Ohme partners with Octopus Power, for example, to smart charge electric cars at the optimum time during the day or night Ohme chief executive David Watson didn’t set out to start an electric vehicle charging company. The Cork man may have a degree in chemistry from University College Cork and a PhD in physical chemistry from Cambridge University, but he also spent several years with investment banks and a hedge fund, where he worked as a risk manager, in product structure and as a portfolio manager. When Watson did strike out on his own, it was with investment company Temporis…