Photovoltaic-powered vaccine refrigerator-freezer systems : field test results

Two systems developed by Solavolt International and one by Solar Power Corporation, both U.S. firms, were tested and are described with illustrated detail. The companies" experiences, unique and shared, in installing the systems are outlined. Performance data for those 22 field installations (of a total of 29) for which field test data were reported and for the overall operational reliability of the systems are summarized; considerable technical data are provided in graphs and tables. Test results show that the systems are very reliable and capable of maintaining proper vaccine storage temperatures in a variety of climates and environments. Also, user reaction to the Solar Power Corporation system has been monitored and found to be generally favorable, although Indonesia has reportedly encountered instrumentation difficulties and high costs. Twenty-one recommendations are provided regarding systems design, installation, documentation, and training. (Author abstract, modified)