This is quoting an older post, but it was quoted above.
bmscott wrote: ↑
Tue, 30 May 2017, 19:09
Well why can my 2010 iMiev charge from everything I can plug it into? It'll charge at 30-35 amps at CHAdeMO, 15 amps at the J1772 and 10 amps at home from the wall socket (via Ampfibian adapter).
Charging via the CHAdeMO connector (if fitted) is a DC charge. In essence, during a CHAdeMO fast charge, the charger is in the charging station, not in the car. CHAdeMO bypasses the car's charger. Essentially the battery terminals are exposed to two large pins of the CHAdeMO connector after some handshaking. The car's BMS tells the charger in the fast charger when to back off. So you get the grunt of the external charger (up to 50 kW or more) and the control of your own car's BMS; the best of both worlds. They're not all like that because the fast chargers are more expensive than the AC charging stations, which are a glorified AC power outlet.
When you charge via J1772, you are connecting AC mains to the input of the car's charger. Now the communications over the port isn't about how full the battery is, it's about how much power the AC source can safely provide. So you can run flat out (13-15 A, maybe there is a little variation in 2010 chargers, or the reported 15 A is reading a little high), or you can throttle the car's charger back to 10 A so as not to overload a domestic outlet. So you can never charge faster from J1772 than your internal charger allows. That's why some owners end up installing an extra one or two chargers in their cars. But if those owners do a lot of fast charging (from DC fast chargers like CHAdeMO), then the internal chargers (both the original and any extra internal chargers) aren't used.
Also note that the 30-35 amps at CHAdeMO are DC amps, at around 350 VDC, whereas the 15 or 10 amps for J1772 or Ampfibian are AC amps, at around 240 VAC. So the DC amps count for about 50% more power than the AC amps. For example, on an iMiEV, a 30 A CHAdeMO charge is about 3x faster than a 15 A AC charge (30 x 350 = 10.5 kW, verses 15 x 240 = 3.6 kW).
Learning how to patch and repair PIP-4048 inverter-chargers and Elcon chargers.