National audienceNowdays, researchers aim to develop entirely autonomous sensors. Even if the use of batteries resolve a partof the energy problem by ensuring an important autonomy, it introduces many problems such as maintenance andenvironmental pollution. Solar harvesting energy, then constitutes a very attractive solution although the low quantity ofenergy obtained. Our goal is to provide an autonomous sensor based on a harvesting system of solar energy which can beused in various applications. In this article we present a study to perform this characterization.We look first at the solarpanel modeling through the characterization of photovoltaic solar modules. Next, we propose to model and quantify theincident solar energy amount. In thi...