3 ms·
The relevant factor for 800v vs 400v isn't the current in the battery, but rather the current in the DCFC cable hooking to the car. We can't very effectively in
by chipsa 5y ago
The relevant factor for 800v vs 400v isn't the current in the battery, but rather the current in the DCFC cable hooking to the car. We can't very effectively increase the amount of current, because the cable gets too heavy. So it increase charging speeds, we need to increase the power by increasing the voltage.
- hulitu 5y agoThe battery pack has a working voltage. If your charger has a different voltage you need to convert that voltage to battery pack levels. So going from 400 V to 800 V says little about efficiency.
- chipsa 5y agoThe 400V vs 800V is nominal voltage for both the output from the charger and the battery pack. There's some trickery I've heard about with switching half the pack from parallel with the other half to series while charging. But generally the voltage across the output from the pack will be equal to the voltage coming from the charger.