BYD 1000kW Chargers

[GranTurismoEra]

But I suppose he'll only be hogging them for a few minutes.

In the UK there'll be cursing matches for those 5 minutes.

 

[Gomev]

Has anyone asked whether we actually want charging that fast ? This would actually slow down my stops as it would be so quick I'd have to wait with the car while it's charging and then move and park up to go and do the other stuff I stopped for.

 

[Bam Bam]

Has anyone asked whether we actually want charging that fast ? This would actually slow down my stops as it would be so quick I'd have to wait with the car while it's charging and then move and park up to go and do the other stuff I stopped for.

Dave B. has asked exactly that question...

 

[mg4mc]

Check the cable thickness, can that really deliver 1000kWs?

Depends on the voltage, I've not seen any mention of what voltage their mega chargers are running at.

 

[Bam Bam]

Depends on the voltage, I've not seen any mention of what voltage their mega chargers are running at.

1,000-volt architecture apparently.

 

[decrep]

1,000-volt architecture apparently.

That's still 1,000 amps, a lot of current through that cable.

Magnetic fields, pacemakers?

 

[mg4mc]

They have secret room temperature superconductors in there

 

[Coulomb]

The cable in the video looked like it was just thick enough for one conductor, and of course you need two very heavy conductors, plus the cooling. Ok, with cooling, the conductors can be a little thinner, but I'm sceptical.

 

[decrep]

I suspect a mock up.

 

[securespark]

I have come across all sorts as a spark. One of the situations was a shower on a 40A breaker fed with 2.5 mm² cable. I can't remember the shower size, but I had calculated the current at in excess of 45A. 2.5 is rated at 27A maximum.

But this shower had run for several years before conking out.

So could there be an element of overload built in to the cable calcs?

Edit.

Sorry, just realised...we're talking about DC here, aren't we?

 

[decrep]

Not sure there's much difference in a non inductive load, especially if you talk in RMS values.

 

[Coulomb]

Not sure there's much difference in a non inductive load, especially if you talk in RMS values.

That's what RMS is all about: making AC the same as DC from the point of view of heating etc.

There is a slight skin effect even at 50 Hz. But it's mostly about getting the heat out.

So could there be an element of overload built in to the cable calcs?

The calculations are based on continuous loads. Fuses, breakers, and the cables they protect can take considerable overloads for considerable periods of time, like the time it takes to have a shower. In the end, someone must have taken a longer shower than usual, or not enough time between showers, so that the hot cables could not recover.

I'm trying to work in something about the virtues of taking lightning showers, but it isn't working for me.

 

[securespark]

Sorry.
When I said this:

So could there be an element of overload built in to the cable calcs?

I meant it in relation to BYD's calcs, not the shower circuit.