Q1: Are you a factory or trade company? A: We are a factory who has more than 20 years experience in manufacturing; strong after sale service team and technical support. Q2: What's the MOQ? A: We have stock and semi-finished products with enough base materials for new sample and order for all models, So small quantity order is accepted, it can meet your requirement very well. Q3: Why others price much cheaper? We try our best to ensure our quality to be the best one in the same level price products. We believe safety and effectiveness are the most important. Q4: Can I have a sample for testing? Yes, you are welcome to test samples before quantity order; Sample order will be sent out 2- -3 days generally. Q5: Can I add my logo on the products? Yes,OEM and ODM are available for us. But you should send us the Trademark authorization letter. Q6: Do you have inspection procedures? 100% self-inspection before packing

Module Power (W)	560~580	555~570	620~635	680~700
Module Type	Radiance-560~580	Radiance-555~570	Radiance-620~635	Radiance-680~700
Module Efficiency	22.50%	22.10%	22.40%	22.50%
Module Size(mm)	2278×1134×30	2278×1134×30	2172×1303×33	2384×1303×33

The recombination of electrons and holes on the surface and any interface is the main factor limiting cell efficiency, and various passivation technologies have been developed to reduce the recombination, from early-stage BSF (Back Surface Field) to currently popular PERC (Passivated Emitter and Rear Cell), latest HJT (Heterojunction) and nowadays TOPCon technologies. TOPCon is an advanced passivation technology, which is compatible with both P-type and N-type silicon wafers and can greatly enhance cell efficiency by growing an ultra-thin oxide layer and a doped polysilicon layer on the back of the cell to create a good interfacial passivation. When combined with N-type silicon wafers, upper efficiency limit of TOPCon cells is estimated to be 28.7%, outclassing that of PERC, which would be about 24.5%. TOPCon's processing is more compatible to the existing PERC production lines, thus balancing better manufacturing cost and higher module efficiency. TOPCon is expected to be mainstream cell technology in the coming years.TOPCon modules enjoy better low-light performance. Improved low light performance is mainly related to the optimization of series resistance, leading to low saturation currents in TOPCon modules. Under low-light condition (200W/m²), performance of 210 TOPCon modules would be about 0.2% higher than 210 PERC modules.Modules’ operating temperature impacts their power output. Radiance TOPCon modules are based on N-type silicon wafers with high minority carrier lifetime and higher open-circuit voltage. The higher open-circuit voltage, the better module temperature coefficient. As a result, TOPCon modules would perform better than PERC modules when operating in high temperature environments.