Moreover, the positive electrodes were particularly affected by this degradation.The objective of this present work is the experimental observation of the evolution of the lead sulphate during deep and prolonged discharge of the positive electrodes. Irreversible sulphation has been identified as a major ageing effect in many investigations. It is, therefore, increasingly important to optimise this component and its management mode.In this study, post mortem analyses have been performed on batteries, which have been operating in PV installations. The analysis of these systems when running shows indeed that the weakest element is the battery, and extremely variable lengths of service life can be observed. In order for the number of individual photovoltaic installations, to increase rapidly, it is necessary for such systems to be reliable and cheaper. In PV and other RES applications where the battery might be left for long periods in a low state of charge the use of pulsed-current charging may increase the battery lifetime hence the adoption of this battery management approach needs to be considered as an option in PV applications. The purpose of this paper is to present the results of experiments on the recovering of " rechargeability " of highly sulphated lead-acid batteries by using high frequency pulsed-current charging. It has been suggested that the use of pulsed currents during the charging of this battery type will reduce the evolution of the lead sulphate on the electrodes or will even recover the " rechargeability " of those batteries that have lost it due to very extended storage in a low state of charge. The evolution of the lead sulphate occurs during deep and prolonged discharge of the electrodes. One of the several degradation mechanisms of lead-acid batteries is the irreversible sulphation of the positive and negative active mass.
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