I am using luminous inverter and UPS for the last seven years but till now I never faced any problem. This inverter works very efficiently for long hours. It is fully maintenance free and works silently. This company inverter and ups is very useful for house , office and shops. It is worth buying luminous inverter and ups. The battery comes with the product is so powerful that it can even support more appliances than specified. This inverter charge very quickly. It is truly a marathon performer.