Analysis of the Lead-Acid Accumulators Life-time in an Electrical PV System Based on the Faradaic Efficiency

In this work, we present smart tools to optimize the life-time of lead acid batteries in photovoltaic power systems. To achieve this purpose, we have developed and tested a photovoltaic electric system coupled to a battery, in which the system is equipped with an estimator of the state of charge (SoC) and another estimator of state of health (SoH) of the batteries. The system operation is improved by using a new MPPT control approach, a charge/discharge regulator, and a human-machine interface (HMI). The experimental results of the using system have shown improvements in the operation of the electrical circuit and the optimization of the battery life-time. Indeed, the MPPTcontrol ensure the system operation around the optimal condition, and improve their stability by taking in consideration the slightly variation of the battery voltage, the estimator of the faradic efficiency in real time led to the estimation of the SoC and the SoH and minimize the estimation error to a value of the order of 3%. The charge / discharge regulator allowed a better operation of the used accumulator given the evolution of these performances as a function of the charge / discharge cycle while taking into account their characteristics.particular attention has been assigned to compare the effect of depth of discharge (DoD) on battery performance (state of health, capacity, battery life-time...) during operation.The developed system is equipped with an HMI interface developed specifically for experimentation the electrical photovoltaic installation