Surprisingly, the degree of acceptance of photovoltaic solar water pumping systems by the users is very low. There are several factors which have inhibited the wide-spread implementation of these systems. These include the high initial cost, lack of awareness and technical expertise, lack of suffucient knowledge on the daily output of these systems (predictability) and a history of failures [1]. For example, several solar water pumping systems were installed in various areas throughout Fiji. However, most of these systems have experienced problems, mainly because these were not properly sized. The output in terms of the daily volume of water pumped was below the expectation of the users [2].