Kemnitz Louis Date and Place of Birth

Louis Kemnitz was married to Mary Laurenson 1879 and lived in Dunedin NZ. He died 1925 Dunedin, I would estimate his birth about 1860 but have few details as to where? He had a younger brother that was born in Melbourne AUST. Louis was a chairman for the NZ Germany Society in Dunedin which makes me think that his parents and him came out from Germany, firstly to Melbourne where there was other relations and then on to NZ.

Any help would be greatfully appreciated.