<P> In 2015, GCL System Integration Technology Company made an increase of 500%, topping 2.5 - 2.7 GW, which puts it at seventh rank, overtaking Yingli Green, compared to 0.5 GW in 2014 . Their solar PV module production appears to have reached a 3.7 GW capacity at the end of 2015 . </P> <P> Solar modules, as the final products to be installed to generate electricity, are regarded as the major components to be selected by customers willing to choose solar PV energy . Solar module manufacturers must be sure that their products can be sustainable for application periods of more than 25 years . As a result, major solar module producers have their products tested by publicly recognized testing organizations and guarantee their durable efficiency rate for a certain number of years . The solar PV market has been growing for the past few years . According to solar PV research company PVinsights, worldwide shipments of solar modules in 2011 was around 25 GW, and the shipment year - over-year growth was around 40% . The top five solar module producers in 2011 were: Suntech, First Solar, Yingli, Trina, and Canadian . The top five solar module companies possessed 51.3% market share of solar modules, according to PVinsights' market intelligence report . </P> <Table> <Tr> <Th> Ranking 2011 </Th> <Th> Market share </Th> <Th> Solar module company </Th> <Th> Ranking </Th> <Th> Market share </Th> <Th> Country </Th> </Tr> <Tr> <Td> </Td> <Td> 5.8% </Td> <Td> Suntech </Td> <Td> </Td> <Td> 8.1% </Td> <Td> China </Td> </Tr> <Tr> <Td> </Td> <Td> 5.7% </Td> <Td> First Solar </Td> <Td> </Td> <Td> 7.9% </Td> <Td> USA </Td> </Tr> <Tr> <Td> </Td> <Td> 4.8% </Td> <Td> Yingli Solar </Td> <Td> </Td> <Td> 6.4% </Td> <Td> China </Td> </Tr> <Tr> <Td> </Td> <Td> 4.3% </Td> <Td> Trina Solar </Td> <Td> 5 </Td> <Td> 6.1% </Td> <Td> China </Td> </Tr> <Tr> <Td> 5 </Td> <Td> 4.0% </Td> <Td> Sungen Solar </Td> <Td> 6 </Td> <Td> 5.3% </Td> <Td> China </Td> </Tr> <Tr> <Td> 6 </Td> <Td> 2.8% </Td> <Td> Sharp </Td> <Td> </Td> <Td> </Td> <Td> Japan </Td> </Tr> <Tr> <Td> 7 </Td> <Td> 2.8% </Td> <Td> Sunpower </Td> <Td> 8 </Td> <Td> </Td> <Td> USA </Td> </Tr> <Tr> <Td> 8 </Td> <Td> 2.7% </Td> <Td> Hanwha Solarone </Td> <Td> 7 </Td> <Td> </Td> <Td> South Korea </Td> </Tr> <Tr> <Td> 9 </Td> <Td> 2.3% </Td> <Td> Jinko </Td> <Td>--</Td> <Td> </Td> <Td> China </Td> </Tr> <Tr> <Td> 10 </Td> <Td> 1.9% </Td> <Td> REC </Td> <Td> 10 </Td> <Td> </Td> <Td> Norway </Td> </Tr> <Tr> <Td_colspan="6"> Sources: </Td> </Tr> </Table> <Tr> <Th> Ranking 2011 </Th> <Th> Market share </Th> <Th> Solar module company </Th> <Th> Ranking </Th> <Th> Market share </Th> <Th> Country </Th> </Tr>

How many companies in the us manufacture solar panels