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It is programmed to a 30A max by default. I have it on a 50A breaker and I am using 6/3 plug ground cable - three 6ga conductors plus ground; which is rated at 55A actually.
I was told last night by someone on the Leaf Forum that the way the JuiceBox Premium measures voltage is what leads to the higher kW readings. It apparently only samples the voltage when it is plugged in, and does not resample in real time. Since the Leaf can only take a maximum of 6.6kW, this possibly leads to charge totals that are 3%-4.5% too high. I will try to confirm this with Electric Motor Werks and if its a known error, then I will lower the kWh charge totals accordingly.
As it is, the charge I posted this morning was the second best, so far, at ~234Wh/mile. This is with the (still!) slightly high reading on the odometer (+0.5%) corrected (86.68 miles), but with the charge total at what the JuiceBox indicated (19.6kWh).
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