At this point in the development of electrical systems there is no longer a need for multiple AC and DC power system to have to exist in a standard working environment being that DC to AC and AC to DC conversion between any voltage level, with conversion efficiencies of 95% or more being common, is trivial in cost compared to setting up dedicated power busses for multiple types and power capacity systems.
Especially so now that almost every modern piece of office equipment comes with a universal power input capability where anything between 90 and 250 VAC is an acceptable power source.
As far as standard solar power system voltages go I don't think there ever was one being DC power systems came in countless voltages over the years. 4 ,6, 8, 12,16, 18, 24, 32, 36, 42, 48, 54, 60, 72, 90, 100, 110, 120, 160, 180, 200, 220, 240, 250, 280, 300, 340, 660, 400, 440, 500, 550, 600, 750, 800 are all common DC voltages used in different environments around the world in countless applications.
Now relating to getting zapped well thats sort of where stupidity gets to learn the hard way being that most everywhere in the world the common utility voltages in the typical wall sockets are anywhere from 100 VAC to 240 VAC in homes and public places and often times can be up to and over 600 VAC in commercial and industrial environments.