A properly-running factory or aftermarket alternator will pump out 14.5V- 14.8V, maybe even 15V.. so 16V for an alternator-less system isn't unrealistic at all. But running it in a dailydriver with a 16V-nominal alternator (as previously-mentioned, ~18V charging output) would be pushing things. From my experience when spec'ing various auto and non-auto electrical bits, things that are used in 12V applications have tech specs of "9V-16V source power" etc. I've yet to see anything 12V dc-intended that's rated up to 18V.
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