The photovoltaic (PV) system must have direct access to the sun’s rays most of the day. Shading the system can significantly reduce the amount of energy produced. Climate is not a problem as solar PV systems are relatively resistant to harsh weather conditions. In fact, some PV modules perform better on cooler days. Most PV modules are angled to catch as much sunlight as possible, so any snow that accumulates on them usually melts quickly. There is enough sunlight in Poland for solar installations to be useful and effective.