Originally posted by zakspeed
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Täytyi vähän pöyhäistä asiaa.
Järjettömiä eroja eri autoissa. Renu puhaltelee puolet energiasta lämmöksi.
A significant amount of energy is transferred while charging an EV, the efficiency should therefore be one of the main concerns when designing a charger. Other concerns are small volume, light weight, reliability, low electromagnetic interference and low current and voltage ripples. Apart from the automotive constraints it has to be made of low cost components to keep the total cost of the EV down.
Most EVs on the market are able to charge at a range of 6-16 A and individual models like Renault Zoe has a range of 6-63 A. A large range results in a reduction in the efficiency. A power converter with an efficiency of 95 % have a decrease in efficiency of 10 % when operating at half the nominal power, which EVs often do [5, 6]. This paper shows that the aforementioned effect is present in the tested EVs and that the loss is closely related to the charge range. A typical reason for a high loss in a converter is when well-dimensioned components are discarded for cheaper models in order to keep the retail price down. Under-dimensioned components cause higher heat dissipation that makes cooling necessary, which is an additional power consumption. The OEM can reduce cost of the components without consequences as it is impossible for the consumer to compare the efficiency of the vehicle with other models on the market. The manufacturer specifies the battery capacity and a drivable range that can be achieved on a full battery, but the amount of electrical energy that is needed to fully charge the battery is not specified.
edit. tesla model 3
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