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| The electric battery |
Explanation No. 8 in this lesson,same compressor that's used in the Model 3 as well and it can be used in R134a systems or the R1234yf refrigerant systems it has a two-wire electrical connection DC input it has its own built-in inverter where it inverts it into ac and drives a little three-phase high voltage motor in here to run the air conditioning compressor at variable speeds it has a low voltage logic connection here for can serial data communication to the controller and this connection this dc connection to run an ac motor is picked up off this bottom blue connection right here on the high power distribution module.
Power supply to DC converter:
so we'll plug that in so there's our air conditioning compressor our next uh component that connects to the high voltage distribution block here is the dc to dc converter this is the DC to DC converter for this vehicle we have two wire high voltage 400 volt or so power being fed to the DC to DC converter, it has an input from the manufacturer Delta Electronics says maximum input is 430 volts at 15 amps and then it says the maximum output which is incredible is 9 to 16 volts 2500 watts maximum well that gives us at 14 volts output on this red terminal right here remember we have DC voltage coming in high voltage 400 volt we the DC to DC converter takes high voltage DC and converts it down to low voltage DC but it steps up the current with the same ratio that it stepped down the voltage and so we can have 14 volts with what did I calculate a maximum of 178 amps to reach that 2500 watt maximum output 178 amps that's very impressive. most vehicles don't even non-hybrid and non-electric vehicles don't have an alternator that puts out that much current so that's pretty impressive this cable right here goes to the underhood junction block for your fuse block and your 12-volt battery. This is what charges the 12 volt battery as you see right here in this photo underneath the hood this 14 volt output this little cable right here off this terminal right here this would be the equivalent of battery negative cable so it would go to the chassis of the vehicle that I have on the hoist here and then battery negative would be connected to that same vehicle chassis so this is the dc to DC high voltage DC to low voltage DC converter as you can see it's liquid-cooled um this gets pretty hot uh at maximum output or close to maximum output needs to be cooled and so this electrical connector right here this two wire one is going to plug into our distribution block picking up power off of a 30 amp fuse where the air conditioning compressor was the big 40 amp fuse.
Battery Heater Wattage:
so we'll plug that in that is our dc to dc converter output now our next output off of our high voltage distribution block here is the battery heater so this is the battery coolant heater we have an inlet and an outlet I'm not sure which one is the inlet which one is the outlet we have a high voltage two wire connection here for dc power and then we have a two wire electrical connection I assume it is for uh communication uh or control of the battery heater this battery heater I don't see a rating for its wattage the previous one I accidentally bought the older version and I think it said 6300 watts or 6.3 kilowatts if you guys know what the battery heater wattage usage is on a cold day when you start up the vehicle can you see how much power the battery heater is using let me know in the comments down below but this battery heater is the one that uses that circuit board inside of the junction block so it has a 30 amp fuse but then it goes through those transistors on that circuit board for control whether it be just on-off control or variable control I suspect it's variable but this is going to bolt up right here on top of our DC to DC converter that's where it sits in the car is right up right above the dc to dc converter and then the electrical connector for it goes in this too many pieces here in the second electrical connection down plug that in and then our very last connection is for the cabin heater the heater that heats the air for inside the passenger compartment this car does not have any type of liquid heater core does not use heat from the battery or the electric motors to , We move to the explanation number 9 of this lesson.