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Performance of power electronic converters has become a major concern in the present day. Converters should be designed with the objective of gaining a high efficiency, increased reliability and less complexity. This paper presents the reliability analysis of three converters. Reliability of two-stage Interleaved boost converter, two-stage and single-stage PFC converter is measured. It is shown that number of components in a device effects the reliability of a system.

This paper deals with the implementation of maximum power point tracker (MPPT) for solar panel along with safe battery charging algorithm for lead acid battery. This is a stand-alone system with incremental conductance MPPT algorithm and can be used for stand-alone application. Single ended primary inductor converter (SEPIC) is used to match the impedance of solar panel and battery to deliver maximum power. Voltage and current from the solar panel is sensed and duty cycle of gating signal is varied accordingly by the algorithm to attain maximum power transfer.Keywords: MPPT, Incremental Conductance, Battery Changing Algorithm, SEPIC. I. INTRODUCTIONIn the recent world the use of non-renewable source of energy has drastically increased. These non-renewable sources like gas, oil, coal, nuclear energy etc. has results in the pollution resulting global warming, depletion of Ozone layer etc. now it is time until it's too late to reduce the use of non-renewable source of energy and focus on renewable sources which are clean form of energy. To meet the raising power demand, photovoltaic technology which is strongly developed can be used, were a part of sun light is transformed into electricity. This paper is basically based on two principle topics, the MPPT algorithm using a SPEIC converter and safe charging of lead-acid battery algorithm. Thus this paper shows the work on MPPT algorithm for photovoltaic stand-alone system aiming to improve the power transfer from solar panel. This MPPT algorithm is used in one of the charging stages of safe charging algorithm of lead acid battery. One of the simple MPPT algorithms is perturbation and observation method but this algorithm isn't effective for rapidly changing environmental conditions. Looking at the drawbacks of P&O algorithm incremental conductance algorithm was developed. It is based on the fact that increasing panel conductance is equal to the instantaneous panel conductance at maximum power point. Different stages in the safe battery charging of lead acid battery are also explained.