I purchase sukam pure sine wave on 12.02.2016.it has 3 years gurranty. but it has stopped working in the gurranty period. I complaint to the sukam service centre. they took it and said my inverter will returned to me in a week. but after three weeks gone they did not return my battery. I call the service centre but they did not give any response to me. whenever I call them they told me to came tomorrow but they did not return my inverter. I got my inverter back after 1 month. and still there is issue and lots of problem with it.