No one in their right minds would consider buying APC inverters. I bought one in 2005, and its never worked three consecutive months. Even a local APC service center personnel admitted the numerous problems APC inverters have. Now its 3 months since I am awaiting change of batteries and perhaps the inverter itself. Imagine having bought the most expensive APC and spending the whole summer without its benefit. Its now lying dead in its corner. The company says it doesn't have batteries. This is a lie because the inverters are still available in the market and they can't be sold without batteries.