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The energy used to charge rechargeable batteries usually comes from a battery charger using AC mains electricity, although some are equipped to use a vehicle's 12-volt DC power outlet. The voltage of the source must be higher than that of the battery to force current to flow into it, but not too much higher or the battery may be damaged.
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The actual voltage, matching the car battery's voltage, will be approximately 12.5 volts when dormant (less in cold conditions), approximately 14.5 volts when the engine and the alternator/generator are operating (more when cold), and may briefly drop as low as 5–6 volts during engine start due to the high temporary battery current usage. [12]
A 48 V system can provide more power, improve energy recuperation, [7] and allow up to an 85% decrease in cable mass. [10]12-volt systems can provide only 3.5 kilowatts, while a 48 V power could achieve 15 to 20 kW or even 50 kW. 48 volts is below the level that is considered safe in dry conditions without special protective measures. [11]
These are motor/generators rather than motor–generators, single units which can act as either a motor or a generator. They make the cars more fuel-efficient by harvesting energy from regenerative braking and from the turbocharger, and can also be used to provide up to 160 BHP extra to the wheels to aid acceleration and overtaking, or to spin ...
The battery management system on the electric vehicle negotiates the maximum current with the electric vehicle supply equipment via dedicated pins in the Type 3C connector. The Type 3 (3A/3C) connectors are generally oval in shape, with circular top and bottom edges and flat right and left edges; the maximum power carried is 24 kW.
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