This 6V system produced enough energy to power other ancillaries such as windscreen wipers, turn signals and lights until the early 1960s, when radios, demisters, and other power-sapping features again stretched the system to its limit – leading to the introduction of a more powerful 12V system.
Still, such is the pace of development that a mere 35 years later, the 12V system was again coming under pressure. So, after a brief flirtation with 42V in the early 2000s, the power is once again being stepped up – this time to 48V.
Unlike earlier electrical systems the new dual (for now) 12/48V electrical system not only has to meet the demands of comfort and chassis systems, it is also expected to support the mission-critical functionality of current and future advanced driver assistance and autonomous driving systems.
While the mass rollout of Level 4 and 5 automated driving functionality is not expected before the mid-to-late 2020s, these systems will require more power alone than the 12V system can supply.
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