In my house microtek digital inveter is installed with okaya battery. Microtek invertor is worst inverter I had ever seen in my when I was purchased this invertor microtek officials says it is the best in this price and having some unique features like surge protection over load protection etc etc. but after using this I have to bad product from microtek when main supply is off and home supply switch to invertor my room cfl start blinking and fan gives annoying noise when I complaint to microtek service centre to resolve this problem they send their engineer to repair this problem but after 5 days this problem occur again dont wo with model also the key to operate it is very small only 1 key is there for on and off which also doesn’t work after 3 months. worst product of my life.