I dont know the different types but got my gear from this place, x2 140w panels (In Black) and a 30a controller for a tad over £300 came with the cable and connections. Dont know what the warranty or lifespan is like with any other panels but these do have a good 10yr produhttp://www.solarenergyalliance.com/Solar%20PV%20small%20panels%20and%20accessories.htmlct warranty, 12 yr performance warranty.
Crystalline and Amorphous Solar Panels
Their are two main types of solar panel: crystalline and amorphous. In both cases the key ingredient is silicon. Amorphous panels are typically cheaper to manufacture (and purchase), less susceptible to breakage, and use less silicon, however their power output is typically lower than crystalline panels meaning that an amorphous solar installation would take up a larger area than a similarly power-rated crystalline installation.
Amorphous solar panels deteriorate faster than crystalline solar panels and so their power output will fall more quickly during the years of use, but they cope better with partial solar panel shading.
amorphous panels used to be the choice for suitcase type panels because of their superior strength
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