applying the mass correction coefficient. The baseline vehicle is to be a vehicle variant that in all aspects is identical to the eco-innovation vehicle with the exception of the solar roof and, where applicable, without the additional battery and other appliances needed specifically for the conversion of the solar energy into electricity and its storage.
For a new version of a vehicle in which the solar roof panel is installed the baseline vehicle is to be specified as follows: it is the vehicle in which the solar roof panel is disconnected and the change in mass due to the installation of the solar roof is taken into account. In case the solar roof panel is made of glass a correction for the change in mass is to be introduced, i.e. an extra mass of 3,4 kg. In case the solar roof panel is made of low weight synthetic material no correction for the change in mass has to be made. On this change of mass the manufacturer must hand over verified documentation to the Type-Approval Authority.
Formula (2):
C CO 2 = P SR × UF IR × η SS × P P × SCC × V Pe − P η A × CF P M P × cosΦ − ΔCO 2mP
Where:
CCO 2 CO2 savings (g CO2/km);
PSR Mean solar irradiation (W/m2);
UFIR Usage factor/shading effect (-);
ηSS Efficiency of the solar system (-);
PP Peak power output (Wp);
SCC Solar correction coefficient (-);
VPe – P Consumption of effective power for petrol vehicles (l/kWh);
ηA Efficiency of the alternator (-);
CFP Conversion factor for petrol vehicles (100 g/l);
MP Mean annual mileage for petrol vehicles (km/year);
Φ Lengthwise inclination of the solar panel [o];
ΔCO2mP CO2 correction coefficient due to the change in mass following the installation of the solar roof and, where applicable, the additional battery and other appliances needed specifically for the conversion of the solar energy into electricity and its storage for petrol vehicles (g CO2/km).
The CO2 savings for diesel-fuelled vehicles are to be calculated by Formula (3).
The difference in mass between the baseline vehicle and the eco-innovation vehicle due to the installation of solar roof and, where relevant, the extra battery is to be taken into account by applying the mass correction coefficient. The baseline vehicle is to be a vehicle variant that in all aspects is identical to the eco-innovation vehicle with the exception of the solar roof and, where applicable, without the additional battery and other appliances needed specifically for the conversion of the solar energy into electricity and its storage.
For a new version of a vehicle in which the solar roof panel is installed the baseline vehicle is to be specified as follows: it is the vehicle in which the solar roof panel is disconnected, and the change in mass due to the installation of the solar roof is taken into account. In case the solar roof panel is made of glass a correction for the change in mass is to be introduced, i.e. an extra mass of 3,4 kg. In case the solar roof panel is made of low weight synthetic material no correction for the change in mass has to be made. On this change of mass the manufacturer must hand over verified documentation to the Type-Approval Authority.
Formula (3):
C CO 2 = P SR × UF IR × η SS × P P × SCC × V Pe − D η A × CF D M D × cosΦ − ΔCO 2mD
Where:
VPe – D Consumption of effective power for diesel vehicles (l/kWh);
CFD Conversion factor for diesel vehicles (100 g/l);
MD Mean annual mileage for diesel vehicles (km/year);
ΔCO2mD CO2 correction coefficient due to the change in mass following the installation of the solar roof and, where applicable, the additional battery and other appliances needed specifically for the conversion of the solar energy into electricity and its storage for diesel vehicles (g CO2/km).
The CO2 correction coefficient due to the change in mass is to be calculated by Formulas (4) and (5).
Formula (4):
ΔCO 2mP = 0,0277 × Δm for a petrol-fuelled vehicle
and
Formula (5):
ΔCO 2mD = 0,0383 × Δm for a diesel-fuelled vehicle
Where:
Δm Change in mass due to the installation of the solar roof and, where applicable, the additional battery and other appliances needed specifically for the conversion of the solar energy into electricity and its storage (e.g. 5 kg).

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Source: https://www.legislation.gov.uk/eudn/2014/806/annex/division/3/division/2 (the official version)
Page: https://openlegislation.uk/eu-decision-2014-806/annex/division-3/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.