Chris TX
Active Member
I understand what techmaven said. With 120kW charging for example, at 800V you have 150A at the battery. Model S has 333A max. Assuming you have 800V 85kWh pack, at 120kW charging, C rate for this pack is the same as C rate for 400V 85kWh pack. However, 800V pack takes half the amps of 400V pack.
Now these two packs have the same C rates, so same charging taper curve. You don't get faster charging battery pack by making more module serial than parallel.
Thus, to obtain faster charging speed, for example 2x times, you need to bump the battery to 170kWh. I think that's why it weighs 2t - the battery would be over 1t.
Next question is slow performance, if 170kWh battery is assumed.
An 800VDC battery can still be ~80kWh, like we're figuring this Porsche will have. Getting it charged up to ~80% in 15 minutes could take need to have ~350A or more pumped to it. That's why I'm saying the new IEC standard for 1000VDC @ 400A seems more plausible. 800V@250A isn't going to cut it for their goals.