|Solar panels are available with mono-crystalline and poly-crystalline cells. These do not just look different: the mono-crystalline cells can be slightly more efficient but generally are also more expensive. Panels manufactured by the reputable companies are all high-quality and within specification, regardless of the cell type used.|
For the 4x4 and leisure market, a more important issue is the physical space you have available in which to mount (or store) the panel(s). An issue to bear in mind is that the Rand / Watt price is a good indicator of value for money rather than the basic cost of a panel.