12 month ago I just buy a invertor of microtek . This is one of the product which is so costely acording to his durablity.The durability of the invertor is not good because the compeny of microtek were said about this product is long life approx 5 to 7 years but there is a problem just 12 month it gives lots of problem this is so noisey . There is also heating problem.I will used before 12 month but they give bad responce and also acording to his quality it was so costely and bad product of microtek ups