The JuiceBox is capable of up to 15kW charging, so that would be the way to go if you drive the Mercedes B Class Electric.
By the way, once we get our JuiceBox, we will have lower consumption, because 240V charging takes less time, and since the charger's losses are constant over time.
120V x 12A = ~1.4kW
240V x 28A = ~6.6kW
That is nearly 5X faster charging, so the losses are about 80% less.
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