I'm not sure that I've found the correct device as this is the only Go Power portable power station that I could find online. Hopefully this is the one, if not please find the model number of the power station so that the correct one can be found.
Looking at the specifications for the model linked above it states Wall Charging = 12-30V, 8A, 120W max.
To satisfy the 120W max rating criteria, you would need to use a 15V 8A adapter (supplier example only) as a higher voltage output adapter e.g. 20V or 30V, with the same current rating i.e. 8A, would exceed the power (W) rating specified (Ohm's law power calculation W=V x A i.e. 120 = 15 x 8)
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