In time-resolved experiments, usually only a small temporal period of a catalytic cycle is studied, i.e., this experiment cannot capture the ensemble of all productive (and unproductive) electron transfer events in the catalytic cycle. In the case of hydrogen-evolving RuPt photocatalysts, at least two electrons need to be accumulated on the catalyst to form a catalytically active species. Consequently, the pure study of processes after absorption of a single photon does not provide a sufficiently complete picture. To obtain insight into multi-electron or proton-electron coupled events, we present ESR spectroscopic results for the series of three potential photocatalysts, namely prbimRuPt, tbbpyRuPt, and fbpyRuPt, recorded under catalytic conditions, i.e., in the presence of the sacrificial electron donor triethylamine (TEA).