Dear Hello , This is Erica from CNBM ,which is established in 1984 with the approval from China State Council ,and we are a China state owned company ,one of Global fortune 500, we supply : Solar cells (Mono &Poly ) Solar panels ,¡]Mono&poly 10W---400W¡^traditional +half cut solar panels  solar system---outdoor portable solar system (eg, solar panel+battery +controller +DC fan +led light and so on ) We focus on long term cooperation ,not only focus on one order .and we always show products true quality clearly based on its price ,different price different quality ,we will tell all clearly in advance so that you can choose by yourself .  Nowdays ,in the market ,many suppliers mixed the expiry busbar and backsheet and even use broken solar cells pasted together to produce solar panels , althrough you coulnd't distinguish by eyes ,but its life time is really short which can destory your business too if you only fous on such low price and bad quality . at least for us ,I will tell you clearly of its quality , it just depends on your own choice . Hope we can get a chance to cooperate ,thanks . Erica Hu Sales Director CNBM xunpan@okorder.com Whatsapp: +8617190086776 WeChat :     Should you refuse to receive this service, click unsubscribe at any time.