ABSTRAK
Charging system plays important role in solar storage system in order to gemaximum efficiency in extracting energy from the solar radiation. Microcontroller is
used to maintain certain condition of power production which is to maximize poweproduction from the solar panel as well as to convert low voltage to higher on cloudcondition, otherwise to maintain high voltage of solar panel into suitable voltageAtmega 32 based fuzzy technique has been designed and experimentally carried out
to increase charging efficiency of solar panel system in this study. Fuzzy techniqueenables to read multiple signals and further producing single output. Three scenariosof charging based fuzzy have been performed experimentally to get the besperformance from some possibly scenarios. They were linear with temperaturcompensation and 2-step with and without temperature compensation. Scenario ofcharging without fuzzy also carried out to get comparison with charging based onfuzzy. The results were battery temperature, voltage battery, voltage charging, currentand time of charging. Further charging efficiency was calculated to know the
charging performance beyond all scenarios. Charging based fuzzy of linear withtemperature compensation recorded the lowest temperature rise of the battery whicwas only 30.4 C. Charging efficiency based fuzzy attained up to 98.08% for the lineawith temperature compensation scenario whereas efficiency of charging withoutfuzzy attained 86.54%. Linear with temperature compensation scenario waconcluded as the best charging design based fuzzy on this study. It proved to be able
to control battery temperature and attained high charging efficiency. It was able tokeep battery lifecycle by protecting battery from overcharging and high temperaturerising.
Keyword: Charging design, solar system, efficiency, atmega 32, fuzzy technique