Computerizer wrote:Doesn't the J1772 protocol have amperage negotiation between the car and the EVSE, so it would only supply what the car asks for?
You have it reversed. The car does *not* ask for a particular amount of amps. The EVSE tells the car how many amps it can supply and the car may not draw more than that number of amps. The car ultimately decides how much current to draw equal to or less than the maximum it is told. This "decision" is influenced by a number of factors, including (but not limited to) user adjustment (available in very few EVs), temperature or SOC limits, OBC (on-board charger) limits (e.g. 3.3kW), supply voltage, etc.