This paper is studied on the potential variation of electrode against environment conditions, soil resistivity and electrode resistance for cathodic protection. Base on this analysis, the following results for designing PV powered cathodic protection are obtained. (1) Select an anode and groundbed with low internal resistance. For the underground applications, a graphite anode surrounded by metallurgical coke breeze is appropriate. For underwater or wetter applications, conductive EPDM rubber may be more suitable than platinum. (2) If anode replacement is not a problem, consider the use of magnesium or zinc for the goundbed anode. (3) Use multiple anodes connected in parallel to minimize anode resistance (4) Install underground anodes so that stay moist as long as possible reduction is system performance over time and a possible increase in the cathodic protection current requirement. (author). refs., figs., tabs.