Performance of battery charge controllers: an interim test report [for solar power applications]

The evaluations and selected interim test results from eight different models of small (approximately 10 A) charge controllers are described. They are being subjected to a comprehensive test program including thorough electrical characterizations at selected temperatures, photovoltaic inputs, and load levels. After electrical characterizations, the charge controllers are divided into concurrent evaluation paths. One path consists of side-by-side operational system tests in which the charge controllers are installed in identical stand-alone PV power systems. The other path consists of continuous environmental and electrical cycling, in which the controllers are subjected to programmed electrical inputs, temperatures, and relative humidities. Recharacterizations of all controllers are performed on a periodic basis to detect changes in electrical performances In addition. selected custom tests are performed on identical models to determine response to transients, installation issues, and system capabilities. The data presented include measured electrical characteristics of the controllers, temperature effects, operational performance. and interface measurements at the array, battery, and load