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If anyone was for some reason thinking of actually doing this (no, you aren't), keep in mind this might violate electrical codes in the US.

For a 15 Amp circuit (not a 20A kitchen plug etc), the NEC limits a continuous load to 1440W.
15A * 120V * 80% = 1,440W
This isn't likely to be a practical issue, so whatever.
NEC/CEC (as applied in respective jurisdictions) not an issue here since the devices are being used as rated and load isn't considered continuous.

Otherwise, it seems like they accounted for a worst-case max draw on the whole stack of chargers leaving 200w of headroom per standard 15A breaker (typically serves a few general use outlets).
 
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I am going to daisy chain 6 of these bad boys to charge my flux capacitor!

if I cause a city wide blackout, sorry in advance.
 
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