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the power usage should be stated on the label of any electronic device. Usualy on the metalic sticker on the device or plug if the plug is a transformer.
Good point. I also found it on marinedepot.com. A MJ900 pulls 8.5 watts of power.
8.5W/120V = .07 Amps
Just wanted to make sure that with dual 175W lights, 80 NO florescence, 5 pumps (return, 2 PH, PS, fuge), 2 heaters, etc. that I wasn't going to push the limits of my circuit.