What is the difference between Mono and Poly panels?

The difference between Monocrystalline (mono) and Polycrystalline (poly) solar panels is the construction of the silicon photovoltaic cells. A mono cell is made of single silicon crystal, while poly cells are made of multiple silicon crystal fragments that have been melted together. You can typically tell the difference between them by their colour. Mono cells look black and poly cells have a blue tint to them.

The single cell piece construction of mono panels makes them more efficient but also more expensive. In a caravan, marine, or 4WD application, where space for solar panels is at a premium, the bonus efficiency of mono panels tends to be worth the cost. Mono panels also have better heat tolerance than poly panels. Unless you are looking at purchasing used solar panels or residential grid panels, you will probably only have the option to purchase mono panels. Most new 12V and 24V solar panels are monocrystaline construction, including all the current models of Enerdrive solar panels.