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This paper describes how to dimension the electric components of a 48V hybrid system considering real customer use. Furthermore, it provides information about savings in energy and CO2 emissions by a customer-tailored 48V hybrid. Based on measured customer profiles, the electric units such as the electric motor and the energy storage are dimensioned. Furthermore, the CO2 reduction potential in real customer use is determined compared to conventional vehicles. Finally, investigations are carried out to specify the topology design and preliminary considerations in order to hybridize a conventional vehicle with a 48V hybrid system. The emission model results from an empiric approach also taking into account the effects of engine dynamics on emissions. We analyzed transient engine emissions during representative customer driving profiles and created emission meta models. The investigation showed a significant difference in emissions when simulating realistic customer driving profiles using the created verified meta models compared to static approaches which are commonly used for vehicle simulation., {"references":["M. Nalbach, A. Körner, C. Hoff, \"Potential and Components of 48V\nLow Cost Hybrid Vehicles\", Intelligent Transport Systems, 10th\nSymposium Hybrid and Electric Vehicles, Braunschweig, 2013.","T. Dörsam, S. Kehl, A. Klinkig, A. Radon, O. Sirch, \"Die neue\nSpannungsebene 48V im Kraftfahrzeug\", in ATZelektronik, vol. 7, no.\n1, pp. 20-25, 2012.","R. Schmid, W. Hackmann, P. Birke, M. Schiemann, \"Design of a 48VBelt\ndriven Starter Generator-System drawing special system\nrequirements into account\", Intelligent Transport Systems, 10th\nSymposium Hybrid and Electric Vehicles, Braunschweig, 2013.","A.K. Jain, S. Mathapati, V.T. Ranganathan, V. Narayanan, \"Integrated\nStarter Generator for 42-V Powernet Using Induction Machine and\nDirect Torque Control Technique\", IEEE Transactions on Power\nElectronics, vol. 21, no. 3, pp. 701-710, 2006.","U.C. Blessing, J. Meissner, M. Schweiher, T. Hoffmeister, \"Scalable\nHybrid Dual-clutch Transmission\", in ATZ worldwide, vol. 116, no. 12,\npp. 4-9, 2014.","J. Mohrmann, \"Design of a 48V Micro Hybrid System\", master thesis,\nBraunschweig University of Technology, Institute of Automotive\nEngineering, 2014.","J. P. Müller-Kose, \"Representative Load Spectra for Vehicle\nGearboxes\", Shaker Verlag, Aachen, 2002."]}