The arcing you see is most likely the result of the filter caps on the power supply being charged by the propulsion bank. That's normal. You'll see the same arcing when connecting a DC-DC converter. In a fraction of a second (once the caps are charged), the arcing stops.
The arcing doesn't occur when the power supply is on since the caps are then being charged by the power supply itself.
If you want to be certain, put an ammeter in line with the output of the power supply. You might see a brief surge of current, but it will then instantly taper off to zero current (assuming there is no load on the power supply).
You have provided overcurrent protection at both the battery and power supply ends of this circuit, correct?
-Tom
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