Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions

•A methodology for the outdoor testing of hybrid PVT collectors is presented.•Glazed and unglazed collectors featuring c-Si and thin-film PV modules are compared.•Steady state and dynamic thermal performance of the PVT collectors are characterised.•Thermal and electrical energy yields over diurnal operating periods are assessed.•Experimental performance is compared to model simulations under intermittent cloud conditions.