The power poles are amp-rated but I do not find much difference in any size smaller than 41 amps (40, 30, 20 all look the same) possibly the crimp sleeve is smaller on the smaller poles (Think that is the difference)
Now: ANY connector No matter the make, type, style, size, will add some resistance... Power poles are no exception.. but how much is the question (Very little) So I'd not think it will be significant.
one thing though they are "Self Cleaning" every time you plug in or unplug NOT under load they clean themselves ... IF you plan to plug in and "Do not disturb" you may find they perform less and less well.. If so, Remove power (Switch off) and unplug/replug a couple dozen times and see if it improves.
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or use De-Ox-It
I would use at least the 40 amp size Seems to work with 10 or 8 ga Speaker wire (What I use for cable)
