  This paper deals with the problem of identification of photovoltaic arrays'
maximum power extraction point---information that is encrypted in the
current-voltage characteristic equation. We propose a new parameterisation of
the classical five parameter model of this function that, combined with the
recently introduced identification technique of dynamic regressor extension and
mixing, ensures a fast and accurate estimation of all unknown parameters. A
concavity property of the current-voltage characteristic equation is then
exploited to directly identify the desired voltage operating point. Realistic
numerical examples via computer simulations are presented to assess the
performance of the proposed approach.

Systems and Control