Your printer problem intrigued me so I measured the current draw of my HP. At power up, after being off for 12 hours, the peak current was slightly higher than 5 amps. This was the steady state current when printing. When not printing it dropped to about an amp. This is a rather large home use printer. I would not expect your printer to have a significanlty higher current draw. Compare this with an inrush current of 50 amps for my amplifier, with an operting current at my listening levels of around 5 amps. Similarly, a power on current draw of 25 amps for a vacuum cleaner and then an operating current of 10 amps. The vacuum cleaner and the amplifier do cause a very short momentary dimming of the lights at power up but the printer does not. This may put things in perspective. Hope it helps. Let us know what you find and how you solve your current situation.