These are the typical (blue-colored) panels that strike your imagination anytime you hear about solar energy. Not only are they durable, but are also quite efficient. Generally, they offer a 4-decade lifespan which is remarkable for house improvement projects. In fact, such is the advantage with this lifespan, which you can have ample time to get your money back.
However, one disadvantage with these modules is their installation. Crystalline modules need a rather intricate racking system. Using the earlier figures if 6kW, such a system would cost approximately $16,500 since you require 25 panels each supplying 240W each. One 240W crystalline panels cost about $660.