Performance analysis of a PV powered health clinic with single-stage dual priority regulator

The performance of a photovoltaic-powered health clinic system which uses two separate batteries, one to power a vaccine refrigerator and the other to power auxiliary loads is investigated. The two batteries were sized according to the demand of their loads. The power control system utilizes a single-stage dual-priority controller to charge the two separate batteries from a single photovoltaic array. The main refrigerator battery always has priority over the auxiliary battery, and therefore the use of auxiliary loads will never jeopardize the reliability of the critical load. This system provides power for auxiliary loads while utilizing the same number of photovoltaic modules as systems which power only a vaccine refrigerator. The performance of this system is evaluated using a data-acquisition system, and the experimental results are compared with their theoretical values