The APC promises its customers two years onsite replacement warranty on both inverter and battery. However it fails to deliver on those aspects. I purchased a home inverter sine wave model BI800I. The product is still under warranty. The inverter fan is making a lot of noise when running and the battery is not giving any backup. Inspite of numerous call to their call center and fake promise that the problem would be rectified within 48 hours the problem is still unresolved for more than the last 15 days. It has been a harassment for getting the rightful customer service as stated by the company warranty policies.