In recent years there has been a significant increasing of distributed generation integration to the electrical mains, where it is possible to highlight photovoltaic systems. One of the key points in the implementation of these systems is the elaboration and tuning of the maximum power tracking (MPPT) algorithm. The present paper evaluates the impacts of the MPPT algorithm tuning, such as the choice of the increment/decrement step and the update time of the tracking variables, over the efficiency of the energy extraction process. For this, a P&O (disturb and observe) algorithm using the photovoltaic panels current as a control variable is implemented in a 5.1(kW) system. Resumo: Nos últimos anos houve um significativo aumento na integração dos sistemas de geração distribuída a rede elétrica, onde pode-se destacar os sistemas fotovoltaicos. Um dos pontos primordiais na implementação destes sistemas é a elaboração e sintonia do algoritmo de rastreamento de máxima potência (MPPT). O presente trabalho avalia os impactos da sintonia do algoritmo MPPT, como a escolha do passo e do tempo de atualização das variáveis de rastreamento, sobre a eficiência do processo de extração de energia. Para isso, um algoritmo P&O (perturbe e observe) utilizando a corrente como variável de controle é implementado em um sistema de 5,1(kW).
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