Excise limit for ssi unit

Jai (N.a) (24 Points)

10 February 2015  
hi I want to know what is the excise limit for SSI unit .. Till last year we have not crossed above 1.5 cr. But this year we are sure to cross this figure . after 1.5 cr do I have to give excise bill to my customer for sale of goods or any exemption I can get.