The decarbonisation of the energy and transport sectors requires solutions that increase renewable energy utilisation while providing flexibility to power systems. Workplace charging is particularly well suited for this purpose because electric vehicles (EVs) are typically connected for longer than needed to complete charging. This paper investigates the charging behaviour and flexibility potential at two workplace charging sites located on a university research campus and a high school campus in Denmark. Using 21 months of field data from each site, we analysed the arrival and departure time, charged energy, charging duration, and post-charging idle time. These observations are used to quantify power-, energy-, and time-based flexibility and to assess the seasonal alignment between charging demand and on-site photovoltaic (PV) generation. The results show that both sites remain well below their grid connection limits: over the study period, the average power drawn while at least one EV is charging stays below 45% of capacity, and the average daily peak power reaches around 65% of the grid capacity. In addition, local PV generation meets approximately 55\% of charging demand during summer but less than 15% in winter. These findings provide practical guidance for workplace smart charging and its integration with local renewable energy systems.