In late 2018 or early 2019, Tesla will start rolling out the Supercharger Generation 3 hardware. There's been a lot of speculation about what charging power that will provide to current and future Tesla vehicles. Over in this thread, I speculated that the Model 3LR will peak at 180kW on SC Gen3 based on the 525A spec listed in Tesla's EPA submission for that car. I was reviewing this excellent Supercharging data and realized we may be able to predict (aka speculate) the peak charging rate for the current Model S/X 100 vehicles by scaling up the S/X75 battery charging profiles. The S/X75 (BTX5) charging curve appears to be amperage limited. You can see the increasing power profile from 5% to 50%, up to a peak of 100kW. This likely means this S/X75 battery is charging at a constant amperage of around 286A [100kW divided by ~350V at 50%]. The optimal S/X100 (BTX6) battery charging profile is flat from 10-60% at just under 120kW. This implies that it is power limited at 120kW, the max output of the current Supercharger Gen2. If we scaled up the 75kWh battery 286A peak to the 100kWh battery, it yields a peak charging amperage of of 386A [102.4/75.8 * 286A]. That infers the S/X100 might be able to charge at 127kW near 5% [386A*325V] and may peak at 135kW near 50% [386A * 350V] using a Supercharger Generation 3. That's 1.32C [135/102.4], the same c-rate as currently demonstrated with the S/X75 battery, which has the same chemistry and cooling technology but a different pack density.