PhaseWhite
Member
His detail of the Model 3 firmware below reveals that the battery is capable of about 480kW, which is something like 640hp. His later breakdown of the inverter shows that two of them should easily be able to handle that much power.
480Kw won't happen. The discharge rate is too high for battery health. Tesla has a warranty to worry about.
If we use the rough math from a P100D which has a battery with about 98Kwh usable capacity and can discharge around 580Kw completely maxed out then we get a discharge rate of 5.9C. I'm going to make an assumption that the 2170s can't hit that discharge rate, so let's plug in 5C * 76Kwh capacity, that would give us 380Kw. This also lines up with the previous quoted Max discharge from the BMS on the Model 3. That's around 500hp. If discharge rate went up to 5.5c we'd get to about 420Kw. I'm sure Tesla wants to observe the batteries in the wild in larger numbers before they make any changes that could increase warranty liability on the battery packs.
Source: Upgraded performance Metrics Summary
Hat tip @Krash