Crystalline photovoltaic solar panels can be of two different types:

Monocrystalline silicon.

Photovoltaic modules are based on silicon crystals. They offer strong power and high efficiency. They make it possible to obtain maximum power on a reduced surface. They are also extremely resistant (do not fear cold, rain or heat). Moreover, their cost is relatively high and their efficiency is reduced under low light.

Polycrystalline silicon.

Photovoltaic panels are composed of silicon polycrystals. Their manufacture is less expensive than for monocrystalline. Less expensive, however, they have a lower yield. They are the market favorites because they offer the best advantages in terms of quality/price.