1.Why choose XinDongke Solar? We established the business department and a warehouse which covers 6660 square meters in Fuyang, Zhejiang. Advanced technology, professional manufacture, and excellent quality. 100% A grade cells with ±3% power tolerance range. High module conversion efficiency, low module price Anti-reflective and high viscous EVA High light transmission Anti-reflective glass 10-12 years product warranty, 25 years limited power warranty. Strong productive ability and quick delivery. 2.What are your products lead time ? 10-15days fast delivery. 3.Do you have some cerfiticates ? Yes, we have ISO 9001, TUV nord for our Solar Glass, EVA film, Silicone sealant etc. 4.How can I get a sample for quality testing? We can provide some free small size samples for customers to make a testing. Sample shipping fees should be paid by customers. kindly notes. 5.What kind of solar glass can we choose? 1) Thickness available: 2.0/2.5/2.8/3.2/4.0/5.0mm solar glass for solar panels. 2) The glass used for BIPV / Greenhouse / Mirror etc. can be custom according to your request.Best Price & High Quality 5W 10W 15W 20W 30W 40W 45W 50w 80w 100w 120w 150w 180w 200w 250W 300W 310W 320W Poly or Mono Solar Panels From Dongke energy factory. -We are the solar panel & solar system manufacturer. -We have over 20 years experiences in the solar field,we are professional! -We own 4 factories which product solar panel and solar power system,and price is  competitive! -We can produce customized Solar system according to different customer's requirement, Our Company Annual capacity is more than 100000 sets. -The efficiency of solar panel is up to 20%. -The Module operating Temperature:-40°C to +80°C -Protection degree for junction box is IP65,and for plug connector(MC4) is IP67 -Our solar panel enjoys a good reputation in Southeast Asia, Middle East, Africa,and Australia countries such as  Morroco, India,Janpan,Pakistan,Nigeria,Dubai,Panama and so on.