I purchased a su-kam pure sine wave inverter two years ago after just 6 months it giving so much problem its give backup nearly 3-4 hrs and then called to the service team but they also come after 3-4 days , after that it works fine till its warranry period of one year then again giving me same type of problem I think company product as well as service both are not good I just say please don t buy su-kam for future purpose please go for some other inverter