Theoretically the 100A stations could pump out 50 kW, but in reality no EV can charge that fast on a 100A unit.

It's the reason that DCFC should be listed in amps, not kW. The actual kW power is a function of the amps, which is fixed, and the current battery voltage, which is variable but never tops out any higher that 400 volts. So simple math shows that 100A x 400V = 40 kW, which is the highest realistic power for an 100A station. Of course taper will mitigate that too.

In general the battery is in the 360V ballpark in the heart of the charging cycle. That's the voltage that generally will maximize your power. You can see it in the instantaneous charge rates:

360V * 100A = 36 kW

360V * 125A = 45 kW

360V * 150A = 54 kW

The Bolt accept max power at 150A. So that's why when plugged into a 175 kW (350A) DCFC, it tops out in that 54-56 kW ballpark as 360V or so is the highest voltage that allows for maximum current before tapering.

Just remember that the nominal voltage of CCS1 is 500V and 500V batteries are not in any production EV. So the 175 kW stations are 350A @ 500V while the 350 kW stations are 350A @ 1000V. Using 360V or so as your multiplier gives better numbers. BTW a 125A DCFC should actually be a 62.5 kW station using the standard nomenclature. This is what causes the confusion between the 100A and 150A stations, which are both labeled at 50 kW.

ga2500ev