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First, ultra fast charging is really relevant only for intermediate stops on long-distance travel. There you have dedicated charging stations which are directly

by _ph_ 4y ago

First, ultra fast charging is really relevant only for intermediate stops on long-distance travel. There you have dedicated charging stations which are directly connected to high voltage lines which can deliver 10-100 MW. Modern charging stations already deliver up to 350kw, doubling that power wouldn't be sci-fi. But the peak charging rate is only one parameter and it isn't necessary to reach that in day to day usage. The biggest problem with current batteries is, that the maximum charge rate is good already, but only available while the battery is below 50% charge. So it isn't necessary to raise the maximum charge speed much, if this speed can be maintained for longer time. A battery which can take like 200-300kW till over 80% charge would be a winner and mostly "solve" recharging during trips.

kube-system 4y ago
Most batteries also degrade faster when charged at high rates. So at home, when you have the luxury of charging overnight, it’s better to charge slower.
- _ph_ 4y ago
  Right. And if you have batteries, which could take 700kW peak, but are only charged with 350kW peak, it is no longer "fast charging" in the sense of impact onto the battery. But the big future is anyway to have the car plugged into a modest outlet when parking during the day so they can take up any excess solar power available on the grid and possibly even partially power your home over night.
moonchrome 4y ago
> Modern charging stations already deliver up to 350kw Peak under optimal conditions ? Seeing how most stations fail to deliver on max charging claims I'd be sceptical we can realistically go so high without "lab like" conditions - available in 2 places in the world at 2 times so they can claim the number.
- _ph_ 4y ago
  Well, I was referring to the charging infrastructure and all current Tesla superchargers installed can deliver up to 250kW and Ionity here in Germany always installs 350kW chargers - that the battery of current cars cannot accept that for long or at all is exactly the topic why this new battery technology might be a big improvement.
Reason077 4y ago
> ”Modern charging stations already deliver up to 350kw, doubling that power wouldn't be sci-fi.” Not at all. In fact, MCS (Megawatt charging system) is already in development for charging heavy commercial vehicles. It’s designed to scale to charging rates as high as 3.75 MW! https://en.m.wikipedia.org/wiki/Megawatt_Charging_System https://en.m.wikipedia.org/wiki/Megawatt_Charging_System

by _ph_ 4y ago

kube-system 4y ago

Most batteries also degrade faster when charged at high rates. So at home, when you have the luxury of charging overnight, it’s better to charge slower.

_ph_ 4y ago
Right. And if you have batteries, which could take 700kW peak, but are only charged with 350kW peak, it is no longer "fast charging" in the sense of impact onto the battery. But the big future is anyway to have the car plugged into a modest outlet when parking during the day so they can take up any excess solar power available on the grid and possibly even partially power your home over night.

moonchrome 4y ago

> Modern charging stations already deliver up to 350kw Peak under optimal conditions ? Seeing how most stations fail to deliver on max charging claims I'd be sceptical we can realistically go so high without "lab like" conditions - available in 2 places in the world at 2 times so they can claim the number.

_ph_ 4y ago
Well, I was referring to the charging infrastructure and all current Tesla superchargers installed can deliver up to 250kW and Ionity here in Germany always installs 350kW chargers - that the battery of current cars cannot accept that for long or at all is exactly the topic why this new battery technology might be a big improvement.

Reason077 4y ago

> ”Modern charging stations already deliver up to 350kw, doubling that power wouldn't be sci-fi.” Not at all. In fact, MCS (Megawatt charging system) is already in development for charging heavy commercial vehicles. It’s designed to scale to charging rates as high as 3.75 MW! https://en.m.wikipedia.org/wiki/Megawatt_Charging_System https://en.m.wikipedia.org/wiki/Megawatt_Charging_System