I have purchased Microtek Inverter in year 2008 from Khowa Mandi Gorakhpur and it is working til properly without creating any problem, when I purchased battery then I also purchase diffirent brand invertor but I did not find suitable backup after then I connected same battery with microtek inverter then I find better backup, so trusted that mircotek invertor is the best inverter, you can think that my invertor is working from 9 years withou any problem it is also proof of its best quality, I also like this inverter switch we can power on esily in night because in swich is big, and easy, and ther are fan in this inverter who make this life long there are ony one problem in this invertor Sound, they make sound while charging.