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energy density Posted by Snowmobile [Email] (#686) [Profile/Gallery] (more from Snowmobile) on Fri, 6 Apr 2018 08:09:35 In Reply to: 450 volts DC?!, MI-Roger [Profile/Gallery] , Thu, 5 Apr 2018 15:13:12 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Cars need a fairly significant amount of energy to perform the way we are used to and gasoline has a fairly high energy density. This is of course the big challenge with an EV - storing and recharging all that energy efficiently and safely. I know you also have an engineering background, but you can imagine that for the average person, they might have no concept of this.
90kW at 45 volts would require 2000A current delivery, so you can see why 450V was chosen... most EV's are wired internally for a battery voltage of 100's of V as it is most efficient. Regardless, this capability is easily lethal so connectors need to make extremely good contact and also be safely designed. I've been shocked by 10000V before, but in a circuit that was low current capability, so the shock was trivial. More or less equivalent to a static electric shock... Normal car batteries are low voltage but high current capability, but the human body is high impedance at low voltages, so total delivered power is very low. EV car battery packs are both high voltage and current capability and therefore are much more dangerous!
I guess you'd need an 800A service to your house to install one of those chargers!!
->Posting last edited on Fri, 6 Apr 2018 08:11:00.
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