2020 Kona Ev. Set up timed charging to the morning with timed pre conditioning. Plugged it in in the evening so that it can use the charger in the morning. Turns out it leaves the car on a higher alert.
Is the 12v still usable? I tried jump starting with a pocket booster. The car turned on for 8 sec and it died again like 8 times. Is it completely dead? What to do?
You’ll have to put a charger on it. It takes about 2000 amps to jump it.
Many ICE car batteries are rated at around 600CCA. This is how many amps they can produce continuously for 30 seconds at 0F/-17C. They can spike above this but 2000A is something they can only produce for a couple of seconds at most.
The 12V battery in an EV doesn’t need anywhere near this amount of current. It needs enough power to run the car’s basic electronics and to be able to open the high voltage contactor. Once that’s open, there is a DC-to-DC converter that takes over and turns the HV battery voltage into 12v for the car to use.
So no, you don’t need 2000A to jump-start an EV. Most lower-powered lithium jump starter packs are perfectly fine.