As Fivedoor mentioned, don't hog the CHAdeMO charger if there are others available. Aside from that, there's no difference in the Bolt's charge rate at 150 vs 350kW chargers. But a 50kW charger will be slightly slower - see below.Volts, amps, kilowatts???? If I pull into an Electrify America station and there are a number of 150 and 350kw chargers available does it matter which one I use? And at an EVgo charger at 50kw will I still get maximum charging with my Bolt or should I stick to EA at higher kilowatts.
It's because:According to Eric Way, although we cannot benefit from the higher wattage, we can benefit from the higher amperage of the EA chargers. Makes no sense to me how/why this works, but I trust Eric.
(a) the Bolt's battery maxes out at about 400 Volts, and it's closer to 300 Volts when the battery is discharged
(b) chargers produce up to 500 Volts at a maximum number of amps, typically 100, 125 or 150 amps.
(c) Power in Watts = Volts X Amps
Although the charger can produce up to 500V, an empty Bolt can only accept 300V. So even though a 100A charger is rated at 50kW (500V x 100A = 50,000W), the Bolt can only accept 30kW (300V x 100A).
(note - these numbers are simplified to make the math easier to understand).
An 80kW charger would be 500V x 160A - since the charger can produce more amps then an empty Bolt would be able to accept 160A x 300V = 48,000 W (48kW).
This is why the charger's amp rating can be more important than its power rating.