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Could someone please tell me verify the soundness of my logic?

I'm trying to calculate the maximum number of 12V 1 AMP power adapters I can plug into one 15 amp circuit? I'd like to power 16 CCTV cameras, a DVR, and my modem, all which have their own adapters drawing 12 volts, 1 amp per device. I'd like to plug these all into one location, but am concerned about whether this is safe.

From what I understand, I should be doing all this in watts. So for starters, I'm assuming 110 volts at the outlet for the voltage drop from the breaker to the outlet. That means...a maximum of (15 amps) * (110 volts) = 1650 watts. Then deduct 20% of that for it being a continuous (24/7) load, giving me 1320 as the max watts I should use.

From there, each device adapter is (12 volts) * (1 amp) = 12 watts. 12 watts * 18 (16 cams + 1 modem + 1 DVR) = 216 watts, which is WAYYY under the 1320 watts the circuit could support on a continuous load?

Everything I've found online says my math checks out, but I can't get over the fact that I have 18 devices at 1 amp each. 18 amps > 15 amp circuit. :(

Can somebody please tell me if what I'm doing is safe? Does my math check out? Is there something I'm missing?

Thanks!

Oh, and just in case it's of any comfort, everything I'm working with is UL listed. None of that cheap "Well it says it's this, but..." surprise garbage from overseas. :)

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# How many of these adapters can I safely install in one outlet?

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