It is very important to note that shading even one cell of a module will reduce the output of the entire module. The only exception to his is the Uni-Solar modules which have built in diodes between the cells to reduce this effect, but it is better to mount the solar modules so shading is avoided. It is a common misconception that heat is required for PV modules to produce electricity. High temperatures actually increase resistance and reduce the voltage within the silicon cells. Warmer climates require PV modules with a higher maximum voltage than those used in cold climates.
Cold temperatures decrease resistance and increase voltage.
Modules with a low voltage rating are ideal in colder climates such as Canada because more of the power produced is available as charging current, rather than voltage. Power Rating PV modules from the main manufacturers are similar quality and should provide years of reliable power. Most people base their buying decision on the cost of the module and its power output. However, power ratings for PV modules can be misleading and this can lead to disappointing performance. Each of our products have watts, amps and voltage listed in the product tables.