Exide invertor, we bought 4 years back worth of 17, 000. Yes price is high but the quality is also high and the services provided by the company are really good. Whenever we finish the liquid which is poured in it to work we call to the customer care , immediately they will come and provide services. Since 4 years we were using it, we didnt come across with any kind of problem. The functioning is really good and whenever power cuts immediately it will turn on with in 1 second. Most trusted and preferred.