This study explores hydrogen production through the integration of photovoltaic (PV) technology and electrolysers across diverse European locations. Employing an optimization algorithm, the optimal PV field power can be determined to minimize energy wastage and maximize hydrogen production. The model accounts for PV energy losses due to deficiency and excess in electrolyser operation. The results highlight location-dependent PV power ratio, ranging from 1.2 to 1.9 times the electrolyser power. Incorporating PEM stack degradation, estimated at 0.5% per 1000 operating hours, our model calculates a hydrogen mass-to-solar-energy ratio, varying from nearly 17 g/kWh˙PV for large-scale systems in optimal locations to under 13 g/kWh˙PV for small-scale electrolysers in challenging environments. In conclusion, annual hydrogen production averages approximately 40 tonnes per megawatt of electrolyser capacity when coupled with a optimal sized PV powerplant in south Spain.