Susuto

Also, what is the cost, life, size and efficiency of an "EV appropriate" solar panel?

Given the cost of electricity above: 36.02 ¢ / kWh ($8.6448/kWd), an average total solar output of 33% over Hawaii (50% daytime, and 33% cloud cover over the course of 2007), the nominal solar input value of 1 kW / m^2, and the current nominal photovoltaic efficiency of 18%, we can expect a total savings of 51.35 ¢ / day / m^2. If I knew specific cost, life, and efficiency of a given panel, I could tell you the feasibility of the panel as a cost saver.