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I have had a JuiceBox 40 Pro for sometime, connected to a 14-50 Nema plug backed by a 50Amp breaker. When I connected this charger using the adapter that came with my tesla UMC to my MS 90D...it only goes to 32 Amps...getting about 22mi/hr.

When I use the mobile UMC charger I get the full 40 amps 28mi/hr charge.

Any idea why the juicebox is not getting to 40 amps 10,000watts/hr?

On a side note, I would never buy this charger again, the UMC cable is so lightweight whereas the juicebox one is like a python.

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