I have had the Luminous inveter from 4 years and it has not given me much problem in this long time.We had to change its battery only once that too after 2 years.I love Luminous inverters and recommend to all.Its battery backup is awesome.Luminous servicing is awesome too its customer care is always active and they give the solutions to your problems ASAP.Anyone who wants to buy dont think twice.Its awesome.