I installed this inverter in my home , as my locality faces a lot of power cuts. While installation , the service person ensured me a backup of 4-5 hours on medium power load. However , this promise didn't prove to be true. Only one heater and three tube lights were connected at the time , still , the inverter turned off after 2 hours. I thought it to be a connection issue , but it was the battery that drained out. The inverter had been charged fully charged before the main power went out. Moreover for the review , the build quality of the product is good , and the led indicators work absolutely fine. The average charging time of this inverter is 14 hours. However , as mentioned above , the backup is poor.