i face a problem. i wanna buy a generator for my Store. but i Confucius whice one i will buy. if any one know any generator well for use pls tell me soon. it may really help me.
You would be better talking to local sellers in your part of Bangladesh. I'm not sure an internet marketing forum is the right place to source industrial machinery.
It appears that you are using google translate. This is an english speaking forum and google translate doesn't always do the best job translating, so your post is rather difficult to understand.
You really need to do as @sarahk suggests and get a professional involved, especially if this if for your business. For example, you need to know your peak wattage needs, your daily wattage needs, your building's power grid infrastructure, etc. Then you need someone who can select the correct solution for your needs and configuration. Here in the U.S., it is a bit tricky to hook up a generator to even just a house's grid and often an electrician is used for this.