AbstractIn the framework of the French R&D project MeGaPICS (Method towards Guarantee of Performances for Solar Cooling and Heating applications – funded by Agence Nationale de la Recherche), a selected number of indicators are defined. The final goal is to find the right indicators to guarantee the performance of solar cooling, heating and Domestic Hot Water (DHW) systems. The selection process consists in several steps, which are presented in this article. First part sets up the best practice of configuration schemes for both packaged small size installation and large-scale units. Second part deals with annual and seasonal performance indicators. Then they are applied to different existing installations (French and European units), using monitoring data. Finally, some boundaries are defined for those indicators.